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A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESSAstudillo-Defru, N.Cloutier, RyanWang, S. X.Teske, J.Brahm, R.Hellier, C.Ricker, G.Vanderspek, R.Latham, DavidSeager, S.Winn, J. N.Jenkins, J. M.Collins, Karen A.Stassun, K. G.Ziegler, C.Almenara, J. M.Anderson, D. R.Artigau, E.Bonfils, X.Bouchy, F.Briceño, C.Butler, R. P.Charbonneau, DavidConti, D. M.Crane, J.Crossfield, I. J. M.Davies, M.Delfosse, X.Díaz, R. F.Doyon, R.Dragomir, D.Eastman, Jason D.Espinoza, N.Essack, Z.Feng, F.Figueira, P.Forveille, T.Gan, T.Glidden, A.Guerrero, N.Hart, R.Henning, ThHorch, E. P.Isopi, G.Jenkins, J. S.Jordán, A.Kielkopf, J. F.Law, N.Lovis, C.Mallia, F.Mann, A. Medeiros, J. R.Melo, C.Mennickent, R. E.Mignon, L.Murgas, F.Nusdeo, D. A.Pepe, F.Relles, Howard M.Rose, M.Santos, N. C.Ségransan, D.Shectman, S.Shporer, A.Smith, J. C.Torres, P.Udry, S.Villasenor, J.Winters, Jennifer G.Zhou, GeorgeDOI: info:10.1051/0004-6361/201937179v. 636A58
Astudillo-Defru, N., Cloutier, Ryan, Wang, S. X., Teske, J., Brahm, R., Hellier, C., Ricker, G., Vanderspek, R., Latham, David, Seager, S., Winn, J. N., Jenkins, J. M., Collins, Karen A., Stassun, K. G., Ziegler, C., Almenara, J. M., Anderson, D. R., Artigau, E., Bonfils, X., Bouchy, F., Briceño, C., Butler, R. P., Charbonneau, David, Conti, D. M., Crane, J. et al. 2020. "A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS." Astronomy and Astrophysics 636:A58.
ID: 157118
Type: article
Authors: Astudillo-Defru, N.; Cloutier, Ryan; Wang, S. X.; Teske, J.; Brahm, R.; Hellier, C.; Ricker, G.; Vanderspek, R.; Latham, David; Seager, S.; Winn, J. N.; Jenkins, J. M.; Collins, Karen A.; Stassun, K. G.; Ziegler, C.; Almenara, J. M.; Anderson, D. R.; Artigau, E.; Bonfils, X.; Bouchy, F.; Briceño, C.; Butler, R. P.; Charbonneau, David; Conti, D. M.; Crane, J.; Crossfield, I. J. M.; Davies, M.; Delfosse, X.; Díaz, R. F.; Doyon, R.; Dragomir, D.; Eastman, Jason D.; Espinoza, N.; Essack, Z.; Feng, F.; Figueira, P.; Forveille, T.; Gan, T.; Glidden, A.; Guerrero, N.; Hart, R.; Henning, Th; Horch, E. P.; Isopi, G.; Jenkins, J. S.; Jordán, A.; Kielkopf, J. F.; Law, N.; Lovis, C.; Mallia, F.; Mann, A. W.; de Medeiros, J. R.; Melo, C.; Mennickent, R. E.; Mignon, L.; Murgas, F.; Nusdeo, D. A.; Pepe, F.; Relles, Howard M.; Rose, M.; Santos, N. C.; Ségransan, D.; Shectman, S.; Shporer, A.; Smith, J. C.; Torres, P.; Udry, S.; Villasenor, J.; Winters, Jennifer G.; Zhou, George
Abstract: We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass measurement purposes, this was followed up with ground-based photometry, seeing-limited and high-resolution imaging, and precise radial velocity (PRV) observations using the HARPS and Magellan/PFS spectrographs. By combining the TESS data and PRV observations, we find the mass of L 168-9 b to be 4.60 ± 0.56 M and thus the bulk density to be 1.74-0.33+0.44 times higher than that of the Earth. The orbital eccentricity is smaller than 0.21 (95% confidence). This planet is a level one candidate for the TESS mission's scientific objective of measuring the masses of 50 small planets, and it is one of the most observationally accessible terrestrial planets for future atmospheric characterization.
Full Tables B.1 and B.2 are only available at the CDS via anonymous ftp to ( or via bin/cat/J/A+A/636/A58.
Partially based on observations made with the HARPS instrument on the ESO 3.6 m telescope under the program IDs 198.C-0838(A), 0101.C-0510(C), and 1102.C-0339(A) at Cerro La Silla (Chile).
This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
A Pair of TESS Planets Spanning the Radius Valley around the Nearby Mid-M Dwarf LTT 3780Cloutier, RyanEastman, Jason D.Rodriguez, Joseph E.Astudillo-Defru, NicolaBonfils, XavierMortier, AnneliesWatson, Christopher A.Stalport, ManuPinamonti, MatteoLienhard, FlorianHarutyunyan, AvetDamasso, MarioLatham, David W.Collins, Karen A.Massey, RobertIrwin, JonathanWinters, Jennifer G.Charbonneau, DavidZiegler, CarlMatthews, ElisabethCrossfield, Ian J. M.Kreidberg, LauraQuinn, Samuel N.Ricker, GeorgeVanderspek, RolandSeager, SaraWinn, JoshuaJenkins, Jon M.Vezie, MichaelUdry, StéphaneTwicken, Joseph D.Tenenbaum, PeterSozzetti, AlessandroSégransan, DamienSchlieder, Joshua E.Sasselov, DimitarSantos, Nuno C.Rice, KenRackham, Benjamin V.Poretti, EnnioPiotto, GiampaoloPhillips, DavidPepe, FrancescoMolinari, EmilioMignon, LucileMicela, GiuseppinaMelo, Claudiode Medeiros, José R.Mayor, MichelMatson, Rachel A.Martinez Fiorenzano, Aldo F.Mann, Andrew W.Magazzú, AntonioLovis, ChristopheLópez-Morales, MercedesLopez, EricLissauer, Jack J.Lépine, SébastienLaw, NicholasKielkopf, John F.Johnson, John A.Jensen, Eric L. N.Howell, Steve B.Gonzales, EricaGhedina, AdrianoForveille, ThierryFigueira, PedroDumusque, XavierDressing, Courtney D.Doyon, RenéDíaz, Rodrigo F.Fabrizio, Luca DiDelfosse, XavierCosentino, RosarioConti, Dennis M.Collins, Kevin I.Cameron, Andrew CollierCiardi, DavidCaldwell, Douglas A.Burke, ChristopherBuchhave, LarsBriceño, CésarBoyd, PatriciaBouchy, FrançoisBeichman, CharlesArtigau, ÉtienneAlmenara, Jose M.DOI: info:10.3847/1538-3881/ab91c2v. 160No. 13
Cloutier, Ryan, Eastman, Jason D., Rodriguez, Joseph E., Astudillo-Defru, Nicola, Bonfils, Xavier, Mortier, Annelies, Watson, Christopher A., Stalport, Manu, Pinamonti, Matteo, Lienhard, Florian, Harutyunyan, Avet, Damasso, Mario, Latham, David W., Collins, Karen A., Massey, Robert, Irwin, Jonathan, Winters, Jennifer G., Charbonneau, David, Ziegler, Carl, Matthews, Elisabeth, Crossfield, Ian J. M., Kreidberg, Laura, Quinn, Samuel N., Ricker, George, Vanderspek, Roland et al. 2020. "A Pair of TESS Planets Spanning the Radius Valley around the Nearby Mid-M Dwarf LTT 3780." The Astronomical Journal 160 (1):3.
ID: 157584
Type: article
Authors: Cloutier, Ryan; Eastman, Jason D.; Rodriguez, Joseph E.; Astudillo-Defru, Nicola; Bonfils, Xavier; Mortier, Annelies; Watson, Christopher A.; Stalport, Manu; Pinamonti, Matteo; Lienhard, Florian; Harutyunyan, Avet; Damasso, Mario; Latham, David W.; Collins, Karen A.; Massey, Robert; Irwin, Jonathan; Winters, Jennifer G.; Charbonneau, David; Ziegler, Carl; Matthews, Elisabeth; Crossfield, Ian J. M.; Kreidberg, Laura; Quinn, Samuel N.; Ricker, George; Vanderspek, Roland; Seager, Sara; Winn, Joshua; Jenkins, Jon M.; Vezie, Michael; Udry, Stéphane; Twicken, Joseph D.; Tenenbaum, Peter; Sozzetti, Alessandro; Ségransan, Damien; Schlieder, Joshua E.; Sasselov, Dimitar; Santos, Nuno C.; Rice, Ken; Rackham, Benjamin V.; Poretti, Ennio; Piotto, Giampaolo; Phillips, David; Pepe, Francesco; Molinari, Emilio; Mignon, Lucile; Micela, Giuseppina; Melo, Claudio; de Medeiros, José R.; Mayor, Michel; Matson, Rachel A.; Martinez Fiorenzano, Aldo F.; Mann, Andrew W.; Magazzú, Antonio; Lovis, Christophe; López-Morales, Mercedes; Lopez, Eric; Lissauer, Jack J.; Lépine, Sébastien; Law, Nicholas; Kielkopf, John F.; Johnson, John A.; Jensen, Eric L. N.; Howell, Steve B.; Gonzales, Erica; Ghedina, Adriano; Forveille, Thierry; Figueira, Pedro; Dumusque, Xavier; Dressing, Courtney D.; Doyon, René; Díaz, Rodrigo F.; Fabrizio, Luca Di; Delfosse, Xavier; Cosentino, Rosario; Conti, Dennis M.; Collins, Kevin I.; Cameron, Andrew Collier; Ciardi, David; Caldwell, Douglas A.; Burke, Christopher; Buchhave, Lars; Briceño, César; Boyd, Patricia; Bouchy, François; Beichman, Charles; Artigau, Étienne; Almenara, Jose M.
Abstract: We present the confirmation of two new planets transiting the nearby mid-M dwarf LTT 3780 (TIC 36724087, TOI-732, V = 13.07, Ks = 8.204, Rs = 0.374 R, Ms = 0.401 M, d = 22 pc). The two planet candidates are identified in a single Transiting Exoplanet Survey Satellite sector and validated with reconnaissance spectroscopy, ground-based photometric follow-up, and high-resolution imaging. With measured orbital periods of Pb = 0.77, Pc = 12.25 days and sizes rp,b = 1.33 ± 0.07, rp,c = 2.30 ± 0.16 R, the two planets span the radius valley in period-radius space around low-mass stars, thus making the system a laboratory to test competing theories of the emergence of the radius valley in that stellar mass regime. By combining 63 precise radial velocity measurements from the High Accuracy Radial velocity Planet Searcher (HARPS) and HARPS-N, we measure planet masses of ${m}_{p,b}={2.62}_{-0.46}^{+0.48}$ and ${m}_{p,c}={8.6}_{-1.3}^{+1.6}$ M, which indicates that LTT 3780b has a bulk composition consistent with being Earth-like, while LTT 3780c likely hosts an extended H/He envelope. We show that the recovered planetary masses are consistent with predictions from both photoevaporation and core-powered mass-loss models. The brightness and small size of LTT 3780, along with the measured planetary parameters, render LTT 3780b and c as accessible targets for atmospheric characterization of planets within the same planetary system and spanning the radius valley.
TOI-1235 b: A Keystone Super-Earth for Testing Radius Valley Emergence Models around Early M DwarfsCloutier, RyanRodriguez, Joseph E.Irwin, JonathanCharbonneau, DavidStassun, Keivan G.Mortier, AnneliesLatham, David W.Isaacson, HowardHoward, Andrew W.Udry, StéphaneWilson, Thomas G.Watson, Christopher A.Pinamonti, MatteoLienhard, FlorianGiacobbe, PaoloGuerra, PereCollins, Karen A.Beiryla, AllysonEsquerdo, Gilbert A.Matthews, ElisabethMatson, Rachel A.Howell, Steve B.Furlan, EliseCrossfield, Ian J. M.Winters, Jennifer G.Nava, ChantanelleMent, KristoLopez, Eric D.Ricker, GeorgeVanderspek, RolandSeager, SaraJenkins, Jon M.Ting, Eric B.Tenenbaum, PeterSozzetti, AlessandroSha, LizhouSégransan, DamienSchlieder, Joshua E.Sasselov, DimitarRoy, ArpitaRobertson, PaulRice, KenPoretti, EnnioPiotto, GiampaoloPhillips, DavidPepper, JoshuaPepe, FrancescoMolinari, EmilioMocnik, TeoMicela, GiuseppinaMayor, MichelMartinez Fiorenzano, Aldo F.Mallia, FrancoLubin, JackLovis, ChristopheLópez-Morales, MercedesKosiarek, Molly R.Kielkopf, John F.Kane, Stephen R.Jensen, Eric L. N.Isopi, GiovanniHuber, DanielHill, Michelle L.Harutyunyan, AvetGonzales, EricaGiacalone, StevenGhedina, AdrianoErcolino, AndreaDumusque, XavierDressing, Courtney D.Damasso, MarioDalba, Paul A.Cosentino, RosarioConti, Dennis M.Colón, Knicole D.Collins, Kevin I.Cameron, Andrew CollierCiardi, DavidChristiansen, JessieChontos, AshleyCecconi, MassimoCaldwell, Douglas A.Burke, ChristopherBuchhave, LarsBeichman, CharlesBehmard, AidaBeard, CoreyAkana Murphy, Joseph M.DOI: info:10.3847/1538-3881/ab9534v. 160No. 122
Cloutier, Ryan, Rodriguez, Joseph E., Irwin, Jonathan, Charbonneau, David, Stassun, Keivan G., Mortier, Annelies, Latham, David W., Isaacson, Howard, Howard, Andrew W., Udry, Stéphane, Wilson, Thomas G., Watson, Christopher A., Pinamonti, Matteo, Lienhard, Florian, Giacobbe, Paolo, Guerra, Pere, Collins, Karen A., Beiryla, Allyson, Esquerdo, Gilbert A., Matthews, Elisabeth, Matson, Rachel A., Howell, Steve B., Furlan, Elise, Crossfield, Ian J. M., Winters, Jennifer G. et al. 2020. "TOI-1235 b: A Keystone Super-Earth for Testing Radius Valley Emergence Models around Early M Dwarfs." The Astronomical Journal 160 (1):22.
ID: 157585
Type: article
Authors: Cloutier, Ryan; Rodriguez, Joseph E.; Irwin, Jonathan; Charbonneau, David; Stassun, Keivan G.; Mortier, Annelies; Latham, David W.; Isaacson, Howard; Howard, Andrew W.; Udry, Stéphane; Wilson, Thomas G.; Watson, Christopher A.; Pinamonti, Matteo; Lienhard, Florian; Giacobbe, Paolo; Guerra, Pere; Collins, Karen A.; Beiryla, Allyson; Esquerdo, Gilbert A.; Matthews, Elisabeth; Matson, Rachel A.; Howell, Steve B.; Furlan, Elise; Crossfield, Ian J. M.; Winters, Jennifer G.; Nava, Chantanelle; Ment, Kristo; Lopez, Eric D.; Ricker, George; Vanderspek, Roland; Seager, Sara; Jenkins, Jon M.; Ting, Eric B.; Tenenbaum, Peter; Sozzetti, Alessandro; Sha, Lizhou; Ségransan, Damien; Schlieder, Joshua E.; Sasselov, Dimitar; Roy, Arpita; Robertson, Paul; Rice, Ken; Poretti, Ennio; Piotto, Giampaolo; Phillips, David; Pepper, Joshua; Pepe, Francesco; Molinari, Emilio; Mocnik, Teo; Micela, Giuseppina; Mayor, Michel; Martinez Fiorenzano, Aldo F.; Mallia, Franco; Lubin, Jack; Lovis, Christophe; López-Morales, Mercedes; Kosiarek, Molly R.; Kielkopf, John F.; Kane, Stephen R.; Jensen, Eric L. N.; Isopi, Giovanni; Huber, Daniel; Hill, Michelle L.; Harutyunyan, Avet; Gonzales, Erica; Giacalone, Steven; Ghedina, Adriano; Ercolino, Andrea; Dumusque, Xavier; Dressing, Courtney D.; Damasso, Mario; Dalba, Paul A.; Cosentino, Rosario; Conti, Dennis M.; Colón, Knicole D.; Collins, Kevin I.; Cameron, Andrew Collier; Ciardi, David; Christiansen, Jessie; Chontos, Ashley; Cecconi, Massimo; Caldwell, Douglas A.; Burke, Christopher; Buchhave, Lars; Beichman, Charles; Behmard, Aida; Beard, Corey; Akana Murphy, Joseph M.
Abstract: Small planets on close-in orbits tend to exhibit envelope mass fractions of either effectively zero or up to a few percent depending on their size and orbital period. Models of thermally driven atmospheric mass loss and of terrestrial planet formation in a gas-poor environment make distinct predictions regarding the location of this rocky/nonrocky transition in period-radius space. Here we present the confirmation of TOI-1235 b (P = 3.44 days, ${r}_{{\rm{p}}}={1.738}_{-0.076}^{+0.087}$ ${R}_{\oplus }$ ), a planet whose size and period are intermediate between the competing model predictions, thus making the system an important test case for emergence models of the rocky/nonrocky transition around early M dwarfs (Rs = 0.630 ± 0.015 ${R}_{\odot }$ , Ms = 0.640 ± 0.016 ${M}_{\odot }$ ). We confirm the TESS planet discovery using reconnaissance spectroscopy, ground-based photometry, high-resolution imaging, and a set of 38 precise radial velocities (RVs) from HARPS-N and HIRES. We measure a planet mass of ${6.91}_{-0.85}^{+0.75}$ ${M}_{\oplus }$ , which implies an iron core mass fraction of ${20}_{-12}^{+15}$ % in the absence of a gaseous envelope. The bulk composition of TOI-1235 b is therefore consistent with being Earth-like, and we constrain an H/He envelope mass fraction to be <0.5% at 90% confidence. Our results are consistent with model predictions from thermally driven atmospheric mass loss but not with gas-poor formation, suggesting that the former class of processes remains efficient at sculpting close-in planets around early M dwarfs. Our RV analysis also reveals a strong periodicity close to the first harmonic of the photometrically determined stellar rotation period that we treat as stellar activity, despite other lines of evidence favoring a planetary origin ( $P={21.8}_{-0.8}^{+0.9}$ days, ${m}_{{\rm{p}}}\sin i={13.0}_{-5.3}^{+3.8}$ ${M}_{\oplus }$ ) that cannot be firmly ruled out by our data.
LHS 1815b: The First Thick-disk Planet Detected by TESSGan, TianjunShporer, AviLivingston, John H.Collins, Karen A.Mao, ShudeTrani, Alessandro A.Gandolfi, DavideHirano, TeruyukiLuque, RafaelStassun, Keivan G.Ziegler, CarlHowell, Steve B.Hellier, CoelIrwin, Jonathan M.Winters, Jennifer G.Anderson, David R.Briceño, CésarLaw, NicholasMann, Andrew W.Bonfils, XavierAstudillo-Defru, NicolaJensen, Eric L. N.Anglada-Escudé, GuillemRicker, George R.Vanderspek, RolandLatham, David W.Seager, SaraWinn, Joshua N.Jenkins, Jon M.Furesz, GaborGuerrero, Natalia M.Quintana, ElisaTwicken, Joseph D.Caldwell, Douglas A.Tenenbaum, PeterHuang, Chelsea X.Rowden, PamelaRojas-Ayala, BárbaraDOI: info:10.3847/1538-3881/ab775av. 159160
Gan, Tianjun, Shporer, Avi, Livingston, John H., Collins, Karen A., Mao, Shude, Trani, Alessandro A., Gandolfi, Davide, Hirano, Teruyuki, Luque, Rafael, Stassun, Keivan G., Ziegler, Carl, Howell, Steve B., Hellier, Coel, Irwin, Jonathan M., Winters, Jennifer G., Anderson, David R., Briceño, César, Law, Nicholas, Mann, Andrew W., Bonfils, Xavier, Astudillo-Defru, Nicola, Jensen, Eric L. N., Anglada-Escudé, Guillem, Ricker, George R., Vanderspek, Roland et al. 2020. "LHS 1815b: The First Thick-disk Planet Detected by TESS." The Astronomical Journal 159:160.
ID: 156330
Type: article
Authors: Gan, Tianjun; Shporer, Avi; Livingston, John H.; Collins, Karen A.; Mao, Shude; Trani, Alessandro A.; Gandolfi, Davide; Hirano, Teruyuki; Luque, Rafael; Stassun, Keivan G.; Ziegler, Carl; Howell, Steve B.; Hellier, Coel; Irwin, Jonathan M.; Winters, Jennifer G.; Anderson, David R.; Briceño, César; Law, Nicholas; Mann, Andrew W.; Bonfils, Xavier; Astudillo-Defru, Nicola; Jensen, Eric L. N.; Anglada-Escudé, Guillem; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Furesz, Gabor; Guerrero, Natalia M.; Quintana, Elisa; Twicken, Joseph D.; Caldwell, Douglas A.; Tenenbaum, Peter; Huang, Chelsea X.; Rowden, Pamela; Rojas-Ayala, Bárbara
Abstract: We report the first discovery of a thick-disk planet, LHS 1815b (TOI- 704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf located 29.87 ± 0.02 pc away with a mass of 0.502 ± 0.015 M and a radius of 0.501 ± 0.030 R. We validate the planet by combining space- and ground-based photometry, spectroscopy, and imaging. The planet has a radius of 1.088 ± 0.064 R with a 3σ mass upper limit of 8.7 M. We analyze the galactic kinematics and orbit of the host star LHS 1815 and find that it has a large probability (Pthick/Pthin = 6482) to be in the thick disk with a much higher expected maximal height (Zmax = 1.8 kpc) above the Galactic plane compared with other TESS planet host stars. Future studies of the interior structure and atmospheric properties of planets in such systems using, for example, the upcoming James Webb Space Telescope, can investigate the differences in formation efficiency and evolution for planetary systems between different Galactic components (thick disks, thin disks, and halo).
The First Habitable-zone Earth-sized Planet from TESS. I. Validation of the TOI-700 SystemGilbert, Emily A.Barclay, ThomasSchlieder, Joshua E.Quintana, Elisa V.Hord, Benjamin J.Kostov, Veselin B.Lopez, Eric D.Rowe, Jason F.Hoffman, KelseyWalkowicz, Lucianne M.Silverstein, Michele L.Rodriguez, Joseph E.Vanderburg, AndrewSuissa, GabrielleAirapetian, Vladimir S.Clement, Matthew S.Raymond, Sean N.Mann, Andrew W.Kruse, EthanLissauer, Jack J.Colón, Knicole D.Kopparapu, Ravi KumarKreidberg, LauraZieba, SebastianCollins, Karen A.Quinn, Samuel N.Howell, Steve B.Ziegler, CarlVrijmoet, Eliot HalleyAdams, Fred C.Arney, Giada N.Boyd, Patricia T.Brande, JonathanBurke, Christopher J.Cacciapuoti, LucaChance, QuadryChristiansen, Jessie L.Covone, GiovanniDaylan, TansuDineen, DanielleDressing, Courtney D.Essack, ZahraFauchez, Thomas J.Galgano, BriannaHowe, Alex R.Kaltenegger, LisaKane, Stephen R.Lam, ChristopherLee, Eve J.Lewis, Nikole K.Logsdon, Sarah E.Mandell, Avi M.Monsue, TeresaMullally, FergalMullally, Susan E.Paudel, Rishi R.Pidhorodetska, DariaPlavchan, PeterReyes, Naylynn TañónRinehart, Stephen A.Rojas-Ayala, BárbaraSmith, Jeffrey C.Stassun, Keivan G.Tenenbaum, PeterVega, Laura D.Villanueva, Geronimo L.Wolf, Eric T.Youngblood, AllisonRicker, George R.Vanderspek, Roland K.Latham, David W.Seager, SaraWinn, Joshua N.Jenkins, Jon M.Bakos, Gáspár Å.Briceño, CésarCiardi, David R.Cloutier, RyanConti, Dennis M.Couperus, AndrewDi Sora, MarioEisner, Nora L.Everett, Mark E.Gan, TianjunHartman, Joel D.Henry, ToddIsopi, GiovanniJao, Wei-ChunJensen, Eric L. N.Law, NicholasMallia, FrancoMatson, Rachel A.Shappee, Benjamin J.Le Wood, MackennaeWinters, Jennifer G.DOI: info:10.3847/1538-3881/aba4b2v. 160116
Gilbert, Emily A., Barclay, Thomas, Schlieder, Joshua E., Quintana, Elisa V., Hord, Benjamin J., Kostov, Veselin B., Lopez, Eric D., Rowe, Jason F., Hoffman, Kelsey, Walkowicz, Lucianne M., Silverstein, Michele L., Rodriguez, Joseph E., Vanderburg, Andrew, Suissa, Gabrielle, Airapetian, Vladimir S., Clement, Matthew S., Raymond, Sean N., Mann, Andrew W., Kruse, Ethan, Lissauer, Jack J., Colón, Knicole D., Kopparapu, Ravi Kumar, Kreidberg, Laura, Zieba, Sebastian, Collins, Karen A. et al. 2020. "The First Habitable-zone Earth-sized Planet from TESS. I. Validation of the TOI-700 System." The Astronomical Journal 160:116.
ID: 157602
Type: article
Authors: Gilbert, Emily A.; Barclay, Thomas; Schlieder, Joshua E.; Quintana, Elisa V.; Hord, Benjamin J.; Kostov, Veselin B.; Lopez, Eric D.; Rowe, Jason F.; Hoffman, Kelsey; Walkowicz, Lucianne M.; Silverstein, Michele L.; Rodriguez, Joseph E.; Vanderburg, Andrew; Suissa, Gabrielle; Airapetian, Vladimir S.; Clement, Matthew S.; Raymond, Sean N.; Mann, Andrew W.; Kruse, Ethan; Lissauer, Jack J.; Colón, Knicole D.; Kopparapu, Ravi Kumar; Kreidberg, Laura; Zieba, Sebastian; Collins, Karen A.; Quinn, Samuel N.; Howell, Steve B.; Ziegler, Carl; Vrijmoet, Eliot Halley; Adams, Fred C.; Arney, Giada N.; Boyd, Patricia T.; Brande, Jonathan; Burke, Christopher J.; Cacciapuoti, Luca; Chance, Quadry; Christiansen, Jessie L.; Covone, Giovanni; Daylan, Tansu; Dineen, Danielle; Dressing, Courtney D.; Essack, Zahra; Fauchez, Thomas J.; Galgano, Brianna; Howe, Alex R.; Kaltenegger, Lisa; Kane, Stephen R.; Lam, Christopher; Lee, Eve J.; Lewis, Nikole K.; Logsdon, Sarah E.; Mandell, Avi M.; Monsue, Teresa; Mullally, Fergal; Mullally, Susan E.; Paudel, Rishi R.; Pidhorodetska, Daria; Plavchan, Peter; Reyes, Naylynn Tañón; Rinehart, Stephen A.; Rojas-Ayala, Bárbara; Smith, Jeffrey C.; Stassun, Keivan G.; Tenenbaum, Peter; Vega, Laura D.; Villanueva, Geronimo L.; Wolf, Eric T.; Youngblood, Allison; Ricker, George R.; Vanderspek, Roland K.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Bakos, Gáspár Å.; Briceño, César; Ciardi, David R.; Cloutier, Ryan; Conti, Dennis M.; Couperus, Andrew; Di Sora, Mario; Eisner, Nora L.; Everett, Mark E.; Gan, Tianjun; Hartman, Joel D.; Henry, Todd; Isopi, Giovanni; Jao, Wei-Chun; Jensen, Eric L. N.; Law, Nicholas; Mallia, Franco; Matson, Rachel A.; Shappee, Benjamin J.; Le Wood, Mackennae; Winters, Jennifer G.
Abstract: We present the discovery and validation of a three-planet system orbiting the nearby (31.1 pc) M2 dwarf star TOI-700 (TIC 150428135). TOI-700 lies in the TESS continuous viewing zone in the Southern Ecliptic Hemisphere; observations spanning 11 sectors reveal three planets with radii ranging from 1 R to 2.6 R and orbital periods ranging from 9.98 to 37.43 days. Ground-based follow-up combined with diagnostic vetting and validation tests enables us to rule out common astrophysical false-positive scenarios and validate the system of planets. The outermost planet, TOI-700 d, has a radius of 1.19 ± 0.11 R and resides within a conservative estimate of the host star's habitable zone, where it receives a flux from its star that is approximately 86% of Earth's insolation. In contrast to some other low-mass stars that host Earth-sized planets in their habitable zones, TOI-700 exhibits low levels of stellar activity, presenting a valuable opportunity to study potentially rocky planets over a wide range of conditions affecting atmospheric escape. While atmospheric characterization of TOI-700 d with the James Webb Space Telescope (JWST) will be challenging, the larger sub-Neptune, TOI-700 c (R = 2.63 R), will be an excellent target for JWST and future space-based observatories. TESS is scheduled to once again observe the Southern Hemisphere, and it will monitor TOI-700 for an additional 11 sectors in its extended mission. These observations should allow further constraints on the known planet parameters and searches for additional planets and transit timing variations in the system.
The Young Planetary System K2-25: Constraints on Companions and StarspotsKain, Isabel J.Newton, Elisabeth R.Dittmann, Jason A.Irwin, Jonathan M.Mann, Andrew W.Thao, Pa ChiaCharbonneau, DavidWinters, Jennifer G.DOI: info:10.3847/1538-3881/ab655bv. 15983
Kain, Isabel J., Newton, Elisabeth R., Dittmann, Jason A., Irwin, Jonathan M., Mann, Andrew W., Thao, Pa Chia, Charbonneau, David, and Winters, Jennifer G. 2020. "The Young Planetary System K2-25: Constraints on Companions and Starspots." The Astronomical Journal 159:83.
ID: 156364
Type: article
Authors: Kain, Isabel J.; Newton, Elisabeth R.; Dittmann, Jason A.; Irwin, Jonathan M.; Mann, Andrew W.; Thao, Pa Chia; Charbonneau, David; Winters, Jennifer G.
Abstract: The abundance of planets with orbital periods of a few to tens of days suggests that exoplanets experience complex dynamical histories. Planets in young stellar clusters or associations have well-constrained ages and therefore provide an opportunity to explore the dynamical evolution of exoplanets. K2-25b is a Neptune-sized planet in an eccentric, 3.48 day orbit around an M4.5 dwarf star in the Hyades cluster (650 Myr). In order to investigate its non-zero eccentricity and tight orbit, we analyze transit timing variations (TTVs) which could reveal clues to the migration processes that may have acted on the planet. We obtain 12 nonconsecutive transits using the MEarth observatories and long-term photometric monitoring, which we combine with 10 transits from the Spitzer Space Telescope and 20 transits from K2. Tables of MEarth photometry accompany this work. We fit each transit lightcurve independently. We first investigate whether inhomogeneities on the stellar surface (such as spots or plages) are differentially affecting our transit observations. The measured transit depth does not vary significantly between transits, though we see some deviations from the fiducial transit model. We then looked for TTVs as evidence of a nontransiting perturber in the system. We find no evidence for >1 M mass companions within a 2:1 period ratio, or for >5 M mass planets within a 7:2 period ratio.
Robo-AO M-dwarf Multiplicity Survey: CatalogLamman, ClaireBaranec, ChristophBerta-Thompson, Zachory K.Law, Nicholas M.Schonhut-Stasik, JessicaZiegler, CarlSalama, MaïssaJensen-Clem, RebeccaDuev, Dmitry A.Riddle, ReedKulkarni, Shrinivas R.Winters, Jennifer G.Irwin, Jonathan M.DOI: info:10.3847/1538-3881/ab6ef1v. 159139
Lamman, Claire, Baranec, Christoph, Berta-Thompson, Zachory K., Law, Nicholas M., Schonhut-Stasik, Jessica, Ziegler, Carl, Salama, Maïssa, Jensen-Clem, Rebecca, Duev, Dmitry A., Riddle, Reed, Kulkarni, Shrinivas R., Winters, Jennifer G., and Irwin, Jonathan M. 2020. "Robo-AO M-dwarf Multiplicity Survey: Catalog." The Astronomical Journal 159:139.
ID: 156325
Type: article
Authors: Lamman, Claire; Baranec, Christoph; Berta-Thompson, Zachory K.; Law, Nicholas M.; Schonhut-Stasik, Jessica; Ziegler, Carl; Salama, Maïssa; Jensen-Clem, Rebecca; Duev, Dmitry A.; Riddle, Reed; Kulkarni, Shrinivas R.; Winters, Jennifer G.; Irwin, Jonathan M.
Abstract: We analyze observations from Robo-AO's field M dwarf survey taken on the 2.1 m Kitt Peak telescope and perform a multiplicity comparison with Gaia DR2. Through its laser-guided, automated system, the Robo-AO instrument has yielded the largest adaptive optics M dwarf multiplicity survey to date. After developing an interface to visually identify and locate stellar companions, we selected 11 low-significance Robo-AO detections for follow-up on the Keck II telescope using NIRC2. In the Robo-AO survey we find 553 candidate companions within 4″ around 534 stars out of 5566 unique targets, most of which are new discoveries. Using a position cross-match with DR2 on all targets, we assess the binary recoverability of Gaia DR2 and compare the properties of multiples resolved by both Robo-AO and Gaia. The catalog of nearby M dwarf systems and their basic properties presented here can assist other surveys which observe these stars, such as the NASA TESS mission.
Flare Rates, Rotation Periods, and Spectroscopic Activity Indicators of a Volume-complete Sample of Mid- to Late-M Dwarfs within 15 pcMedina, Amber A.Winters, Jennifer G.Irwin, Jonathan M.Charbonneau, DavidDOI: info:10.3847/1538-4357/abc686v. 905107
Medina, Amber A., Winters, Jennifer G., Irwin, Jonathan M., and Charbonneau, David. 2020. "Flare Rates, Rotation Periods, and Spectroscopic Activity Indicators of a Volume-complete Sample of Mid- to Late-M Dwarfs within 15 pc." The Astrophysical Journal 905:107.
ID: 158738
Type: article
Authors: Medina, Amber A.; Winters, Jennifer G.; Irwin, Jonathan M.; Charbonneau, David
Abstract: We present a study of flare rates, rotation periods, and spectroscopic activity indicators of 125 single stars within 15 parsecs and with masses between 0.1 and 0.3 M? observed during the first year of the TESS mission, with the goal of elucidating the relationship between these various magnetically connected phenomena. We gathered multiepoch high-resolution spectra of each target, and we measured equivalent widths of the activity indicators helium I D3, Ha, and the calcium infrared triplet line at 8542.09 Å. We present 18 new rotation periods from MEarth photometry and 19 new rotation periods from TESS photometry. We present a catalog of 1392 flares. After correcting for sensitivity, we find the slope of the flare frequency distribution for all stars to have a standard value of a = 1.98 ± 0.02. We determine R31.5, the rate of flares per day with energies above E = 3.16 × 1031 ergs in the TESS bandpass. We find that below a critical value of Ha EW = -0.71 Å, log R31.5 increases linearly with increasing Ha emission; above this value, log R31.5 declines rapidly. The stars divide into two groups: 26% have Ha in emission, high flare rates with typical values of log R31.5 = -1.30 ± 0.08, and have Rossby numbers = -1.30 ± 0.08, and have Rossby numbers 31.5 < -3.86, with the majority of these stars not showing a single flare during the TESS observations.
GJ 1252 b: A 1.2 R⊕ Planet Transiting an M3 Dwarf at 20.4 pcShporer, AviCollins, Karen A.Astudillo-Defru, NicolaIrwin, JonathanBonfils, XavierCollins, Kevin I.Matthews, ElisabethWinters, Jennifer G.Anderson, David R.Armstrong, James D.Charbonneau, DavidCloutier, RyanDaylan, TansuGan, TianjunGünther, Maximilian N.Hellier, CoelHorne, KeithHuang, Chelsea X.Jensen, Eric L. N.Kielkopf, JohnPalle, EnricSefako, RamotholoStassun, Keivan G.Tan, Thiam-GuanVanderburg, AndrewRicker, George R.Latham, David W.Vanderspek, RolandSeager, SaraWinn, Joshua N.Jenkins, Jon M.Colon, KnicoleDressing, Courtney D.Léepine, SébastienMuirhead, Philip S.Rose, Mark E.Twicken, Joseph D.Villasenor, Jesus NoelDOI: info:10.3847/2041-8213/ab7020v. 890L7
Shporer, Avi, Collins, Karen A., Astudillo-Defru, Nicola, Irwin, Jonathan, Bonfils, Xavier, Collins, Kevin I., Matthews, Elisabeth, Winters, Jennifer G., Anderson, David R., Armstrong, James D., Charbonneau, David, Cloutier, Ryan, Daylan, Tansu, Gan, Tianjun, Günther, Maximilian N., Hellier, Coel, Horne, Keith, Huang, Chelsea X., Jensen, Eric L. N., Kielkopf, John, Palle, Enric, Sefako, Ramotholo, Stassun, Keivan G., Tan, Thiam-Guan, Vanderburg, Andrew et al. 2020. "GJ 1252 b: A 1.2 R Planet Transiting an M3 Dwarf at 20.4 pc." The Astrophysical Journal 890:L7.
ID: 156226
Type: article
Authors: Shporer, Avi; Collins, Karen A.; Astudillo-Defru, Nicola; Irwin, Jonathan; Bonfils, Xavier; Collins, Kevin I.; Matthews, Elisabeth; Winters, Jennifer G.; Anderson, David R.; Armstrong, James D.; Charbonneau, David; Cloutier, Ryan; Daylan, Tansu; Gan, Tianjun; Günther, Maximilian N.; Hellier, Coel; Horne, Keith; Huang, Chelsea X.; Jensen, Eric L. N.; Kielkopf, John; Palle, Enric; Sefako, Ramotholo; Stassun, Keivan G.; Tan, Thiam-Guan; Vanderburg, Andrew; Ricker, George R.; Latham, David W.; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Colon, Knicole; Dressing, Courtney D.; Léepine, Sébastien; Muirhead, Philip S.; Rose, Mark E.; Twicken, Joseph D.; Villasenor, Jesus Noel
Abstract: We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 ${R}_{\oplus }$ and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 ${M}_{\odot }$ , 0.391 ± 0.020 ${R}_{\odot }$ ) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TESS) data, ground-based photometry and spectroscopy, Gaia astrometry, and high angular resolution imaging to show that the transit signal seen in the TESS data must originate from a transiting planet. We do so by ruling out all false-positive scenarios that attempt to explain the transit signal as originating from an eclipsing stellar binary. Precise Doppler monitoring also leads to a tentative mass measurement of 2.09 ± 0.56 M. The host star proximity, brightness (V = 12.19 mag, K = 7.92 mag), low stellar activity, and the system's short orbital period make this planet an attractive target for detailed characterization, including precise mass measurement, looking for other objects in the system, and planet atmosphere characterization.
Spectroscopic Orbits of 11 Nearby, Mid-to-late M-dwarf BinariesWinters, Jennifer G.Irwin, Jonathan M.Charbonneau, DavidLatham, David W.Medina, Amber M.Mink, JessicaEsquerdo, Gilbert A.Berlind, PerryCalkins, Michael L.Berta-Thompson, Zachory K.DOI: info:10.3847/1538-3881/ab8d31v. 159290
Winters, Jennifer G., Irwin, Jonathan M., Charbonneau, David, Latham, David W., Medina, Amber M., Mink, Jessica, Esquerdo, Gilbert A., Berlind, Perry, Calkins, Michael L., and Berta-Thompson, Zachory K. 2020. "Spectroscopic Orbits of 11 Nearby, Mid-to-late M-dwarf Binaries." The Astronomical Journal 159:290.
ID: 156878
Type: article
Authors: Winters, Jennifer G.; Irwin, Jonathan M.; Charbonneau, David; Latham, David W.; Medina, Amber M.; Mink, Jessica; Esquerdo, Gilbert A.; Berlind, Perry; Calkins, Michael L.; Berta-Thompson, Zachory K.
Abstract: We present the spectroscopic orbits of 11 nearby, mid-to-late M dwarf binary systems in a variety of configurations: 2 single-lined binaries (SB1s), 7 double-lined binaries (SB2s), 1 double-lined triple (ST2), and 1 triple-lined triple (ST3). Eight of these orbits are the first published for these systems, while five are newly identified multiples. We obtained multi-epoch, high-resolution spectra with the TRES instrument on the 1.5 m Tillinghast Reflector at the Fred Lawrence Whipple Observatory located on Mt. Hopkins in AZ. Using the TiO molecular bands at 7065-7165 Å, we calculated radial velocities for these systems, from which we derived their orbits. We find LHS 1817 to have in a 7 hr period a companion that is likely a white dwarf, due to the ellipsoidal modulation we see in our MEarth-North light-curve data. We find G 123-45 and LTT 11586 to host companions with minimum masses of 41 MJup and 44 MJup with orbital periods of 35 and 15 days, respectively. We find 2MA 0930+0227 to have a rapidly rotating stellar companion in a 917 day orbital period. GJ 268, GJ 1029, LP 734-34, GJ 1182, G 258-17, and LTT 7077are SB2s with stellar companions with orbital periods of 10, 96, 34, 154, 5, and 84 days; LP 655-43 is an ST3 with one companion in an 18 day orbital period and an outer component in a longer undetermined period. In addition, we present radial velocities for both components of L 870-44AB and for the outer components of LTT 11586 and LP 655-43.
A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18Crossfield, Ian J. M.Waalkes, WilliamNewton, Elisabeth R.Narita, NorioMuirhead, PhilipMent, KristoMatthews, ElisabethKraus, AdamKostov, VeselinKosiarek, Molly R.Kane, Stephen R.Isaacson, HowardHalverson, SamGonzales, EricaEverett, MarkDragomir, DianaCollins, Karen A.Chontos, AshleyBerardo, DavidWinters, Jennifer G.Winn, Joshua N.Scott, Nicholas J.Rojas-Ayala, BarbaraRizzuto, Aaron C.Petigura, Erik A.Peterson, MerrinMocnik, TeoMikal-Evans, ThomasMehrle, NicholasMatson, RachelKuzuhara, MasayukiIrwin, JonathanHuber, DanielHuang, ChelseaHowell, SteveHoward, Andrew W.Hirano, TeruyukiFulton, Benjamin J.Dupuy, TrentDressing, Courtney D.Dalba, Paul A.Charbonneau, DavidBurt, JenniferBerta-Thompson, ZachoryBenneke, BjörnWatanabe, NoriharuTwicken, Joseph D.Tamura, MotohideSchlieder, JoshuaSeager, S.Rose, Mark E.Ricker, GeorgeQuintana, ElisaLépine, SébastienLatham, David W.Kotani, TakayukiJenkins, Jon M.Hori, YasunoriColon, KnicoleCaldwell, Douglas A.DOI: info:10.3847/2041-8213/ab3d30v. 883L16
Crossfield, Ian J. M., Waalkes, William, Newton, Elisabeth R., Narita, Norio, Muirhead, Philip, Ment, Kristo, Matthews, Elisabeth, Kraus, Adam, Kostov, Veselin, Kosiarek, Molly R., Kane, Stephen R., Isaacson, Howard, Halverson, Sam, Gonzales, Erica, Everett, Mark, Dragomir, Diana, Collins, Karen A., Chontos, Ashley, Berardo, David, Winters, Jennifer G., Winn, Joshua N., Scott, Nicholas J., Rojas-Ayala, Barbara, Rizzuto, Aaron C., Petigura, Erik A. et al. 2019. "A Super-Earth and Sub-Neptune Transiting the Late-type M Dwarf LP 791-18." The Astrophysical Journal 883:L16.
ID: 154442
Type: article
Authors: Crossfield, Ian J. M.; Waalkes, William; Newton, Elisabeth R.; Narita, Norio; Muirhead, Philip; Ment, Kristo; Matthews, Elisabeth; Kraus, Adam; Kostov, Veselin; Kosiarek, Molly R.; Kane, Stephen R.; Isaacson, Howard; Halverson, Sam; Gonzales, Erica; Everett, Mark; Dragomir, Diana; Collins, Karen A.; Chontos, Ashley; Berardo, David; Winters, Jennifer G.; Winn, Joshua N.; Scott, Nicholas J.; Rojas-Ayala, Barbara; Rizzuto, Aaron C.; Petigura, Erik A.; Peterson, Merrin; Mocnik, Teo; Mikal-Evans, Thomas; Mehrle, Nicholas; Matson, Rachel; Kuzuhara, Masayuki; Irwin, Jonathan; Huber, Daniel; Huang, Chelsea; Howell, Steve; Howard, Andrew W.; Hirano, Teruyuki; Fulton, Benjamin J.; Dupuy, Trent; Dressing, Courtney D.; Dalba, Paul A.; Charbonneau, David; Burt, Jennifer; Berta-Thompson, Zachory; Benneke, Björn; Watanabe, Noriharu; Twicken, Joseph D.; Tamura, Motohide; Schlieder, Joshua; Seager, S.; Rose, Mark E.; Ricker, George; Quintana, Elisa; Lépine, Sébastien; Latham, David W.; Kotani, Takayuki; Jenkins, Jon M.; Hori, Yasunori; Colon, Knicole; Caldwell, Douglas A.
Abstract: Planets occur most frequently around cool dwarfs, but only a handful of specific examples are known to orbit the latest-type M stars. Using TESS photometry, we report the discovery of two planets transiting the low- mass star called LP 791-18 (identified by TESS as TOI 736). This star has spectral type M6V, effective temperature 2960 K, and radius 0.17 R , making it the third-coolest star known to host planets. The two planets straddle the radius gap seen for smaller exoplanets they include a 1.1R planet on a 0.95 day orbit and a 2.3R planet on a 5 day orbit. Because the host star is small the decrease in light during these planets' transits is fairly large (0.4% and 1.7%). This has allowed us to detect both planets' transits from ground-based photometry, refining their radii and orbital ephemerides. In the future, radial velocity observations and transmission spectroscopy can both probe these planets' bulk interior and atmospheric compositions, and additional photometric monitoring would be sensitive to even smaller transiting planets.
The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M DwarfKostov, Veselin B.Schlieder, Joshua E.Barclay, ThomasQuintana, Elisa V.Colón, Knicole D.Brande, JonathanCollins, Karen A.Feinstein, Adina D.Hadden, SamuelKane, Stephen R.Kreidberg, LauraKruse, EthanLam, ChristopherMatthews, ElisabethMontet, Benjamin T.Pozuelos, Francisco J.Stassun, Keivan G.Winters, Jennifer G.Ricker, GeorgeVanderspek, RolandLatham, DavidSeager, SaraWinn, JoshuaJenkins, Jon M.Afanasev, DennisArmstrong, James J. D.Arney, GiadaBoyd, PatriciaBarentsen, GeertBarkaoui, KhalidBatalha, Natalie E.Beichman, CharlesBayliss, DanielBurke, ChristopherBurdanov, ArtemCacciapuoti, LucaCarson, AndrewCharbonneau, DavidChristiansen, JessieCiardi, DavidClampin, MarkCollins, Kevin I.Conti, Dennis M.Coughlin, JeffreyCovone, GiovanniCrossfield, IanDelrez, LaetitiaDomagal-Goldman, ShawnDressing, CourtneyDucrot, ElsaEssack, ZahraEverett, Mark E.Fauchez, ThomasForeman-Mackey, DanielGan, TianjunGilbert, EmilyGillon, MichaëlGonzales, EricaHamann, AaronHedges, ChristinaHocutt, HannahHoffman, KelseyHorch, Elliott P.Horne, KeithHowell, SteveHynes, ShaneIreland, MichaelIrwin, Jonathan M.Isopi, GiovanniJensen, Eric L. N.Jehin, EmmanuëlKaltenegger, LisaKielkopf, John F.Kopparapu, RaviLewis, NikoleLopez, EricLissauer, Jack J.Mann, Andrew W.Mallia, FrancoMandell, AviMatson, Rachel A.Mazeh, TseviMonsue, TeresaMoran, Sarah E.Moran, VickieMorley, Caroline V.Morris, BrettMuirhead, PhilipMukai, KojiMullally, SusanMullally, FergalMurray, CatrionaNarita, NorioPalle, EnricPidhorodetska, DariaQuinn, DavidRelles, HowardRinehart, StephenRitsko, MatthewRodriguez, Joseph E.Rowden, PamelaRowe, Jason F.Sebastian, DanielSefako, RamotholoShahaf, SaharShporer, AviTañón Reyes, NaylynnTenenbaum, PeterTing, Eric B.Twicken, Joseph D.van Belle, Gerard T.Vega, LauraVolosin, JeffreyWalkowicz, Lucianne M.Youngblood, AllisonDOI: info:10.3847/1538-3881/ab2459v. 15832
Kostov, Veselin B., Schlieder, Joshua E., Barclay, Thomas, Quintana, Elisa V., Colón, Knicole D., Brande, Jonathan, Collins, Karen A., Feinstein, Adina D., Hadden, Samuel, Kane, Stephen R., Kreidberg, Laura, Kruse, Ethan, Lam, Christopher, Matthews, Elisabeth, Montet, Benjamin T., Pozuelos, Francisco J., Stassun, Keivan G., Winters, Jennifer G., Ricker, George, Vanderspek, Roland, Latham, David, Seager, Sara, Winn, Joshua, Jenkins, Jon M., Afanasev, Dennis et al. 2019. "The L 98-59 System: Three Transiting, Terrestrial-size Planets Orbiting a Nearby M Dwarf." The Astronomical Journal 158:32.
ID: 154184
Type: article
Authors: Kostov, Veselin B.; Schlieder, Joshua E.; Barclay, Thomas; Quintana, Elisa V.; Colón, Knicole D.; Brande, Jonathan; Collins, Karen A.; Feinstein, Adina D.; Hadden, Samuel; Kane, Stephen R.; Kreidberg, Laura; Kruse, Ethan; Lam, Christopher; Matthews, Elisabeth; Montet, Benjamin T.; Pozuelos, Francisco J.; Stassun, Keivan G.; Winters, Jennifer G.; Ricker, George; Vanderspek, Roland; Latham, David; Seager, Sara; Winn, Joshua; Jenkins, Jon M.; Afanasev, Dennis; Armstrong, James J. D.; Arney, Giada; Boyd, Patricia; Barentsen, Geert; Barkaoui, Khalid; Batalha, Natalie E.; Beichman, Charles; Bayliss, Daniel; Burke, Christopher; Burdanov, Artem; Cacciapuoti, Luca; Carson, Andrew; Charbonneau, David; Christiansen, Jessie; Ciardi, David; Clampin, Mark; Collins, Kevin I.; Conti, Dennis M.; Coughlin, Jeffrey; Covone, Giovanni; Crossfield, Ian; Delrez, Laetitia; Domagal-Goldman, Shawn; Dressing, Courtney; Ducrot, Elsa; Essack, Zahra; Everett, Mark E.; Fauchez, Thomas; Foreman-Mackey, Daniel; Gan, Tianjun; Gilbert, Emily; Gillon, Michaël; Gonzales, Erica; Hamann, Aaron; Hedges, Christina; Hocutt, Hannah; Hoffman, Kelsey; Horch, Elliott P.; Horne, Keith; Howell, Steve; Hynes, Shane; Ireland, Michael; Irwin, Jonathan M.; Isopi, Giovanni; Jensen, Eric L. N.; Jehin, Emmanuël; Kaltenegger, Lisa; Kielkopf, John F.; Kopparapu, Ravi; Lewis, Nikole; Lopez, Eric; Lissauer, Jack J.; Mann, Andrew W.; Mallia, Franco; Mandell, Avi; Matson, Rachel A.; Mazeh, Tsevi; Monsue, Teresa; Moran, Sarah E.; Moran, Vickie; Morley, Caroline V.; Morris, Brett; Muirhead, Philip; Mukai, Koji; Mullally, Susan; Mullally, Fergal; Murray, Catriona; Narita, Norio; Palle, Enric; Pidhorodetska, Daria; Quinn, David; Relles, Howard; Rinehart, Stephen; Ritsko, Matthew; Rodriguez, Joseph E.; Rowden, Pamela; Rowe, Jason F.; Sebastian, Daniel; Sefako, Ramotholo; Shahaf, Sahar; Shporer, Avi; Tañón Reyes, Naylynn; Tenenbaum, Peter; Ting, Eric B.; Twicken, Joseph D.; van Belle, Gerard T.; Vega, Laura; Volosin, Jeffrey; Walkowicz, Lucianne M.; Youngblood, Allison
Abstract: We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three terrestrial-size planets transiting L 98-59 (TOI-175, TIC 307210830)-a bright M dwarf at a distance of 10.6 pc. Using the Gaia- measured distance and broadband photometry, we find that the host star is an M3 dwarf. Combined with the TESS transits from three sectors, the corresponding stellar parameters yield planet radii ranging from 0.8 R to 1.6 R . All three planets have short orbital periods, ranging from 2.25 to 7.45 days with the outer pair just wide of a 2:1 period resonance. Diagnostic tests produced by the TESS Data Validation Report and the vetting package DAVE rule out common false- positive sources. These analyses, along with dedicated follow-up and the multiplicity of the system, lend confidence that the observed signals are caused by planets transiting L 98-59 and are not associated with other sources in the field. The L 98-59 system is interesting for a number of reasons: the host star is bright (V = 11.7 mag, K = 7.1 mag) and the planets are prime targets for further follow-up observations including precision radial-velocity mass measurements and future transit spectroscopy with the James Webb Space Telescope; the near-resonant configuration makes the system a laboratory to study planetary system dynamical evolution; and three planets of relatively similar size in the same system present an opportunity to study terrestrial planets where other variables (age, metallicity, etc.) can be held constant. L 98-59 will be observed in four more TESS sectors, which will provide a wealth of information on the three currently known planets and have the potential to reveal additional planets in the system.
A Second Terrestrial Planet Orbiting the Nearby M Dwarf LHS 1140Ment, KristoDittmann, Jason A.Astudillo-Defru, NicolaCharbonneau, DavidIrwin, JonathanBonfils, XavierMurgas, FelipeAlmenara, Jose-ManuelForveille, ThierryAgol, EricBallard, SarahBerta-Thompson, Zachory K.Bouchy, FrançoisCloutier, RyanDelfosse, XavierDoyon, RenéDressing, Courtney D.Esquerdo, Gilbert A.Haywood, Raphaëlle D.Kipping, David M.Latham, David W.Lovis, ChristopheNewton, Elisabeth R.Pepe, FrancescoRodriguez, Joseph E.Santos, Nuno C.Tan, Thiam-GuanUdry, StephaneWinters, Jennifer G.Wünsche, AnaëlDOI: info:10.3847/1538-3881/aaf1b1v. 15732
Ment, Kristo, Dittmann, Jason A., Astudillo-Defru, Nicola, Charbonneau, David, Irwin, Jonathan, Bonfils, Xavier, Murgas, Felipe, Almenara, Jose-Manuel, Forveille, Thierry, Agol, Eric, Ballard, Sarah, Berta-Thompson, Zachory K., Bouchy, François, Cloutier, Ryan, Delfosse, Xavier, Doyon, René, Dressing, Courtney D., Esquerdo, Gilbert A., Haywood, Raphaëlle D., Kipping, David M., Latham, David W., Lovis, Christophe, Newton, Elisabeth R., Pepe, Francesco, Rodriguez, Joseph E. et al. 2019. "A Second Terrestrial Planet Orbiting the Nearby M Dwarf LHS 1140." The Astronomical Journal 157:32.
ID: 150413
Type: article
Authors: Ment, Kristo; Dittmann, Jason A.; Astudillo-Defru, Nicola; Charbonneau, David; Irwin, Jonathan; Bonfils, Xavier; Murgas, Felipe; Almenara, Jose-Manuel; Forveille, Thierry; Agol, Eric; Ballard, Sarah; Berta-Thompson, Zachory K.; Bouchy, François; Cloutier, Ryan; Delfosse, Xavier; Doyon, René; Dressing, Courtney D.; Esquerdo, Gilbert A.; Haywood, Raphaëlle D.; Kipping, David M.; Latham, David W.; Lovis, Christophe; Newton, Elisabeth R.; Pepe, Francesco; Rodriguez, Joseph E.; Santos, Nuno C.; Tan, Thiam-Guan; Udry, Stephane; Winters, Jennifer G.; Wünsche, Anaël
Abstract: LHS 1140 is a nearby mid-M dwarf known to host a temperate rocky super-Earth (LHS 1140 b) on a 24.737-day orbit. Based on photometric observations by MEarth and Spitzer as well as Doppler spectroscopy from the High Accuracy Radial velocity Planet Searcher, we report the discovery of an additional transiting rocky companion (LHS 1140 c) with a mass of 1.81 ± 0.39 M and a radius of 1.282 ± 0.024 R on a tighter, 3.77795-day orbit. We also obtain more precise estimates for the mass and radius of LHS 1140 b, which are 6.98 ± 0.89 M and 1.727 ± 0.032 R . The mean densities of planets b and c are 7.5 ± 1.0 g cm‑3 and 4.7 ± 1.1 g cm‑3, respectively, both consistent with the Earth’s ratio of iron to magnesium silicate. The orbital eccentricities of LHS 1140 b and c are consistent with circular orbits and constrained to be below 0.06 and 0.31, respectively, with 90% confidence. Because the orbits of the two planets are coplanar and because we know from previous analyses of Kepler data that compact systems of small planets orbiting M dwarfs are commonplace, a search for more transiting planets in the LHS 1140 system could be fruitful. LHS 1140 c is one of the few known nearby terrestrial planets whose atmosphere could be studied with the upcoming James Webb Space Telescope.
Near-resonance in a System of Sub-Neptunes from TESSQuinn, Samuel N.Becker, Juliette C.Rodriguez, Joseph E.Hadden, SamHuang, Chelsea X.Morton, Timothy D.Adams, Fred C.Armstrong, DavidEastman, Jason D.Horner, JonathanKane, Stephen R.Lissauer, Jack J.Twicken, Joseph D.Vanderburg, AndrewWittenmyer, RobRicker, George R.Vanderspek, Roland K.Latham, David W.Seager, SaraWinn, Joshua N.Jenkins, Jon M.Agol, EricBarkaoui, KhalidBeichman, Charles A.Bouchy, FrançoisBouma, L. G.Burdanov, ArtemCampbell, JenniferCarlino, RobertoCartwright, Scott M.Charbonneau, DavidChristiansen, Jessie L.Ciardi, DavidCollins, Karen A.Collins, Kevin I.Conti, Dennis M.Crossfield, Ian J. M.Daylan, TansuDittmann, JasonDoty, JohnDragomir, DianaDucrot, ElsaGillon, MichaelGlidden, AnaGoeke, Robert F.Gonzales, Erica J.Hełminiak, Krzysztof G.Horch, Elliott P.Howell, Steve B.Jehin, EmmanuelJensen, Eric L. N.Kielkopf, John F.Kristiansen, Martti H.Law, NicholasMann, Andrew W.Marmier, MaximeMatson, Rachel A.Matthews, ElisabethMazeh, TseviMori, MayukoMurgas, FelipeMurray, CatrionaNarita, NorioNielsen, Louise D.Ottoni, GaëlPalle, EnricPawłaszek, RafałPepe, FrancescoPitogo de Leon, JeromePozuelos, Francisco J.Relles, Howard M.Schlieder, Joshua E.Sebastian, DanielSégransan, DamienShporer, AviStassun, Keivan G.Tamura, MotohideUdry, StéphaneWaite, IanWinters, Jennifer G.Ziegler, CarlDOI: info:10.3847/1538-3881/ab3f2bv. 158177
Quinn, Samuel N., Becker, Juliette C., Rodriguez, Joseph E., Hadden, Sam, Huang, Chelsea X., Morton, Timothy D., Adams, Fred C., Armstrong, David, Eastman, Jason D., Horner, Jonathan, Kane, Stephen R., Lissauer, Jack J., Twicken, Joseph D., Vanderburg, Andrew, Wittenmyer, Rob, Ricker, George R., Vanderspek, Roland K., Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Agol, Eric, Barkaoui, Khalid, Beichman, Charles A., Bouchy, François et al. 2019. "Near-resonance in a System of Sub-Neptunes from TESS." The Astronomical Journal 158:177.
ID: 154591
Type: article
Authors: Quinn, Samuel N.; Becker, Juliette C.; Rodriguez, Joseph E.; Hadden, Sam; Huang, Chelsea X.; Morton, Timothy D.; Adams, Fred C.; Armstrong, David; Eastman, Jason D.; Horner, Jonathan; Kane, Stephen R.; Lissauer, Jack J.; Twicken, Joseph D.; Vanderburg, Andrew; Wittenmyer, Rob; Ricker, George R.; Vanderspek, Roland K.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Agol, Eric; Barkaoui, Khalid; Beichman, Charles A.; Bouchy, François; Bouma, L. G.; Burdanov, Artem; Campbell, Jennifer; Carlino, Roberto; Cartwright, Scott M.; Charbonneau, David; Christiansen, Jessie L.; Ciardi, David; Collins, Karen A.; Collins, Kevin I.; Conti, Dennis M.; Crossfield, Ian J. M.; Daylan, Tansu; Dittmann, Jason; Doty, John; Dragomir, Diana; Ducrot, Elsa; Gillon, Michael; Glidden, Ana; Goeke, Robert F.; Gonzales, Erica J.; Hełminiak, Krzysztof G.; Horch, Elliott P.; Howell, Steve B.; Jehin, Emmanuel; Jensen, Eric L. N.; Kielkopf, John F.; Kristiansen, Martti H.; Law, Nicholas; Mann, Andrew W.; Marmier, Maxime; Matson, Rachel A.; Matthews, Elisabeth; Mazeh, Tsevi; Mori, Mayuko; Murgas, Felipe; Murray, Catriona; Narita, Norio; Nielsen, Louise D.; Ottoni, Gaël; Palle, Enric; Pawłaszek, Rafał; Pepe, Francesco; Pitogo de Leon, Jerome; Pozuelos, Francisco J.; Relles, Howard M.; Schlieder, Joshua E.; Sebastian, Daniel; Ségransan, Damien; Shporer, Avi; Stassun, Keivan G.; Tamura, Motohide; Udry, Stéphane; Waite, Ian; Winters, Jennifer G.; Ziegler, Carl
Abstract: We report the Transiting Exoplanet Survey Satellite detection of a multi-planet system orbiting the V = 10.9 K0 dwarf TOI-125. We find evidence for up to five planets, with varying confidence. Three transit signals with high signal-to-noise ratio correspond to sub-Neptune-sized planets (2.76, 2.79, and 2.94 R ), and we statistically validate the planetary nature of the two inner planets (P b = 4.65 days, P c = 9.15 days). With only two transits observed, we report the outer object (P .03 = 19.98 days) as a planet candidate with high signal-to-noise ratio. We also detect a candidate transiting super-Earth (1.4 R ) with an orbital period of only 12.7 hr and a candidate Neptune-sized planet (4.2 R ) with a period of 13.28 days, both at low signal-to-noise ratio. This system is amenable to mass determination via radial velocities and transit-timing variations, and provides an opportunity to study planets of similar size while controlling for age and environment. The ratio of orbital periods between TOI-125 b and c (P c /P b = 1.97) is slightly lower than an exact 2:1 commensurability and is atypical of multiple planet systems from Kepler, which show a preference for period ratios just wide of first-order period ratios. A dynamical analysis refines the allowed parameter space through stability arguments and suggests that despite the nearly commensurate periods, the system is unlikely to be in resonance.
TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844Vanderspek, RolandHuang, Chelsea X.Vanderburg, AndrewRicker, George R.Latham, David W.Seager, SaraWinn, Joshua N.Jenkins, Jon M.Burt, JenniferDittmann, JasonNewton, ElisabethQuinn, Samuel N.Shporer, AviCharbonneau, DavidIrwin, JonathanMent, KristoWinters, Jennifer G.Collins, Karen A.Evans, PhilGan, TianjunHart, RhodesJensen, Eric L. N.Kielkopf, JohnMao, ShudeWaalkes, WilliamBouchy, FrançoisMarmier, MaximeNielsen, Louise D.Ottoni, GaëlPepe, FrancescoSégransan, DamienUdry, StéphaneHenry, ToddParedes, Leonardo A.James, Hodari-SadikiHinojosa, Rodrigo H.Silverstein, Michele L.Palle, EnricBerta-Thompson, ZachoryCrossfield, IanDavies, Misty D.Dragomir, DianaFausnaugh, MichaelGlidden, AnaPepper, JoshuaMorgan, Edward H.Rose, MarkTwicken, Joseph D.Villaseñor, Jesus Noel S.Yu, LiangBakos, GasparBean, JacobBuchhave, Lars A.Christensen-Dalsgaard, JørgenChristiansen, Jessie L.Ciardi, David R.Clampin, MarkDe Lee, NathanDeming, DrakeDoty, JohnJernigan, J. GarrettKaltenegger, LisaLissauer, Jack J.McCullough, P. R.Narita, NorioPaegert, MartinPal, AndrasRinehart, StephenSasselov, DimitarSato, Bun'eiSozzetti, AlessandroStassun, Keivan G.Torres, GuillermoDOI: info:10.3847/2041-8213/aafb7av. 871L24
Vanderspek, Roland, Huang, Chelsea X., Vanderburg, Andrew, Ricker, George R., Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Burt, Jennifer, Dittmann, Jason, Newton, Elisabeth, Quinn, Samuel N., Shporer, Avi, Charbonneau, David, Irwin, Jonathan, Ment, Kristo, Winters, Jennifer G., Collins, Karen A., Evans, Phil, Gan, Tianjun, Hart, Rhodes, Jensen, Eric L. N., Kielkopf, John, Mao, Shude, Waalkes, William et al. 2019. "TESS Discovery of an Ultra-short-period Planet around the Nearby M Dwarf LHS 3844." Astrophysical Journal Letters 871:L24.
ID: 150534
Type: article
Authors: Vanderspek, Roland; Huang, Chelsea X.; Vanderburg, Andrew; Ricker, George R.; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Burt, Jennifer; Dittmann, Jason; Newton, Elisabeth; Quinn, Samuel N.; Shporer, Avi; Charbonneau, David; Irwin, Jonathan; Ment, Kristo; Winters, Jennifer G.; Collins, Karen A.; Evans, Phil; Gan, Tianjun; Hart, Rhodes; Jensen, Eric L. N.; Kielkopf, John; Mao, Shude; Waalkes, William; Bouchy, François; Marmier, Maxime; Nielsen, Louise D.; Ottoni, Gaël; Pepe, Francesco; Ségransan, Damien; Udry, Stéphane; Henry, Todd; Paredes, Leonardo A.; James, Hodari-Sadiki; Hinojosa, Rodrigo H.; Silverstein, Michele L.; Palle, Enric; Berta-Thompson, Zachory; Crossfield, Ian; Davies, Misty D.; Dragomir, Diana; Fausnaugh, Michael; Glidden, Ana; Pepper, Joshua; Morgan, Edward H.; Rose, Mark; Twicken, Joseph D.; Villaseñor, Jesus Noel S.; Yu, Liang; Bakos, Gaspar; Bean, Jacob; Buchhave, Lars A.; Christensen-Dalsgaard, Jørgen; Christiansen, Jessie L.; Ciardi, David R.; Clampin, Mark; De Lee, Nathan; Deming, Drake; Doty, John; Jernigan, J. Garrett; Kaltenegger, Lisa; Lissauer, Jack J.; McCullough, P. R.; Narita, Norio; Paegert, Martin; Pal, Andras; Rinehart, Stephen; Sasselov, Dimitar; Sato, Bun'ei; Sozzetti, Alessandro; Stassun, Keivan G.; Torres, Guillermo
Abstract: Data from the newly commissioned Transiting Exoplanet Survey Satellite has revealed a "hot Earth" around LHS 3844, an M dwarf located 15 pc away. The planet has a radius of 1.303+/- 0.022 R and orbits the star every 11 hr. Although the existence of an atmosphere around such a strongly irradiated planet is questionable, the star is bright enough (I = 11.9, K = 9.1) for this possibility to be investigated with transit and occultation spectroscopy. The star's brightness and the planet's short period will also facilitate the measurement of the planet's mass through Doppler spectroscopy.
The Solar Neighborhood. XLV. The Stellar Multiplicity Rate of M Dwarfs Within 25 pcWinters, Jennifer G.Henry, Todd J.Jao, Wei-ChunSubasavage, John P.Chatelain, Joseph P.Slatten, KenRiedel, Adric R.Silverstein, Michele L.Payne, Matthew J.DOI: info:10.3847/1538-3881/ab05dcv. 157216
Winters, Jennifer G., Henry, Todd J., Jao, Wei-Chun, Subasavage, John P., Chatelain, Joseph P., Slatten, Ken, Riedel, Adric R., Silverstein, Michele L., and Payne, Matthew J. 2019. "The Solar Neighborhood. XLV. The Stellar Multiplicity Rate of M Dwarfs Within 25 pc." The Astronomical Journal 157:216.
ID: 152919
Type: article
Authors: Winters, Jennifer G.; Henry, Todd J.; Jao, Wei-Chun; Subasavage, John P.; Chatelain, Joseph P.; Slatten, Ken; Riedel, Adric R.; Silverstein, Michele L.; Payne, Matthew J.
Abstract: We present results of the largest, most comprehensive study ever done of the stellar multiplicity of the most common stars in the Galaxy, the red dwarfs. We have conducted an all-sky volume-limited survey for stellar companions to 1120 M dwarf primaries known to lie within 25 pc of the Sun via trigonometric parallaxes. In addition to a comprehensive literature search, stars were explored in new surveys for companions at separations of 2″–300″. A reconnaissance of wide companions to separations of 300″ was done via blinking archival images. I-band images were used to search our sample for companions at separations of 2″–180″. Various astrometric and photometric methods were used to probe the inner 2″ to reveal close companions. We report the discovery of 20 new companions and identify 56 candidate multiple systems. We find a stellar multiplicity rate of 26.8 ± 1.4% and a stellar companion rate of 32.4 ± 1.4% for M dwarfs. There is a broad peak in the separation distribution of the companions at 4–20 au, with a weak trend of smaller projected linear separations for lower mass primaries. A hint that M-dwarf multiplicity may be a function of tangential velocity is found, with faster moving, presumably older, stars found to be multiple somewhat less often. We calculate that stellar companions make up at least 17% of mass attributed to M dwarfs in the solar neighborhood, with roughly 11% of M-dwarf mass hidden as unresolved companions. Finally, when considering all M-dwarf primaries and companions, we find that the mass distribution for M dwarfs increases to the end of the stellar main sequence.
Three Red Suns in the Sky: A Transiting, Terrestrial Planet in a Triple M-dwarf System at 6.9 pcWinters, Jennifer G.Medina, Amber A.Irwin, Jonathan M.Charbonneau, DavidAstudillo-Defru, NicolaHorch, Elliott P.Eastman, Jason D.Halley Vrijmoet, EliotHenry, Todd J.Diamond-Lowe, HannahWinston, ElaineBarclay, ThomasBonfils, XavierRicker, George R.Vanderspek, RolandLatham, David W.Seager, SaraWinn, Joshua N.Jenkins, Jon M.Udry, StéphaneTwicken, Joseph D.Teske, Johanna K.Tenenbaum, PeterPepe, FrancescoMurgas, FelipeMuirhead, Philip S.Mink, JessicaLovis, ChristopheLevine, Alan M.Lépine, SébastienJao, Wei-ChunHenze, Christopher E.Furész, GáborForveille, ThierryFigueira, PedroEsquerdo, Gilbert A.Dressing, Courtney D.Díaz, Rodrigo F.Delfosse, XavierBurke, Christopher J.Bouchy, FrançoisBerlind, PerryAlmenara, Jose-ManuelDOI: info:10.3847/1538-3881/ab364dv. 158152
Winters, Jennifer G., Medina, Amber A., Irwin, Jonathan M., Charbonneau, David, Astudillo-Defru, Nicola, Horch, Elliott P., Eastman, Jason D., Halley Vrijmoet, Eliot, Henry, Todd J., Diamond-Lowe, Hannah, Winston, Elaine, Barclay, Thomas, Bonfils, Xavier, Ricker, George R., Vanderspek, Roland, Latham, David W., Seager, Sara, Winn, Joshua N., Jenkins, Jon M., Udry, Stéphane, Twicken, Joseph D., Teske, Johanna K., Tenenbaum, Peter, Pepe, Francesco, Murgas, Felipe et al. 2019. "Three Red Suns in the Sky: A Transiting, Terrestrial Planet in a Triple M-dwarf System at 6.9 pc." The Astronomical Journal 158:152.
ID: 154724
Type: article
Authors: Winters, Jennifer G.; Medina, Amber A.; Irwin, Jonathan M.; Charbonneau, David; Astudillo-Defru, Nicola; Horch, Elliott P.; Eastman, Jason D.; Halley Vrijmoet, Eliot; Henry, Todd J.; Diamond-Lowe, Hannah; Winston, Elaine; Barclay, Thomas; Bonfils, Xavier; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Udry, Stéphane; Twicken, Joseph D.; Teske, Johanna K.; Tenenbaum, Peter; Pepe, Francesco; Murgas, Felipe; Muirhead, Philip S.; Mink, Jessica; Lovis, Christophe; Levine, Alan M.; Lépine, Sébastien; Jao, Wei-Chun; Henze, Christopher E.; Furész, Gábor; Forveille, Thierry; Figueira, Pedro; Esquerdo, Gilbert A.; Dressing, Courtney D.; Díaz, Rodrigo F.; Delfosse, Xavier; Burke, Christopher J.; Bouchy, François; Berlind, Perry; Almenara, Jose-Manuel
Abstract: We present the discovery from Transiting Exoplanet Survey Satellite (TESS) data of LTT 1445Ab. At a distance of 6.9 pc, it is the second nearest transiting exoplanet system found to date, and the closest one known for which the primary is an M dwarf. The host stellar system consists of three mid-to-late M dwarfs in a hierarchical configuration, which are blended in one TESS pixel. We use MEarth data and results from the Science Processing Operations Center data validation report to determine that the planet transits the primary star in the system. The planet has a radius of {1.38}-0.12+0.13 {R}\oplus , an orbital period of {5.35882}-0.00031+0.00030 days, and an equilibrium temperature of {433}-27+28 K. With radial velocities from the High Accuracy Radial Velocity Planet Searcher, we place a 3σ upper mass limit of 8.4 {M}\oplus on the planet. LTT 1445Ab provides one of the best opportunities to date for the spectroscopic study of the atmosphere of a terrestrial world. We also present a detailed characterization of the host stellar system. We use high-resolution spectroscopy and imaging to rule out the presence of any other close stellar or brown dwarf companions. Nineteen years of photometric monitoring of A and BC indicate a moderate amount of variability, in agreement with that observed in the TESS light-curve data. We derive a preliminary astrometric orbit for the BC pair that reveals an edge-on and eccentric configuration. The presence of a transiting planet in this system hints that the entire system may be co- planar, implying that the system may have formed from the early fragmentation of an individual protostellar core.
Four New Eclipsing Mid M-dwarf Systems from the New Luyten Two Tenths CatalogIrwin, Jonathan M.Charbonneau, DavidEsquerdo, Gilbert A.Latham, David W.Winters, Jennifer G.Dittmann, Jason A.Newton, Elisabeth R.Berta-Thompson, Zachory K.Berlind, PerryCalkins, Michael L.DOI: info:10.3847/1538-3881/aad9a3v. 156140
Irwin, Jonathan M., Charbonneau, David, Esquerdo, Gilbert A., Latham, David W., Winters, Jennifer G., Dittmann, Jason A., Newton, Elisabeth R., Berta-Thompson, Zachory K., Berlind, Perry, and Calkins, Michael L. 2018. "Four New Eclipsing Mid M-dwarf Systems from the New Luyten Two Tenths Catalog." The Astronomical Journal 156:140.
ID: 149407
Type: article
Authors: Irwin, Jonathan M.; Charbonneau, David; Esquerdo, Gilbert A.; Latham, David W.; Winters, Jennifer G.; Dittmann, Jason A.; Newton, Elisabeth R.; Berta-Thompson, Zachory K.; Berlind, Perry; Calkins, Michael L.
Abstract: Using data from the MEarth-North and MEarth-South transit surveys, we present the detection of eclipses in four mid M-dwarf systems: LP 107-25, LP 261-75, LP 796-24, and LP 991-15. Combining the MEarth photometry with spectroscopic follow-up observations, we show that LP 107-25 and LP 796-24 are short-period (1.388 and 0.523 day, respectively) eclipsing binaries in triple-lined systems with substantial third-light contamination from distant companions. LP 261-75 is a short-period (1.882 day) single-lined system consisting of a mid M-dwarf eclipsed by a probable brown dwarf secondary, with another distant visual brown dwarf companion. LP 991-15 is a long-period (29.3 day) double-lined eclipsing binary on an eccentric orbit with a geometry that produces only primary eclipses. A spectroscopic orbit is given for LP 991-15, and initial orbits for LP 107-25 and LP 261-75.
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0–10Mayo, Andrew W.Vanderburg, AndrewLatham, David W.Bieryla, AllysonMorton, Timothy D.Buchhave, Lars A.Dressing, Courtney D.Beichman, CharlesBerlind, PerryCalkins, Michael L.Ciardi, David R.Crossfield, Ian J. M.Esquerdo, Gilbert A.Everett, Mark E.Gonzales, Erica J.Hirsch, Lea A.Horch, Elliott P.Howard, Andrew W.Howell, Steve B.Livingston, JohnPatel, RahulPetigura, Erik A.Schlieder, Joshua E.Scott, Nicholas J.Schumer, Clea F.Sinukoff, EvanTeske, JohannaWinters, Jennifer G.DOI: info:10.3847/1538-3881/aaadffv. 155136
Mayo, Andrew W., Vanderburg, Andrew, Latham, David W., Bieryla, Allyson, Morton, Timothy D., Buchhave, Lars A., Dressing, Courtney D., Beichman, Charles, Berlind, Perry, Calkins, Michael L., Ciardi, David R., Crossfield, Ian J. M., Esquerdo, Gilbert A., Everett, Mark E., Gonzales, Erica J., Hirsch, Lea A., Horch, Elliott P., Howard, Andrew W., Howell, Steve B., Livingston, John, Patel, Rahul, Petigura, Erik A., Schlieder, Joshua E., Scott, Nicholas J., Schumer, Clea F. et al. 2018. "275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0–10." The Astronomical Journal 155:136.
ID: 146162
Type: article
Authors: Mayo, Andrew W.; Vanderburg, Andrew; Latham, David W.; Bieryla, Allyson; Morton, Timothy D.; Buchhave, Lars A.; Dressing, Courtney D.; Beichman, Charles; Berlind, Perry; Calkins, Michael L.; Ciardi, David R.; Crossfield, Ian J. M.; Esquerdo, Gilbert A.; Everett, Mark E.; Gonzales, Erica J.; Hirsch, Lea A.; Horch, Elliott P.; Howard, Andrew W.; Howell, Steve B.; Livingston, John; Patel, Rahul; Petigura, Erik A.; Schlieder, Joshua E.; Scott, Nicholas J.; Schumer, Clea F.; Sinukoff, Evan; Teske, Johanna; Winters, Jennifer G.
Abstract: Since 2014, NASA's K2 mission has observed large portions of the ecliptic plane in search of transiting planets and has detected hundreds of planet candidates. With observations planned until at least early 2018, K2 will continue to identify more planet candidates. We present here 275 planet candidates observed during Campaigns 0–10 of the
New Rotation Period Measurements for M Dwarfs in the Southern Hemisphere: An Abundance of Slowly Rotating, Fully Convective StarsNewton, Elisabeth R.Mondrik, NicholasIrwin, JonathanWinters, Jennifer G.Charbonneau, DavidDOI: info:10.3847/1538-3881/aad73bv. 156217
Newton, Elisabeth R., Mondrik, Nicholas, Irwin, Jonathan, Winters, Jennifer G., and Charbonneau, David. 2018. "New Rotation Period Measurements for M Dwarfs in the Southern Hemisphere: An Abundance of Slowly Rotating, Fully Convective Stars." The Astronomical Journal 156:217.
ID: 150050
Type: article
Authors: Newton, Elisabeth R.; Mondrik, Nicholas; Irwin, Jonathan; Winters, Jennifer G.; Charbonneau, David
Abstract: Stellar rotation periods are valuable both for constraining models of angular momentum loss and for understanding how magnetic features impact inferences of exoplanet parameters. Building on our previous work in the northern hemisphere, we have used long-term, ground-based photometric monitoring from the MEarth Observatory to measure 234 rotation periods for nearby, southern hemisphere M dwarfs. Notable examples include the exoplanet hosts GJ 1132, LHS 1140, and Proxima Centauri. We find excellent agreement between our data and K2 photometry for the overlapping subset. Among the sample of stars with the highest quality data sets, we recover periods in 66%; as the length of the data set increases, our recovery rate approaches 100%. The longest rotation periods we detect are around 140 days, which we suggest represent the periods that are reached when M dwarfs are as old as the local thick disk (about 9 Gyr).