KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-cadence Microlensing Field

KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-cadence Microlensing FieldRyu, Yoon-HyunHwang, Kyu-HaGould, AndrewAlbrow, Michael D.Chung, Sun-JuHan, CheonghoJung, Youn KilShin, In-GuShvartzvald, YossiYee, Jennifer C.Zang, WeichengCha, Sang-MokKim, Dong-JinKim, Hyoun-WooKim, Seung-LeeLee, Chung-UkLee, Dong-JooLee, YongseokPark, Byeong-GonPogge, Richard W.DOI: info:10.3847/1538-3881/ab3a34v. 158151
Ryu, Yoon-Hyun, Hwang, Kyu-Ha, Gould, Andrew, Albrow, Michael D., Chung, Sun-Ju, Han, Cheongho, Jung, Youn Kil, Shin, In-Gu, Shvartzvald, Yossi, Yee, Jennifer C., Zang, Weicheng, Cha, Sang-Mok, Kim, Dong-Jin, Kim, Hyoun-Woo, Kim, Seung-Lee, Lee, Chung-Uk, Lee, Dong-Joo, Lee, Yongseok, Park, Byeong-Gon, and Pogge, Richard W. 2019. "KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-cadence Microlensing Field." The Astronomical Journal 158:151. https://doi.org/10.3847/1538-3881/ab3a34
ID: 154701
Type: article
Authors: Ryu, Yoon-Hyun; Hwang, Kyu-Ha; Gould, Andrew; Albrow, Michael D.; Chung, Sun-Ju; Han, Cheongho; Jung, Youn Kil; Shin, In-Gu; Shvartzvald, Yossi; Yee, Jennifer C.; Zang, Weicheng; Cha, Sang-Mok; Kim, Dong-Jin; Kim, Hyoun-Woo; Kim, Seung-Lee; Lee, Chung-Uk; Lee, Dong-Joo; Lee, Yongseok; Park, Byeong-Gon; Pogge, Richard W.
Abstract: We report the discovery of KMT-2018-BLG-1990Lb, a Jovian planet ({m}p={0.57}-0.25+0.79 {M}J) orbiting a late M dwarf (M={0.14}-0.06+0.20 {M}) at a distance of ({D}L={1.23}-0.43+1.06 {kpc}), and projected at 2.6 ± 0.6 times the snow line distance, i.e., {a}snow}\equiv 2.7 {au}(M/{M}). This is the second Jovian planet discovered by the Korea Microlensing Telescope Network (KMTNet) in its low-cadence (0.4 hr-1) fields, demonstrating that this population can be probed based on relatively low-cadence survey-only microlensing data. However, while many Jovian- planet microlensing events will not have caustic crossings (e.g., the previous case, KMT-2016-BLG-1397) and some that do will be well characterized by low-cadence survey observations (e.g., the current case), in general higher-cadence follow-up observations of the caustic crossings are preferable. Such follow-up observations require microlensing alerts, which KMTNet now provides.