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

We report the discovery of KMT-2018-BLG-1990Lb, a Jovian planet orbiting a late M dwarf at a distance of , and projected at 2.6 0.6 times the snow line distance, i.e., . This is the second Jovian planet discovered by the Korea Microlensing Telescope Network (KMTNet) in its low-cadence (0.4 hr−1) fie...

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Bibliographic Details
Published in:The Astronomical journal 2019-10, Vol.158 (4), p.151
Main 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.
Format: Article
Language:English
Subjects:
Astronomy
gravitational lensing: micro
Microlenses
Planets
Polls & surveys
Snow
Snow line
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Summary:We report the discovery of KMT-2018-BLG-1990Lb, a Jovian planet orbiting a late M dwarf at a distance of , and projected at 2.6 0.6 times the snow line distance, i.e., . 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.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab3a34