OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?

We report the discovery and the analysis of the short ( days) planetary microlensing event, OGLE-2015-BLG-1771. The event was discovered by the Optical Gravitational Lensing Experiment, and the planetary anomaly (at I ∼ 19) was captured by The Korea Microlensing Telescope Network. The event has thre...

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Bibliographic Details
Published in:The Astronomical journal 2020-03, Vol.159 (3), p.116
Main Authors: Zhang, Xiangyu, Zang, Weicheng, Udalski, Andrzej, Gould, Andrew, Ryu, Yoon-Hyun, Wang, Tianshu, Yang, Hongjing, Mao, Shude, Mróz, Przemek, Skowron, Jan, Poleski, Radoslaw, Szyma ski, Micha K., Soszy ski, Igor, Pietrukowicz, Pawe, Koz owski, Szymon, Ulaczyk, Krzysztof, Albrow, Michael D., Chung, Sun-Ju, Han, Cheongho, Hwang, Kyu-Ha, Jung, Youn Kil, Shin, In-Gu, Shvartzvald, Yossi, Yee, Jennifer C., Zhu, Wei, 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:
Gravitational microlensing exoplanet detection
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Summary:We report the discovery and the analysis of the short ( days) planetary microlensing event, OGLE-2015-BLG-1771. The event was discovered by the Optical Gravitational Lensing Experiment, and the planetary anomaly (at I ∼ 19) was captured by The Korea Microlensing Telescope Network. The event has three surviving planetary models that explain the observed light curves, with planet-host mass ratio q ∼ 5.4 × 10−3, 4.5 × 10−3 and 4.5 × 10−2, respectively. The first model is the best-fit model, while the second model is disfavored by Δχ2 ∼ 3. The last model is strongly disfavored by Δχ2 ∼ 15 but not ruled out. A Bayesian analysis using a Galactic model indicates that the first two models are probably composed of a Saturn-mass planet orbiting a late M dwarf, while the third one could consist of a super-Jovian planet and a mid-mass brown dwarf. The source-lens relative proper motion is rel ∼ 9 mas yr−1, so the source and lens could be resolved by current adaptive-optics instruments in 2020 if the lens is luminous.
ISSN:0004-6256
1538-3881
DOI:10.3847/1538-3881/ab6f6d