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

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dc.abstract.enWe report the discovery and the analysis of the short ( ${t}_{{\rm{E}}}\ 5$ 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<SUP>-3</SUP>, 4.5 × 10<SUP>-3</SUP> and 4.5 × 10<SUP>-2</SUP>, respectively. The first model is the best-fit model, while the second model is disfavored by Δχ<SUP>2</SUP> ˜ 3. The last model is strongly disfavored by Δχ<SUP>2</SUP> ˜ 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 μ<SUB>rel</SUB> ˜ 9 mas yr<SUP>-1</SUP>, so the source and lens could be resolved by current adaptive-optics instruments in 2020 if the lens is luminous.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorZhang, Xiangyu
dc.contributor.authorZang, Weicheng
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorGould, Andrew
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorWang, Tianshu
dc.contributor.authorYang, Hongjing
dc.contributor.authorMao, Shude
dc.contributor.authorMróz, Przemysław
dc.contributor.authorSkowron, Jan
dc.contributor.authorPoleski, Radosław
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorHan, Cheongho
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorJung, Youn Kil
dc.contributor.authorShin, In-Gu
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorZhu, Wei
dc.contributor.authorCha, Sang-Mok
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorKim, Hyoun-Woo
dc.contributor.authorKim, Seung-Lee
dc.contributor.authorLee, Chung-Uk
dc.contributor.authorLee, Dong-Joo
dc.contributor.authorLee, Yongseok
dc.contributor.authorPark, Byeong-Gon
dc.contributor.authorPogge, Richard W.
dc.date.accessioned2024-01-25T15:17:19Z
dc.date.available2024-01-25T15:17:19Z
dc.date.copyright2019-11-06
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume159
dc.identifier.doi10.3847/1538-3881/AB6F6D
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114494
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020AJ....159..116Z
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages116
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
dc.typeJournalArticle
dspace.entity.typePublication