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A Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551

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dc.abstract.enHigh-cadence observations of the Galactic bulge by the microlensing surveys led to the discovery of a handful of extremely short-timescale microlensing events that can be attributed to free-floating or wide-orbit planets. Here, we report the discovery of another strong free-floating planet candidate, which was found from the analysis of the gravitational microlensing event OGLE-2019-BLG-0551. The light curve of the event is characterized by a very short duration (≲3 days) and a very small amplitude (≲0.1 mag). From modeling of the light curve, we find that the Einstein timescale, ${t}_{{\rm{E}}}=0.381\pm 0.017$ day, is much shorter, and the angular Einstein radius, ${\theta }_{{\rm{E}}}=4.35\pm 0.34$ μas, is much smaller than those of typical lensing events produced by stellar-mass lenses ( ${t}_{{\rm{E}}}\sim 20$ days, ${\theta }_{{\rm{E}}}\sim 0.3$ mas), indicating that the lens is very likely to be a planetary-mass object. We conduct an extensive search for possible signatures of a companion star in the light curve of the event, finding no significant evidence for the putative host star. For the first time, we also demonstrate that the angular Einstein radius of the lens does not depend on blending in the low-magnification events with strong finite source effects.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPoleski, Radosław
dc.contributor.authorHan, Cheongho
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorGould, Andrew
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorSkowron, Jan
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorWrona, Marcin
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorJung, Youn Kil
dc.contributor.authorShin, In-Gu
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorZang, Weicheng
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.accessioned2024-01-24T17:37:38Z
dc.date.available2024-01-24T17:37:38Z
dc.date.copyright2020-03-02
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeŚrodki finansowe przyznane na realizację projektu w zakresie badań naukowych lub prac rozwojowych
dc.description.number6
dc.description.versionORIGINAL_AUTHOR
dc.description.volume159
dc.identifier.doi10.3847/1538-3881/AB8AEB
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101555
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020AJ....159..262M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages262
dc.rightsOther
dc.sciencecloudnosend
dc.titleA Free-floating or Wide-orbit Planet in the Microlensing Event OGLE-2019-BLG-0551
dc.typeJournalArticle
dspace.entity.typePublication