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KMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population

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dc.abstract.enWe report a new free-floating planet (FFP) candidate, KMT-2017-BLG-2820, with Einstein radius θ<SUB>E</SUB> ≃ 6 μas, lens-source relative proper motion μ<SUB>rel</SUB> ≃ 8 mas yr<SUP>-1</SUP>, and Einstein timescale t<SUB>E</SUB> = 6.5 hr. It is the third FFP candidate found in an ongoing study of giant-source finite-source point-lens (FSPL) events in the KMTNet database and the sixth FSPL FFP candidate overall. We find no significant evidence for a host. Based on their timescale distributions and detection rates, we argue that five of these six FSPL FFP candidates are drawn from the same population as the six point-source point-lens (PSPL) FFP candidates found by Mróz et al. in the OGLE-IV database. The θ<SUB>E</SUB> distribution of the FSPL FFPs implies that they are either sub-Jovian planets in the bulge or super-Earths in the disk. However, the apparent Einstein desert (10 ≲ θ<SUB>E</SUB>/μas ≲ 30) would argue for the latter. Whether each of the 12 (six FSPL and six PSPL) FFP candidates is truly an FFP or simply a very wide-separation planet can be determined at first adaptive optics (AO) light on 30 m telescopes, and earlier for some. If the latter, a second epoch of AO observations could measure the projected planet-host separation with a precision of ${ \mathcal O }(10\,\mathrm{au})$ . At the present time, the balance of evidence favors the unbound-planet hypothesis.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorMróz, Przemysław
dc.contributor.authorGould, Andrew
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorKim, Hyoun-Woo
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorJung, Youn Kil
dc.contributor.authorShin, In-Gu
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorZang, Weicheng
dc.contributor.authorCha, Sang-Mok
dc.contributor.authorKim, Dong-Jin
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.authorHan, Cheongho
dc.contributor.authorPogge, Richard W.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorPoleski, Radosław
dc.contributor.authorSkowron, Jan
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.date.accessioned2024-01-25T04:47:58Z
dc.date.available2024-01-25T04:47:58Z
dc.date.copyright2020-10-15
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume161
dc.identifier.doi10.3847/1538-3881/ABD55F
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/110408
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021AJ....161..126R
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages126
dc.rightsOther
dc.sciencecloudnosend
dc.titleKMT-2017-BLG-2820 and the Nature of the Free-floating Planet Population
dc.typeJournalArticle
dspace.entity.typePublication