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Two new free-floating or wide-orbit planets from microlensing

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cris.lastimport.scopus2024-02-12T20:51:42Z
dc.abstract.enPlanet formation theories predict the existence of free-floating planets that have been ejected from their parent systems. Although they emit little or no light, they can be detected during gravitational microlensing events. Microlensing events caused by rogue planets are characterized by very short timescales t<SUB>E</SUB> (typically below two days) and small angular Einstein radii θ<SUB>E</SUB> (up to several μas). Here we present the discovery and characterization of two ultra-short microlensing events identified in data from the Optical Gravitational Lensing Experiment (OGLE) survey, which may have been caused by free-floating or wide-orbit planets. OGLE-2012-BLG-1323 is one of the shortest events discovered thus far (t<SUB>E</SUB> = 0.155 ± 0.005 d, θ<SUB>E</SUB> = 2.37 ± 0.10μas) and was caused by an Earth-mass object in the Galactic disk or a Neptune-mass planet in the Galactic bulge. OGLE-2017-BLG-0560 (t<SUB>E</SUB> = 0.905 ± 0.005 d, θ<SUB>E</SUB> = 38.7 ± 1.6μas) was caused by a Jupiter-mass planet in the Galactic disk or a brown dwarf in the bulge. We rule out stellar companions up to a distance of 6.0 and 3.9 au, respectively. We suggest that the lensing objects, whether located on very wide orbits or free-floating, may originate from the same physical mechanism. Although the sample of ultrashort microlensing events is small, these detections are consistent with low-mass wide-orbit or unbound planets being more common than stars in the Milky Way.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorSkowron, Jan
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorSzymański, Michał
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorSoszyński, Igor
dc.contributor.authorMróz, Przemysław
dc.contributor.authorBennett, David P.
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorSumi, Takahiro
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorPoleski, Radosław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorGould, Andrew
dc.contributor.authorHan, Cheongho
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorJung, Youn Kil
dc.contributor.authorShin, In-Gu
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.contributor.authorAbe, Fumio
dc.contributor.authorBarry, Richard
dc.contributor.authorBhattacharya, Aparna
dc.contributor.authorBond, Ian A.
dc.contributor.authorDonachie, Martin
dc.contributor.authorFukui, Akihiko
dc.contributor.authorHirao, Yuki
dc.contributor.authorItow, Yoshitaka
dc.contributor.authorKawasaki, Kohei
dc.contributor.authorKondo, Iona
dc.contributor.authorKoshimoto, Naoki
dc.contributor.authorLi, Man Cheung Alex
dc.contributor.authorMatsubara, Yutaka
dc.contributor.authorMuraki, Yasushi
dc.contributor.authorMiyazaki, Shota
dc.contributor.authorNagakane, Masayuki
dc.contributor.authorRanc, Clément
dc.contributor.authorRattenbury, Nicholas J.
dc.contributor.authorSuematsu, Haruno
dc.contributor.authorSullivan, Denis J.
dc.contributor.authorSuzuki, Daisuke
dc.contributor.authorTristram, Paul J.
dc.contributor.authorYonehara, Atsunori
dc.contributor.authorMaoz, Dan
dc.contributor.authorKaspi, Shai
dc.contributor.authorFriedmann, Matan
dc.date.accessioned2024-01-26T11:09:07Z
dc.date.available2024-01-26T11:09:07Z
dc.date.copyright2018-11-01
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.versionORIGINAL_AUTHOR
dc.description.volume622
dc.identifier.doi10.1051/0004-6361/201834557
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123969
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019A&A...622A.201M
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesA201
dc.rightsOther
dc.sciencecloudnosend
dc.titleTwo new free-floating or wide-orbit planets from microlensing
dc.typeJournalArticle
dspace.entity.typePublication