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OGLE-2017-BLG-1522: A Giant Planet around a Brown Dwarf Located in the Galactic Bulge

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dc.abstract.enWe report the discovery of a giant planet in the OGLE-2017-BLG-1522 microlensing event. The planetary perturbations were clearly identified by high-cadence survey experiments despite the relatively short event timescale of t <SUB>E</SUB> ˜ 7.5 days. The Einstein radius is unusually small, θ <SUB>E</SUB> = 0.065 mas, implying that the lens system either has very low mass or lies much closer to the microlensed source than the Sun, or both. A Bayesian analysis yields component masses ({M}<SUB>host</SUB>},{M}<SUB>planet</SUB>})=({46}<SUB>-25</SUB><SUP>+79</SUP>,{0.75}<SUB>-0.40</SUB><SUP>+1.26</SUP>) {M}<SUB>{{J</SUB>}} and source-lens distance {D}<SUB>LS</SUB>}={0.99}<SUB>-0.54</SUB><SUP>+0.91</SUP> {kpc}, implying that this is a brown-dwarf/Jupiter system that probably lies in the Galactic bulge, a location that is also consistent with the relatively low lens-source relative proper motion μ = 3.2 ± 0.5 mas yr<SUP>-1</SUP>. The projected companion-host separation is {0.59}<SUB>-0.11</SUB><SUP>+0.12</SUP> {au}, indicating that the planet is placed beyond the snow line of the host, i.e., a <SUB> sl </SUB> ˜ 0.12 au. Planet formation scenarios combined with the small companion-host mass ratio q ˜ 0.016 and separation suggest that the companion could be the first discovery of a giant planet that formed in a protoplanetary disk around a brown-dwarf host.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorJung, Y. K.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorGould, A.
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorYee, J. C.
dc.contributor.authorHan, C.
dc.contributor.authorAlbrow, M. D.
dc.contributor.authorLee, C. -U.
dc.contributor.authorKim, S. -L.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorChung, S. -J.
dc.contributor.authorShin, I. -G.
dc.contributor.authorZhu, W.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorLee, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorPogge, R. W.
dc.contributor.authorSzymański, Michał
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPoleski, Radosław
dc.contributor.authorSkowron, Jan
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSoszyński, Igor
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.contributor.authorRybicki, Krzysztof
dc.date.accessioned2024-01-25T15:41:58Z
dc.date.available2024-01-25T15:41:58Z
dc.date.copyright2018-03-14
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number5
dc.description.versionORIGINAL_AUTHOR
dc.description.volume155
dc.identifier.doi10.3847/1538-3881/AABB51
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114520
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018AJ....155..219J
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages219
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2017-BLG-1522: A Giant Planet around a Brown Dwarf Located in the Galactic Bulge
dc.typeJournalArticle
dspace.entity.typePublication