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OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling

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cris.lastimport.scopus2024-02-12T19:36:36Z
dc.abstract.enWe report the discovery of the planet OGLE-2018-BLG-0532Lb, with very obvious signatures in the light curve that lead to an estimate of the planet-host mass ratio $q={M}_{\mathrm{planet}}/{M}_{\mathrm{host}}\simeq 1\times {10}^{-4}$ . Ahough there are no obvious systematic residuals to this double-lens/single-source (2L1S) fit, we find that χ<SUP>2</SUP> can be significantly improved by adding either a third lens (3L1S, Δχ<SUP>2</SUP> = 81) or second source (2L2S, Δχ<SUP>2</SUP> = 77) to the lens-source geometry. After thorough investigation, we conclude that we cannot decisively distinguish between these two scenarios and therefore focus on the robustly detected planet. However, given the possible presence of a second planet, we investigate to what degree and with what probability such additional planets may affect seemingly single-planet light curves. Our best estimates for the properties of the lens star and the secure planet are a host mass M ˜ 0.25 M<SUB>⊙</SUB>, system distance D<SUB>L</SUB> ˜ 1 kpc, and planet mass ${m}_{p,1}=8\,{M}_{\oplus }$ with projected separation ${a}_{1,\perp }=1.4\,\mathrm{au}$ . However, there is a relatively bright I = 18.6 (and also relatively blue) star projected within $\ 50\,\mathrm{mas}$ of the lens, and if future high-resolution images show that this is coincident with the lens, then it is possible that it is the lens, in which case, the lens would be both more massive and more distant than the best-estimated values above.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorPenny, Matthew T.
dc.contributor.authorZang, Weicheng
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.authorShvartzvald, Yossi
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.authorMróz, Przemysław
dc.contributor.authorSzymański, Michał
dc.contributor.authorSkowron, Jan
dc.contributor.authorPoleski, Radosław
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.contributor.authorWrona, Marcin
dc.contributor.authorMao, Shude
dc.contributor.authorFouque, Pascal
dc.contributor.authorZhu, Wei
dc.contributor.authorWang, Tianshu
dc.date.accessioned2024-01-25T15:42:08Z
dc.date.available2024-01-25T15:42:08Z
dc.date.copyright2019-05-15
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number4
dc.description.versionORIGINAL_AUTHOR
dc.description.volume160
dc.identifier.doi10.3847/1538-3881/ABAA3F
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114522
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020AJ....160..183R
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages183
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling
dc.typeJournalArticle
dspace.entity.typePublication