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OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge

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dc.abstract.enWe report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star-planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass of ${M}_{\mathrm{planet}}={3.96}_{-2.66}^{+5.88}{M}_{\oplus }$ . The host star has a mass of ${M}_{\mathrm{host}}={0.12}_{-0.08}^{+0.14}\,{M}_{\odot }$ . The projected separation for the inner and outer solutions are ${0.63}_{-0.17}^{+0.20}$ au and ${0.72}_{-0.19}^{+0.23}$ au respectively. At ${\rm{\Delta }}{\chi }^{2}={\chi }^{2}(1{\rm{L}}1{\rm{S}})-{\chi }^{2}(2{\rm{L}}1{\rm{S}})=46$ , this is by far the lowest Δχ<SUP>2</SUP> for any securely detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a dip rather than a bump.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorHerrera-Martín, Antonio
dc.contributor.authorAlbrow, M. D.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorGould, A.
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorYee, J. C.
dc.contributor.authorChung, S. -J.
dc.contributor.authorHan, C.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorJung, Y. K.
dc.contributor.authorLee, C. -U.
dc.contributor.authorShin, I. -G.
dc.contributor.authorShvartzvald, Y.
dc.contributor.authorZang, W.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorKim, S. -L.
dc.contributor.authorLee, D. -J.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorPogge, R. W.
dc.contributor.authorSzymański, Michał
dc.contributor.authorMróz, Przemysław
dc.contributor.authorSkowron, Jan
dc.contributor.authorPoleski, Radosław
dc.contributor.authorSoszyński, Igor
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorWrona, Marcin
dc.date.accessioned2024-01-25T15:42:18Z
dc.date.available2024-01-25T15:42:18Z
dc.date.copyright2020-03-06
dc.date.issued2020
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number6
dc.description.versionORIGINAL_AUTHOR
dc.description.volume159
dc.identifier.doi10.3847/1538-3881/AB893E
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114525
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2020AJ....159..256H
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages256
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge
dc.typeJournalArticle
dspace.entity.typePublication