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MOA-bin-29b: A Microlensing Gas-giant Planet Orbiting a Low-mass Host Star

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cris.lastimport.scopus2024-02-12T20:26:41Z
dc.abstract.enWe report the discovery of a gas-giant planet orbiting a low-mass host star in the microlensing event MOA-bin-29 that occurred in 2006. We find five degenerate solutions with the planet/host-star mass ratio of q ˜ 10<SUP>-2</SUP>. The Einstein radius crossing time of all models are relatively short (˜4-7 days), which indicates that the mass of host star is likely low. The measured lens-source proper motion is 5-9 mas yr<SUP>-1</SUP> depending on the models. Since only finite source effects are detected, we conduct a Bayesian analysis in order to obtain the posterior probability distribution of the lens physical properties. As a result, we find the lens system is likely to be a gas-giant orbiting a brown dwarf or a very late M-dwarf in the Galactic bulge. The probability distributions of the physical parameters for the five degenerate models are consistent within the range of error. By combining these probability distributions, we conclude that the lens system is a gas giant with a mass of {M}<SUB>{{p</SUB>}}={0.63}<SUB>-0.39</SUB><SUP>+1.13</SUP> {M}<SUB>Jup</SUB>} orbiting a brown dwarf with a mass of {M}<SUB>{{h</SUB>}}={0.06}<SUB>-0.04</SUB><SUP>+0.11</SUP> {M}<SUB>⊙ </SUB> at a projected star-planet separation of {r}<SUB>\perp </SUB>={0.53}<SUB>-0.18</SUB><SUP>+0.89</SUP> {au}. The lens distance is {D}<SUB>{{L</SUB>}}={6.89}<SUB>-1.19</SUB><SUP>+1.19</SUP> {kpc}, i.e., likely within the Galactic bulge.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKondo, Iona
dc.contributor.authorSumi, Takahiro
dc.contributor.authorBennett, David P.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorBond, Ian A.
dc.contributor.authorRattenbury, Nicholas J.
dc.contributor.authorBozza, Valerio
dc.contributor.authorHirao, Yuki
dc.contributor.authorSuzuki, Daisuke
dc.contributor.authorKoshimoto, Naoki
dc.contributor.authorNagakane, Masayuki
dc.contributor.authorMiyazaki, Shota
dc.contributor.authorAbe, F.
dc.contributor.authorBarry, R.
dc.contributor.authorBhattacharya, A.
dc.contributor.authorDonachie, M.
dc.contributor.authorFukui, A.
dc.contributor.authorFujii, H.
dc.contributor.authorItow, Y.
dc.contributor.authorKamei, Y.
dc.contributor.authorLi, M. C. A.
dc.contributor.authorMatsubara, Y.
dc.contributor.authorMatsuo, T.
dc.contributor.authorMuraki, Y.
dc.contributor.authorRanc, C.
dc.contributor.authorShibai, H.
dc.contributor.authorSuematsu, H.
dc.contributor.authorSullivan, D. J.
dc.contributor.authorTristram, P. J.
dc.contributor.authorYamakawa, T.
dc.contributor.authorYonehara, A.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorUlaczyk, Krzysztof
dc.date.accessioned2024-01-25T12:46:11Z
dc.date.available2024-01-25T12:46:11Z
dc.date.copyright2019-05-03
dc.date.issued2019
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number6
dc.description.versionORIGINAL_AUTHOR
dc.description.volume158
dc.identifier.doi10.3847/1538-3881/AB4E9E
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/112719
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2019AJ....158..224K
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages224
dc.rightsOther
dc.sciencecloudnosend
dc.titleMOA-bin-29b: A Microlensing Gas-giant Planet Orbiting a Low-mass Host Star
dc.typeJournalArticle
dspace.entity.typePublication