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A Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291

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dc.abstract.enWe present the analysis of the planetary microlensing event MOA-2011-BLG-291, which has a mass ratio of q = (3.8 ± 0.7) × 10<SUP>-4</SUP> and a source star that is redder (or brighter) than the bulge main sequence. This event is located at a low Galactic latitude in the survey area that is currently planned for NASA’s Wide Field Infrared Survey Telescope (WFIRST) exoplanet microlensing survey. This unusual color for a microlensed source star implies that we cannot assume that the source star is in the Galactic bulge. The favored interpretation is that the source star is a lower main-sequence star at a distance of D <SUB> S </SUB> = 4.9 ± 1.3 kpc in the Galactic disk. However, the source could also be a turn-off star on the far side of the bulge or a subgiant in the far side of the Galactic disk if it experiences significantly more reddening than the bulge red clump stars. However, these possibilities have only a small effect on our mass estimates for the host star and planet. We find host star and planet masses of {M}<SUB>host</SUB>}={0.15}<SUB>-0.10</SUB><SUP>+0.27</SUP> {M}<SUB>⊙ </SUB> and {m}<SUB>p</SUB>={18}<SUB>-12</SUB><SUP>+34</SUP> {M}<SUB>\oplus </SUB> from a Bayesian analysis with a standard Galactic model, under the assumption that the planet hosting probability does not depend on the host mass or distance. However, if we attempt to measure the host and planet masses with host star brightness measurements from high angular resolution follow-up imaging, the implied masses will be sensitive to the host star distance. The WFIRST exoplanet microlensing survey is expected to use this method to determine the masses for many of the planetary systems that it discovers, so this issue has important design implications for the WFIRST exoplanet microlensing survey.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorBennett, David P.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorBond, Ian A.
dc.contributor.authorSuzuki, Daisuke
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorAbe, Fumio
dc.contributor.authorBarry, Richard K.
dc.contributor.authorBhattacharya, Aparna
dc.contributor.authorDonachie, Martin
dc.contributor.authorFukui, Akihiko
dc.contributor.authorHirao, Yuki
dc.contributor.authorKawasaki, Kohei
dc.contributor.authorKondo, Iona
dc.contributor.authorKoshimoto, Naoki
dc.contributor.authorLi, Man Cheung Alex
dc.contributor.authorMatsubara, Yutaka
dc.contributor.authorMiyazaki, Shota
dc.contributor.authorMuraki, Yasushi
dc.contributor.authorNagakane, Masayuki
dc.contributor.authorOhnishi, Koji
dc.contributor.authorRanc, Clément
dc.contributor.authorRattenbury, Nicholas J.
dc.contributor.authorSuematsu, Haruno
dc.contributor.authorSumi, Takahiro
dc.contributor.authorTristram, Paul J.
dc.contributor.authorYonehara, Atsunori
dc.contributor.authorSzymański, Michał
dc.contributor.authorSoszyński, Igor
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPoleski, Radosław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorMaoz, Dan
dc.contributor.authorKaspi, Shai
dc.contributor.authorFriedmann, Matan
dc.contributor.authorBatista, Virginie
dc.contributor.authorDePoy, Darren
dc.contributor.authorDong, Subo
dc.contributor.authorGaudi, B. Scott
dc.contributor.authorGould, Andrew
dc.contributor.authorHan, Cheongho
dc.contributor.authorPogge, Richard W.
dc.contributor.authorTan, Thiam-Guan
dc.contributor.authorYee, Jennifer C.
dc.date.accessioned2024-01-24T18:05:02Z
dc.date.available2024-01-24T18:05:02Z
dc.date.copyright2018-06-15
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number3
dc.description.versionORIGINAL_AUTHOR
dc.description.volume156
dc.identifier.doi10.3847/1538-3881/AAD59C
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101785
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018AJ....156..113B
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages113
dc.rightsOther
dc.sciencecloudnosend
dc.titleA Planetary Microlensing Event with an Unusually Red Source Star: MOA-2011-BLG-291
dc.typeJournalArticle
dspace.entity.typePublication