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Toward a Galactic Distribution of Planets. I. Methodology and Planet Sensitivities of the 2015 High-cadence Spitzer Microlens Sample

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dc.abstract.enWe analyze an ensemble of microlensing events from the 2015 Spitzer microlensing campaign, all of which were densely monitored by ground-based high-cadence survey teams. The simultaneous observations from Spitzer and the ground yield measurements of the microlensing parallax vector π<SUB>E</SUB>, from which compact constraints on the microlens properties are derived, including ≲25% uncertainties on the lens mass and distance. With the current sample, we demonstrate that the majority of microlenses are indeed in the mass range of M dwarfs. The planet sensitivities of all 41 events in the sample are calculated, from which we provide constraints on the planet distribution function. In particular, assuming a planet distribution function that is uniform in log q, where q is the planet-to-star mass ratio, we find a 95% upper limit on the fraction of stars that host typical microlensing planets of 49%, which is consistent with previous studies. Based on this planet-free sample, we develop the methodology to statistically study the Galactic distribution of planets using microlensing parallax measurements. Under the assumption that the planet distributions are the same in the bulge as in the disk, we predict that ˜1/3 of all planet detections from the microlensing campaigns with Spitzer should be in the bulge. This prediction will be tested with a much larger sample, and deviations from it can be used to constrain the abundance of planets in the bulge relative to the disk.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorZhu, Wei
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorNovati, S. Calchi
dc.contributor.authorChung, S. -J.
dc.contributor.authorJung, Y. K.
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorShin, I. -G.
dc.contributor.authorGould, A.
dc.contributor.authorLee, C. -U.
dc.contributor.authorAlbrow, M. D.
dc.contributor.authorYee, J. C.
dc.contributor.authorHan, C.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorKim, S. -L.
dc.contributor.authorKim, Y. -H.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorPogge, R. W.
dc.contributor.authorPoleski, Radosław
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorSzymański, Michał
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.contributor.authorBeichman, C.
dc.contributor.authorBryden, G.
dc.contributor.authorCarey, S.
dc.contributor.authorFausnaugh, M.
dc.contributor.authorGaudi, B. S.
dc.contributor.authorHenderson, C. B.
dc.contributor.authorShvartzvald, Y.
dc.contributor.authorWibking, B.
dc.date.accessioned2024-01-26T11:04:02Z
dc.date.available2024-01-26T11:04:02Z
dc.date.copyright2017-01-18
dc.date.issued2017
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number5
dc.description.versionORIGINAL_AUTHOR
dc.description.volume154
dc.identifier.doi10.3847/1538-3881/AA8EF1
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/123574
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2017AJ....154..210Z
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages210
dc.rightsOther
dc.sciencecloudnosend
dc.titleToward a Galactic Distribution of Planets. I. Methodology and Planet Sensitivities of the 2015 High-cadence Spitzer Microlens Sample
dc.typeJournalArticle
dspace.entity.typePublication