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Terrestrial- and Neptune-mass Free-Floating Planet Candidates from the MOA-II 9 yr Galactic Bulge Survey

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cris.lastimport.scopus2024-02-12T19:00:16Z
dc.abstract.enWe report the discoveries of low-mass free-floating planet (FFP) candidates from the analysis of 2006-2014 MOA-II Galactic bulge survey data. In this data set, we found 6111 microlensing candidates and identified a statistical sample consisting of 3535 high-quality single-lens events with Einstein radius crossing times in the range 0.057 < t <SUB>E</SUB>/days < 757, including 13 events that show clear finite-source effects with angular Einstein radii of 0.90 < θ <SUB>E</SUB>/μas < 332.54. Two of the 12 events with t <SUB>E</SUB> < 1 day have significant finite-source effects, and one event, MOA-9y-5919, with t <SUB>E</SUB> = 0.057 ± 0.016 days and θ <SUB>E</SUB> = 0.90 ± 0.14 μas, is the second terrestrial-mass FFP candidate to date. A Bayesian analysis indicates a lens mass of ${0.75}_{-0.46}^{+1.23}$ M <SUB>⊕</SUB> for this event. The low detection efficiency for short-duration events implies a large population of low-mass FFPs. The microlensing detection efficiency for low-mass planet events depends on both the Einstein radius crossing times and the angular Einstein radii, so we have used image-level simulations to determine the detection efficiency dependence on both t <SUB>E</SUB> and θ <SUB>E</SUB>. This allows us to use a Galactic model to simulate the t <SUB>E</SUB> and θ <SUB>E</SUB> distribution of events produced by the known stellar populations and models of the FFP distribution that are fit to the data. Methods like this will be needed for the more precise FFP demographics determinations from Nancy Grace Roman Space Telescope data.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorKoshimoto, Naoki
dc.contributor.authorSumi, Takahiro
dc.contributor.authorBennett, David P.
dc.contributor.authorBozza, Valerio
dc.contributor.authorMróz, Przemysław
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorRattenbury, Nicholas J.
dc.contributor.authorAbe, Fumio
dc.contributor.authorBarry, Richard
dc.contributor.authorBhattacharya, Aparna
dc.contributor.authorBond, Ian A.
dc.contributor.authorFujii, Hirosane
dc.contributor.authorFukui, Akihiko
dc.contributor.authorHamada, Ryusei
dc.contributor.authorHirao, Yuki
dc.contributor.authorSilva, Stela Ishitani
dc.contributor.authorItow, Yoshitaka
dc.contributor.authorKirikawa, Rintaro
dc.contributor.authorKondo, Iona
dc.contributor.authorMatsubara, Yutaka
dc.contributor.authorMiyazaki, Shota
dc.contributor.authorMuraki, Yasushi
dc.contributor.authorOlmschenk, Greg
dc.contributor.authorRanc, Clément
dc.contributor.authorSatoh, Yuki
dc.contributor.authorSuzuki, Daisuke
dc.contributor.authorTomoyoshi, Mio
dc.contributor.authorTristram, Paul J.
dc.contributor.authorVandorou, Aikaterini
dc.contributor.authorYama, Hibiki
dc.contributor.authorYamashita, Kansuke
dc.date.accessioned2024-01-26T09:43:38Z
dc.date.available2024-01-26T09:43:38Z
dc.date.copyright2023-08-16
dc.date.issued2023
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number3
dc.description.versionFINAL_PUBLISHED
dc.description.volume166
dc.identifier.doi10.3847/1538-3881/ACE689
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/121719
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2023AJ....166..107K
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages107
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleTerrestrial- and Neptune-mass Free-Floating Planet Candidates from the MOA-II 9 yr Galactic Bulge Survey
dc.typeJournalArticle
dspace.entity.typePublication