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Ground-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020

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dc.abstract.enWe present the analysis of the binary gravitational microlensing event MOA-2015-BLG-020. The event has a fairly long timescale (˜63 days) and thus the light curve deviates significantly from the lensing model that is based on the rectilinear lens-source relative motion. This enables us to measure the microlensing parallax through the annual parallax effect. The microlensing parallax parameters constrained by the ground-based data are confirmed by the Spitzer observations through the satellite parallax method. By additionally measuring the angular Einstein radius from the analysis of the resolved caustic crossing, the physical parameters of the lens are determined. It is found that the binary lens is composed of two dwarf stars with masses {M}<SUB>1</SUB>=0.606+/- 0.028 {M}<SUB>⊙ </SUB> and {M}<SUB>2</SUB>=0.125 +/- 0.006 {M}<SUB>⊙ </SUB> in the Galactic disk. Assuming that the source star is at the same distance as the bulge red clump stars, we find the lens is at a distance {D}<SUB>L</SUB>=2.44+/- 0.10 {kpc}. We also provide a summary and short discussion of all of the published microlensing events in which the annual parallax effect is confirmed by other independent observations.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSkowron, Jan
dc.contributor.authorSoszyński, Igor
dc.contributor.authorSzymański, Michał
dc.contributor.authorWang, Tianshu
dc.contributor.authorZhu, Wei
dc.contributor.authorMao, Shude
dc.contributor.authorBond, I. A.
dc.contributor.authorGould, A.
dc.contributor.authorSumi, T.
dc.contributor.authorBozza, V.
dc.contributor.authorRanc, C.
dc.contributor.authorCassan, A.
dc.contributor.authorYee, J. C.
dc.contributor.authorHan, C.
dc.contributor.authorAbe, F.
dc.contributor.authorAsakura, Y.
dc.contributor.authorBarry, R.
dc.contributor.authorBennett, D. P.
dc.contributor.authorBhattacharya, A.
dc.contributor.authorDonachie, M.
dc.contributor.authorEvans, P.
dc.contributor.authorFukui, A.
dc.contributor.authorHirao, Y.
dc.contributor.authorItow, Y.
dc.contributor.authorKawasaki, K.
dc.contributor.authorKoshimoto, N.
dc.contributor.authorLi, M. C. A.
dc.contributor.authorLing, C. H.
dc.contributor.authorMasuda, K.
dc.contributor.authorMatsubara, Y.
dc.contributor.authorMiyazaki, S.
dc.contributor.authorMuraki, Y.
dc.contributor.authorNagakane, M.
dc.contributor.authorOhnishi, K.
dc.contributor.authorRattenbury, N.
dc.contributor.authorSaito, To.
dc.contributor.authorSharan, A.
dc.contributor.authorShibai, H.
dc.contributor.authorSullivan, D. J.
dc.contributor.authorSuzuki, D.
dc.contributor.authorTristram, P. J.
dc.contributor.authorYamada, T.
dc.contributor.authorYonehara, A.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorPawlak, Michał
dc.contributor.authorPoleski, Radosław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorBeichman, C.
dc.contributor.authorBryden, G.
dc.contributor.authorNovati, S. Calchi
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.contributor.authorAlbrow, M. D.
dc.contributor.authorChung, S. -J.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorJung, Y. K.
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorShin, I. -G.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorKim, S. -L.
dc.contributor.authorLee, C. -U.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorPogge, R. W.
dc.contributor.authorStreet, R. A.
dc.contributor.authorTsapras, Y.
dc.contributor.authorHundertmark, M.
dc.contributor.authorBachelet, E.
dc.contributor.authorDominik, M.
dc.contributor.authorHorne, K.
dc.contributor.authorJaimes, R. Figuera
dc.contributor.authorWambsganss, J.
dc.contributor.authorBramich, D. M.
dc.contributor.authorSchmidt, R.
dc.contributor.authorSnodgrass, C.
dc.contributor.authorSteele, I. A.
dc.contributor.authorMenzies, J.
dc.date.accessioned2024-01-25T02:28:25Z
dc.date.available2024-01-25T02:28:25Z
dc.date.copyright2017-07-24
dc.date.issued2017
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number2
dc.description.versionORIGINAL_AUTHOR
dc.description.volume845
dc.identifier.doi10.3847/1538-4357/AA813B
dc.identifier.issn0004-637X
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/108176
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2017ApJ...845..129W
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstrophysical Journal
dc.relation.pages129
dc.rightsOther
dc.sciencecloudnosend
dc.titleGround-based Parallax Confirmed by Spitzer: Binary Microlensing Event MOA-2015-BLG-020
dc.typeJournalArticle
dspace.entity.typePublication