OGLE-2015-BLG-0845L: a low-mass M dwarf from the microlensing parallax and xallarap effects

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dc.citation.issue2
dc.citation.volume533
dc.contributor.authorHu Z
dc.contributor.authorZhu W
dc.contributor.authorGould A
dc.contributor.authorUdalski A
dc.contributor.authorSumi T
dc.contributor.authorChen P
dc.contributor.authorCalchi Novati S
dc.contributor.authorYee JC
dc.contributor.authorBeichman CA
dc.contributor.authorBryden G
dc.contributor.authorCarey S
dc.contributor.authorFausnaugh M
dc.contributor.authorScott Gaudi B
dc.contributor.authorHenderson CB
dc.contributor.authorShvartzvald Y
dc.contributor.authorWibking B
dc.contributor.authorMroz P
dc.contributor.authorSkowron J
dc.contributor.authorPoleski R
dc.contributor.authorSzymanski MK
dc.contributor.authorSoszynski I
dc.contributor.authorPietrukowicz P
dc.contributor.authorKozłowski S
dc.contributor.authorUlaczyk K
dc.contributor.authorRybicki KA
dc.contributor.authorIwanek P
dc.contributor.authorWrona M
dc.contributor.authorGromadzki MG
dc.contributor.authorAbe F
dc.contributor.authorBarry R
dc.contributor.authorBennett DP
dc.contributor.authorBhattacharya A
dc.contributor.authorBond IA
dc.contributor.authorFujii H
dc.contributor.authorFukui A
dc.contributor.authorHamada R
dc.contributor.authorHirao Y
dc.contributor.authorSilva SI
dc.contributor.authorItow Y
dc.contributor.authorKirikawa R
dc.contributor.authorKoshimoto N
dc.contributor.authorMatsubara Y
dc.contributor.authorMiyazaki S
dc.contributor.authorMuraki Y
dc.contributor.authorOlmschenk G
dc.contributor.authorRanc C
dc.contributor.authorRattenbury NJ
dc.contributor.authorSatoh Y
dc.contributor.authorSuzuki D
dc.contributor.authorTomoyoshi M
dc.contributor.authorTristram PJ
dc.contributor.authorVandorou A
dc.contributor.authorYama H
dc.contributor.authorYamashita K
dc.date.accessioned2024-10-20T22:58:22Z
dc.date.available2024-10-20T22:58:22Z
dc.date.issued2024-09-01
dc.description.abstractWe present the analysis of the microlensing event OGLE-2015-BLG-0845, which was affected by both the microlensing parallax and xallarap effects. The former was detected via the simultaneous observations from the ground and Spitzer, and the latter was caused by the orbital motion of the source star in a relatively close binary. The combination of these two effects led to a mass measurement of the lens object, revealing a low-mass (0.14 ± 0.05 M) M dwarf at the bulge distance (7.6 ± 1.0 kpc). The source binary consists of a late F-type subgiant and a K-type dwarf of ∼ 1.2 and ∼ 0.9M, respectively, and the orbital period is 70 ± 10 d. OGLE-2015-BLG-0845 is the first single-lens event in which the lens mass is measured via the binarity of the source. Given the abundance of binary systems as potential microlensing sources, the xallarap effect may not be a rare phenomenon. Our work thus highlights the application of the xallarap effect in the mass determination of microlenses, and the same method can be used to identify isolated dark lenses.
dc.description.confidentialfalse
dc.edition.editionSeptember 2024
dc.format.pagination1991-2004
dc.identifier.citationHu Z, Zhu W, Gould A, Udalski A, Sumi T, Chen P, Calchi Novati S, Yee JC, Beichman CA, Bryden G, Carey S, Fausnaugh M, Scott Gaudi B, Henderson CB, Shvartzvald Y, Wibking B, Mroz P, Skowron J, Poleski R, Szymanski MK, Soszynski I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Wrona M, Gromadzki M, Abe F, Barry R, Bennett DP, Bhattacharya A, Bond IA, Fujii H, Fukui A, Hamada R, Hirao Y, Silva SI, Itow Y, Kirikawa R, Koshimoto N, Matsubara Y, Miyazaki S, Muraki Y, Olmschenk G, Ranc C, Rattenbury NJ, Satoh Y, Suzuki D, Tomoyoshi M, Tristram PJ, Vandorou A, Yama H, Yamashita K. (2024). OGLE-2015-BLG-0845L: a low-mass M dwarf from the microlensing parallax and xallarap effects. Monthly Notices of the Royal Astronomical Society. 533. 2. (pp. 1991-2004).
dc.identifier.doi10.1093/mnras/stae1906
dc.identifier.eissn1365-2966
dc.identifier.elements-typejournal-article
dc.identifier.issn0035-8711
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/71771
dc.languageEnglish
dc.publisherOxford University Press
dc.publisher.urihttps://academic.oup.com/mnras/article/533/2/1991/7729272
dc.relation.isPartOfMonthly Notices of the Royal Astronomical Society
dc.rights(c) The author/sen
dc.rights.licenseCC BYen
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en
dc.subjectgravitational lensing
dc.subjectmicro – methods
dc.subjectdata analysis – binaries
dc.subjectgeneral
dc.titleOGLE-2015-BLG-0845L: a low-mass M dwarf from the microlensing parallax and xallarap effects
dc.typeJournal article
pubs.elements-id491404
pubs.organisational-groupOther
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