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Using Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058

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dc.abstract.enWe show that because the conditions for producing terrestrial microlens parallax (TPRX; i.e., a nearby disk lens) will also tend to produce a large lens-source relative proper motion (μ <SUB>rel</SUB>), source proper motion ( μ <SUB>S</SUB>) measurements in general provide a strong test of TPRX signals, which Gould & Yee (2013) showed were an important probe of free-floating planet (FFP) candidates. As a case study, we report a single-lens/single-source microlensing event designated as OGLE-2019-BLG-1058. For this event, the short timescale (~2.5 days) and very fast μ <SUB>rel</SUB> (~17.6 mas yr<SUP>-1</SUP>) suggest that this isolated lens is an FFP candidate located in the disk of our Galaxy. For this event, we find a TPRX signal consistent with a disk FFP, but at low significance. A direct measurement of the μ <SUB>S</SUB> shows that the large μ <SUB>rel</SUB> is due to an extreme μ <SUB>S</SUB>, and thus, the lens is consistent with being a very-low-mass star in the bulge and the TPRX measurement is likely spurious. By contrast, we show how a precise measurement of μ <SUB>S</SUB> with the mean properties of the bulge proper motion distribution would have given the opposite result; i.e., provided supporting evidence for an FFP in the disk and the TPRX measurement.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorPark, Byeong-Gon
dc.contributor.authorKim, Dong-Jin
dc.contributor.authorYee, Jennifer C.
dc.contributor.authorSkowron, Jan
dc.contributor.authorPoleski, Radosław
dc.contributor.authorGould, Andrew
dc.contributor.authorSzymański, Michał
dc.contributor.authorHwang, Kyu-Ha
dc.contributor.authorShin, In-Gu
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorIwanek, Patryk
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorZang, Weicheng
dc.contributor.authorShvartzvald, Yossi
dc.contributor.authorLee, Chung-Uk
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorPogge, Richard W.
dc.contributor.authorKim, Hyoun-Woo
dc.contributor.authorLee, Yongseok
dc.contributor.authorRyu, Yoon-Hyun
dc.contributor.authorJung, Youn Kil
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorCha, Sang-Mok
dc.contributor.authorKim, Seung-Lee
dc.contributor.authorHan, Cheongho
dc.contributor.authorWrona, Marcin
dc.contributor.authorAlbrow, Michael D.
dc.contributor.authorChung, Sun-Ju
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorMróz, Przemysław
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorLee, Dong-Joo
dc.contributor.authorSoszyński, Igor
dc.date.accessioned2024-01-26T11:29:26Z
dc.date.available2024-01-26T11:29:26Z
dc.date.copyright2021-08-05
dc.date.issued2021
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.number6
dc.description.versionORIGINAL_AUTHOR
dc.description.volume162
dc.identifier.doi10.3847/1538-3881/AC2BA5
dc.identifier.issn0004-6256
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/124382
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2021AJ....162..267S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomical Journal
dc.relation.pages267
dc.rightsOther
dc.sciencecloudnosend
dc.titleUsing Source Proper Motion to Validate Terrestrial Parallax: OGLE-2019-BLG-1058
dc.typeJournalArticle
dspace.entity.typePublication