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A possible nearby microlensing stellar remnant hiding in Gaia DR3 astrometry

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cris.lastimport.scopus2024-02-12T20:12:31Z
dc.abstract.enMassive galactic lenses with large Einstein Radii should cause a measurable astrometric microlensing effect, that is, a light centroid shift due to the motion of the two images. Such a shift in the position of a background star due to microlensing was not included in the Gaia astrometric model, and therefore significant deviation should cause Gaia's astrometric parameters to be determined incorrectly. Here we study one of the photometric microlensing events reported in the Gaia Data Release 3, GaiaDR3-ULENS-001, for which a poor goodness of Gaia fit and erroneous parallax could indicate the presence of an astrometric microlensing signal. Based on the photometric microlensing model, we simulated Gaia astrometric time series with the astrometric microlensing effect added. We find that including microlensing with an angular Einstein radius of θ<SUB>E</SUB> = 2.60<SUB>−0.24</SUB><SUP>+0.21</SUP> mas (2.47<SUB>−0.24</SUB><SUP>+0.28</SUP> mas) assuming a positive (negative) impact parameter, u<SUB>0</SUB>, reproduces the astrometric quantities reported by Gaia well. We estimate the mass of the lens to be 1.00<SUB>−0.18</SUB><SUP>+0.23</SUP> M<SUB>⊙</SUB> (0.70<SUB>−0.13</SUB><SUP>+0.17</SUP> M<SUB>⊙</SUB>) and its distance 0.90<SUB>−0.11</SUB><SUP>+0.14</SUP> kpc (0.69<SUB>−0.09</SUB><SUP>+0.13</SUP> kpc), proposing the lens could be a nearby isolated white dwarf.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorJabłońska, Maja
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorKruszyńska, Katarzyna
dc.contributor.authorKaczmarek, Zofia
dc.contributor.authorPenoyre, Zephyr
dc.date.accessioned2024-01-24T18:05:55Z
dc.date.available2024-01-24T18:05:55Z
dc.date.copyright2022-10-24
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionFINAL_PUBLISHED
dc.description.volume666
dc.identifier.doi10.1051/0004-6361/202244656
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/101794
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022A&A...666L..16J
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesL16
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleA possible nearby microlensing stellar remnant hiding in Gaia DR3 astrometry
dc.typeJournalArticle
dspace.entity.typePublication