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Lens parameters for Gaia18cbf - a long gravitational microlensing event in the Galactic plane

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cris.lastimport.scopus2024-02-12T20:15:39Z
dc.abstract.enContext. The timescale of a microlensing event scales as a square root of a lens mass. Therefore, long-lasting events are important candidates for massive lenses, including black holes. Aims: Here, we present the analysis of the Gaia18cbf microlensing event reported by the Gaia Science Alerts system. It exhibited a long timescale and features that are common for the annual microlensing parallax effect. We deduce the parameters of the lens based on the derived best fitting model. Methods: We used photometric data collected by the Gaia satellite as well as the follow-up data gathered by the ground-based observatories. We investigated the range of microlensing models and used them to derive the most probable mass and distance to the lens using a Galactic model as a prior. Using a known mass-brightness relation, we determined how likely it is that the lens is a main-sequence (MS) star. Results: This event is one of the longest ever detected, with the Einstein timescale of t<SUB>E</SUB> = 491.41<SUB>−84.94</SUB><SUP>+128.31</SUP> days for the best solution and t<SUB>E</SUB> = 453.74<SUB>−105.74</SUB><SUP>+178.69</SUP> days for the second best. Assuming Galaxy priors, this translates to the most probable lens masses of M<SUB>L</SUB> = 2.65<SUB>−1.48</SUB><SUP>+5.09</SUP> M<SUB>⊙</SUB> and M<SUB>L</SUB> = 1.71<SUB>−1.06</SUB><SUP>+3.78</SUP> M<SUB>⊙</SUB>, respectively. The limits on the blended light suggest that this event was most likely not caused by a MS star, but rather by a dark remnant of stellar evolution. Full Table A.1 is only and Table A.2 is also available at the CDS via anonymous ftp to <A href=http://cdsarc.u-strasbg.fr/">cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/662/A59">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/662/A59</A>"
dc.affiliationUniwersytet Warszawski
dc.contributor.authorWyrzykowski, Łukasz
dc.contributor.authorČepas, V.
dc.contributor.authorStreet, R.
dc.contributor.authorBozza, V.
dc.contributor.authorJabłonowska, A.
dc.contributor.authorJaimes, R. Figuera
dc.contributor.authorJabłońska, M.
dc.contributor.authorZieliński, Paweł
dc.contributor.authorIhanec, Nada
dc.contributor.authorDominik, M.
dc.contributor.authorTsapras, Y.
dc.contributor.authorKaczmarek, Z.
dc.contributor.authorZdanavičius, J.
dc.contributor.authorFukui, A.
dc.contributor.authorŠiškauskaitė, K.
dc.contributor.authorHodgkin, S. T.
dc.contributor.authorHundertmark, M.
dc.contributor.authorGromadzki, Mariusz
dc.contributor.authorRattenbury, N.
dc.contributor.authorHowil, K.
dc.contributor.authorNarita, N.
dc.contributor.authorBronikowski, M.
dc.contributor.authorBachelet, E.
dc.contributor.authorKruszyńska, Katarzyna
dc.contributor.authorMaskoliūnas, M.
dc.contributor.authorStankevičiūtė, Algita
dc.contributor.authorZiółkowska, O.
dc.contributor.authorPakštienė, E.
dc.contributor.authorMikołajczyk, P.
dc.contributor.authorMróz, Przemysław
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorGezer, Ilknur
dc.date.accessioned2024-01-25T05:08:38Z
dc.date.available2024-01-25T05:08:38Z
dc.date.copyright2022-06-14
dc.date.issued2022
dc.description.accesstimeAT_PUBLICATION
dc.description.financePublikacja bezkosztowa
dc.description.versionFINAL_PUBLISHED
dc.description.volume662
dc.identifier.doi10.1051/0004-6361/202142602
dc.identifier.issn0004-6361
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/111081
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2022A&A...662A..59K
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofAstronomy and Astrophysics
dc.relation.pagesA59
dc.rightsCC-BY
dc.sciencecloudnosend
dc.titleLens parameters for Gaia18cbf - a long gravitational microlensing event in the Galactic plane
dc.typeJournalArticle
dspace.entity.typePublication