Gaia21blx: Complete resolution of a binary microlensing event in the Galactic disk

Simple item page
dc.contributor.authorRota, P.
dc.contributor.authorBozza, V.
dc.contributor.authorHundertmark, M.
dc.contributor.authorBachelet, E.
dc.contributor.authorStreet, R.
dc.contributor.authorTsapras, Y.
dc.contributor.authorCassan, A.
dc.contributor.authorDominik, M.
dc.contributor.authorJaimes, R. Figuera
dc.contributor.authorRybicki, K. A.
dc.contributor.authorWambsganss, J.
dc.contributor.authorWyrzykowski, L.
dc.contributor.authorZielinski, P.
dc.contributor.authorBonavita, M.
dc.contributor.authorHinse, T. C.
dc.contributor.authorJorgensen, U. G.
dc.contributor.authorKhalouei, E.
dc.contributor.authorKorhonen, H.
dc.contributor.authorLonga-Pena, P.
dc.contributor.authorPeixinho, N.
dc.contributor.authorRahvar, S.
dc.contributor.authorSajadian, S.
dc.contributor.authorSkottfelt, J.
dc.contributor.authorSnodgrass, C.
dc.contributor.authorTregolan-Reed, J.
dc.date.accessioned2025-01-20T16:15:14Z
dc.date.available2025-01-20T16:15:14Z
dc.date.issued2024
dc.description.abstractContext. Gravitational microlensing is a method that is used to discover planet-hosting systems at distances of several kiloparsec in the Galactic disk and bulge. We present the analysis of a microlensing event reported by the Gaia photometric alert team that might have a bright lens. Aims. In order to infer the mass and distance to the lensing system, the parallax measurement at the position of Gaia21blx was used. In this particular case, the source and the lens have comparable magnitudes and we cannot attribute the parallax measured by Gaia to the lens or source alone. Methods. Since the blending flux is important, we assumed that the Gaia parallax is the flux-weighted average of the parallaxes of the lens and source. Combining this assumption with the information from the microlensing models and the finite source effects we were able to resolve all degeneracies and thus obtained the mass, distance, luminosities and projected kinematics of the binary lens and the source. Results. According to the best model, the lens is a binary system at 2.18 +/- 0.07 kpc from Earth. It is composed of a G star with 0.95 +/- 0.17 M-circle dot and a K star with 0.53 +/- 0.07 M-circle dot. The source is likely to be an F subgiant star at 2.38 +/- 1.71 kpc with a mass of 1.10 +/- 0.18 M-circle dot. Both lenses and the source follow the kinematics of the thin-disk population. We also discuss alternative models, that are disfavored by the data or by prior expectations, however.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202347807
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202347807
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90484
dc.identifier.wosidWOS:001246762400001
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgravitation
dc.subjectgravitational lensing: micro
dc.subjectcatalogs
dc.subjectparallaxes
dc.subjectproper motions
dc.subjectbinaries: general
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleGaia21blx: Complete resolution of a binary microlensing event in the Galactic disk
dc.typeartículo
dc.volumen686
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
Files
Collections
Artículos de revistas