J/ApJ/897/180ivo://CDS.VizieR/J/ApJ/897/180doi:10.26093/cds/vizier.18970180CDSZang W.Dong S.Gould A.Calchi Novati S.Chen P.Yang H.Li S.-S.,Mao S.Alton K.B.Brimacombe J.Carey S.Christie G.W.,Delplancke-Strobele F.Feliz D.L.Gaudi B.S.Green J.Hu S.,Jayasinghe T.Koff R.A.Kurtenkov A.Merand A.Minev M.Mutel R.,Natusch T.Roth T.Shvartzvald Y.Sun F.Vanmunster T.Zhu W.2022-03-16T12:48:14Z2021-10-15T06:57:16ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frgravitational-lensinginfrared-photometryvisible-astronomybroad-band-photometryWe report the lens mass and distance measurements of the nearby microlensing event TCPJ05074264+2447555 (Kojima-1). We measure the microlens parallax vector {pi}_E_ using Spitzer and ground-based light curves with constraints on the direction of lens-source relative proper motion derived from Very Large Telescope Interferometer (VLTI) GRAVITY observations. Combining this {pi}_E_ determination with the angular Einstein radius {theta}_E_ measured by VLTI-GRAVITY observations, we find that the lens is a star with mass M_L_=0.495{+/-}0.063M{odot} at a distance DL=429{+/-}21pc. We find that the blended light basically all comes from the lens. The lens-source proper motion is {mu}_rel,hel_=26.55{+/-}0.36mas/yr, so with currently available adaptive-optics instruments, the lens and source can be resolved in 2021. This is the first microlensing event whose lens mass is unambiguously measured by interferometry+satellite-parallax observations, which opens a new window for mass measurements of isolated objects such as stellar-mass black holes.2020ApJ...897..180Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/897/180CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)II/366 : ASAS-SN catalog of variable stars (Jayasinghe+, 2018-2020)J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)J/ApJ/814/92 : Spitzer IRAC events observed in crowded fields (Calchi+, 2015)J/MNRAS/458/3012 : OGLE-III Parallax microlensing events (Wyrzykowski+, 2016)J/AJ/154/210 : 2015 high-cadence Spitzer microlensing events (Zhu+, 2017)J/ApJ/891/3 : Follow-up LCs of 2 Spitzer microlensing events (Zang+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/897/180https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/897/180http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/897/180https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/897/180https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/897/180http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/897/180GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/ApJ/897/180/fig1The light curves and data points of Kojima-1BandPassbandinstr.bandpasscharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObsObservatory identifier (1)meta.id;instr.obstycharJD[2457832/2458157] Julian Date (2)dtime.epochdoublemag[9.53/153] Observed magnitude in Band (3)magphot.magfloate_mag[0.002/0.3] Uncertainty in magmagstat.error;phot.magfloat