J/AcA/68/351ivo://CDS.VizieR/J/AcA/68/351doi:10.26093/cds/vizier.120680351CDSNielsen M.B.Bramich D.M.2025-09-25T20:16:27Z2019-05-10T07:42:45ZCDS support team

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

cds-question@unistra.frgravitational-lensingastrometryMicrolensing events can be used to directly measure the masses of single field stars to a precision of ~1-10%. The majority of direct mass measurements for stellar and sub-stellar objects typically only come from observations of binary systems. Hence microlensing provides an important channel for direct mass measurements of single stars. The Gaia satellite has observed ~1.7 billion objects, and analysis of the second data release has recently yielded numerous event predictions for the next few decades. However, the Gaia catalog is incomplete for nearby very-low-mass objects such as brown dwarfs for which mass measurements are most crucial. We employ a catalog of very-low-mass objects from Pan-STARRS data release 1 (PDR1) as potential lens stars, and we use the objects from Gaia data release 2 (GDR2) as potential source stars. We then search for future microlensing events up to the year 2070. The Pan-STARRS1 objects are first cross-matched with GDR2 to remove any that are present in both catalogs. This leaves a sample of 1718 possible lenses. We fit MIST isochrones to the Pan-STARRS1, AllWISE and 2MASS photometry to estimate their masses. We then compute their paths on the sky, along with the paths of the GDR2 source objects, until the year 2070, and search for potential microlensing events. Source-lens pairs that will produce a microlensing signal with an astrometric amplitude of greater than 0.131mas, or a photometric amplitude of greater than 0.4mmag, are retained.2018AcA....68..351Nhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AcA/68/351CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)J/A+A/618/A44 : Predicted microlensing events from Gaia DR2 (Bramich, 2018)J/AcA/68/183 : Predicted Microlensing Events for 21st Century (Bramich+, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AcA/68/351https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AcA/68/351http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AcA/68/351https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AcA/68/351https://vizier.iucaa.in/viz-bin/votable?-source=J/AcA/68/351http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AcA/68/351GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AcA/68/351/events (Characteristics of 27 microlensing events)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AcA/68/351/events?https://vizier.iucaa.in/viz-bin/conesearch/J/AcA/68/351/events?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AcA/68/351/events?GETtext/xml+votable180.050000true76.710106519452.60678286580.0055555555555555566/1890 3005 7814 14351 14638 14772 15660 20713 21296 22996 28847 30505 31863 39807 44226 444861.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AcA/68/351?format=asciidefaultJ/AcA/68/351/eventsCharacteristics of 27 microlensing eventsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEventEvent Name (MENNN)meta.id;meta.maincharSpTypeLLens spectral typesrc.spTypecharDiscLens discovery IDmeta.idcharPS1LLens PS1 DR1 IDmeta.idcharGDR2L? Lens GDR2 IDmeta.idnullableRALdegLens right ascension (ICRS) at epoch epLdegpos.eq.raDELdegLens Declination (ICRS) at epoch epLdegpos.eq.decEpLLens epoch (Julian year)yrtime.epochdoublepmRA*LLens proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRA*LError on lens proper motion along RAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDELLens proper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDELError on lens proper motion along DEmas/yrstat.error;pos.pm;pos.eq.decfloatPlxLLens parallaxmaspos.parallax.trigfloate_PlxLError on lens Parallaxmasstat.errorfloatgmagL? Lens g_P1 magnitudemagphot.mag;em.opt.Bfloatnullablee_gmagL? Error on lens g_P1 magnitudemagstat.error;phot.magfloatnullablermagL? Lens r_P1 magnitudemagphot.mag;em.opt.Rfloatnullablee_rmagL? Error on lens r_P1 magnitudemagstat.error;phot.magfloatnullableimagL? Lens i_P1 magnitudemagphot.mag;em.opt.Ifloatnullablee_imagL? Error on lens i_P1 magnitudemagstat.error;phot.magfloatnullablezmagL? Lens z_P1 magnitudemagphot.mag;em.opt.Ifloatnullablee_zmagL? Error on lens z_P1 magnitudemagstat.error;phot.magfloatnullableymagL? Lens y_P1 magnitudemagphot.mag;em.IR.Jfloatnullablee_ymagL? Error on lens y_P1 magnitudemagstat.error;pos.cartesian.yfloatnullableJmagLLens 2MASS J magnitudemagphot.mag;em.IR.Jfloate_JmagLError on lens 2MASS J magnitudemagstat.error;phot.magfloatHmagL? Lens 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_HmagL? Error on lens 2MASS H magnitudemagstat.error;phot.magfloatnullableKsmagL? Lens 2MASS K_S magnitudemagphot.mag;em.IR.Kfloatnullablee_KsmagL? Error on lens 2MASS K_S magnitudemagstat.error;phot.magfloatnullableW1magL? Lens AllWISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1magL? Error on lens AllWISE W1 magnitudemagstat.error;phot.magfloatnullableW2magL? Lens AllWISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2magL? Error on lens AllWISE W2 magnitudemagstat.error;phot.magfloatnullableW3magL? Lens AllWISE W3 magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_W3magL? Error on lens AllWISE W3 magnitudemagstat.error;phot.magfloatnullableW4magL? Lens AllWISE W4 magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_W4magL? Error on lens AllWISE W4 magnitudemagstat.error;phot.magfloatnullableMassLLens masssolMassphys.massfloatGDR2Source GDR2 ID (source_id)meta.id.parentRA_ICRSSource right ascension (ICRS) at epoch 2015.5degpos.eq.ra;meta.maine_RA_ICRSError on Source RAmasstat.error;pos.eq.rafloatDE_ICRSSource declination (ICRS) at epoch 2015.5degpos.eq.dec;meta.maine_DE_ICRSError on Source DEmasstat.error;pos.eq.decfloatEp[2015.5] Source Epoch (Julian year)yrtime.epochfloatpmRA*? Source proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA*? Error on Source proper motion along RAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Source proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? Error on Source proper motion along DEmas/yrstat.error;pos.pm;pos.eq.decfloatnullablee_Plx? Error on source absolute Parallaxmasstat.error;pos.parallaxfloatnullableGmagSource G mean magnitudemagphot.mag;em.optfloate_GmagError on Source G mean magnitudemagstat.error;phot.magfloatBPmag? Source G_BP mean magnitudemagphot.mag;em.opt.Bfloatnullablee_BPmag? Error on Source G_BP mean magnitudemagstat.error;phot.magfloatnullableRPmag? Source G_RP mean magnitudemagphot.mag;em.opt.Rfloatnullablee_RPmag? Error on Source G_RP mean magnitudemagstat.error;phot.magfloatnullablethetaEMedian theta_Emasstat.fit.paramfloate_thetaEError on theta_Emasstat.errorfloatu0tMinimum normalised source-lens separation u_0 in theta_E units (theta_E)pos.distance;stat.minfloate_u0t15.9 percentile of the minimum normalised source-lens separation u_0 (theta_E)stat.error;stat.minfloatE_u0t84.1 percentile of the minimum normalised source-lens separation u_0 (theta_E)stat.error;stat.maxfloatu0Minimum source-lens separation u_0maspos.distancefloate_u015.9 percentile of the minimum source-lens separation u_0masstat.error;stat.minfloatE_u084.1 percentile of the minimum source-lens separation u_0masstat.error;stat.maxfloatt0Median t_0 (Julian year)yrtime.epochdoublee_t015.9 Percentile t_0 (Julian year)yrstat.errordoubleE_t084.1 Percentile t_0 (Julian year)yrstat.error;stat.maxdoubledAA1Median {DELTA}(A,A_1_)magphot.mag;arith.difffloate_dAA115.9 Percentile {DELTA}(A,A_1_))magstat.errorfloatE_dAA184.1 Percentile {DELTA}(A,A_1_))magstat.error;stat.maxfloatTdAA1Median T[{DELTA}(A,A_1_))]dem.wl.central;stat.medianfloate_TdAA115.9 Percentile T[{DELTA}(A,A_1_))]dstat.errorfloatE_TdAA184.1 Percentile T[{DELTA}(A,A_1_))]dstat.error;stat.maxfloatdmth2Median {DELTA}({delta}_mic_,{theta}_2_)masstat.fit.paramfloate_dmth215.9 Percentile {DELTA}({delta}_mic_,{theta}_2_)masstat.errorfloatE_dmth284.1 Percentile {DELTA}({delta}_mic_,{theta}_2_)masstat.error;stat.maxfloatTdmth2Median T[{DELTA}({delta}_mic_,{theta}_2_)]dtime;arith.difffloate_Tdmth215.9 Percentile T[{DELTA}({delta}_mic_,{theta}_2_)]dstat.errorfloatE_Tdmth284.1 Percentile T[{DELTA}({delta}_mic_,{theta}_2_)]dstat.error;stat.maxfloat_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decnullableindexedPlx? Source absolute parallaxmaspos.parallax.trigfloatnullableSimbadNameSimbad column added by the CDSmeta.idchar