J/ApJ/862/173ivo://CDS.VizieR/J/ApJ/862/173doi:10.26093/cds/vizier.18620173CDSTheissen C.A.2018-09-17T07:05:53Z2018-09-14T11:27:31ZCDS support team

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

cds-question@unistra.frlate-type-starsvisible-astronomytrigonometric-parallaxproper-motionsThis paper uses the multi-epoch astrometry from the Wide-field Infrared Survey Explorer (WISE) to demonstrate a method to measure proper motions and trigonometric parallaxes with precisions of ~4mas/yr and ~7mas, respectively, for low-mass stars and brown dwarfs. This method relies on WISE single exposures (Level 1b frames) and a Markov Chain Monte Carlo method. The limitations of Gaia in observing very low-mass stars and brown dwarfs are discussed, and it is shown that WISE will be able to measure astrometry past the 95% completeness limit and magnitude limit of Gaia (L, T, and Y dwarfs fainter than G~=19 and G=21, respectively). This method is applied to WISE data of 20 nearby (<=17pc) dwarfs with spectral types between M6-Y2 and previously measured trigonometric parallaxes. Also provided are WISE astrometric measurements for 23 additional low-mass dwarfs with spectral types between M6-T7 and estimated photometric distances <17pc. Only nine of these objects contain parallaxes within Gaia Data Release 2.2018ApJ...862..173Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/862/173CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)II/328 : AllWISE Data Release (Cutri+ 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/862/173https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/862/173http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/862/173https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/862/173https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/862/173http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/862/173GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/862/173/table (Proper motion and parallaxes for low-mass stars with estimated photometric distances <=17pc (tables 1 and 2 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/862/173/table?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/862/173/table?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/862/173/table?GETtext/xml+votable180.050000true162.3288125-53.31946670.0055555555555555566/10 221 3005 3040 5200 5817 6261 7220 7369 8402 8719 10977 11292 11834 12045 12427 13425 14127 15320 15651 16546 17530 18726 21729 23530 27730 27937 29657 32580 33257 33767 34660 34780 36841 37502 38039 38322 39683 40228 40882 40905 42528 46334https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/862/173?format=asciiOpticaldefaultJ/ApJ/862/173/tableProper motion and parallaxes for low-mass stars with estimated photometric distances <=17pc (tables 1 and 2 of the paper)SimbadNameSimbad column added by the CDSmeta.idchare_PlxError in Plxmasstat.error;pos.parallaxfloatNameIdentifiermeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintpmRAProper motion in RA*cos(DE) (pmRA*cos(DE)) from our best fit modelmas/yrpos.pm;pos.eq.rainte_pmRAError in pmRAmas/yrstat.error;pos.pm;pos.eq.raintpmDEProper motion in Declination (pmDE) from our best fit modelmas/yrpos.pm;pos.eq.decinte_pmDEError in pmDEmas/yrstat.error;pos.pm;pos.eq.decintPlxAbsolute trigonometric parallaxmaspos.parallax.trigfloat_RAname=table.pos Eq=J2000 (right ascension part)degpos.eq.ra;meta.main_DEname=table.pos Eq=J2000 (declination part)degpos.eq.dec;meta.main