J/A+A/685/A6ivo://CDS.VizieR/J/A+A/685/A6doi:10.26093/cds/vizier.36850006CDSRavinet T.Reyle C.Lagarde N.Burgasser A.Smart R.L.Moya W.H.,Marocco F.Scholz R.-D.Cooper W.J.Cruz K.L.Fernandez-Trincado J.G.,Homeier D.Sarro L.M.2025-01-17T20:01:02Z2024-04-30T12:11:46ZCDS support team

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

cds-question@unistra.frbrown-dwarfslate-type-starsmorgan-keenan-classificationinfrared-astronomyspectroscopyThe local census of very low-mass stars and brown dwarfs is crucial to improving our understanding of the stellar-substellar transition and their formation history. These objects, known as ultra-cool dwarfs (UCDs), are essential targets for searches of potentially habitable planets. However, their detection poses a challenge because of their low luminosity. The Gaia survey has identified numerous new UCD candidates thanks to its large survey and precise astrometry. We aim to characterise 60 UCD candidates detected by Gaia in the solar neighbourhood with a spectroscopic follow-up to confirm that they are UCDs, as well as to identify peculiarities. We acquired the near-infrared (NIR) spectra of 60 objects using the SOFI spectrograph between 0.93 and 2.5 microns (R~600). We identified their spectral types using a template-matching method. Their binarity is studied using astrometry and spectral features. We confirm that 60 objects in the sample have ultra-cool dwarf spectral types close to those expected from astrometry. Their NIR spectra reveal that seven objects could host an unresolved coolest companion and seven UCDs share the same proper motions as other stars. The characterisation of these UCDs is part of a coordinated effort to improve our understanding of the Solar neighbourhood.2024A&A...685A...6Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/685/A6CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/685/A6https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/685/A6http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/685/A6https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/685/A6https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/685/A6http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/685/A6GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/685/A6/tabled (List of studied stars (tables D1+D2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/685/A6/tabled?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/685/A6/tabled?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/685/A6/tabled?GETtext/xml+votable180.050000true110.476667-31.0778890.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/685/A66/298 16608 16645 17263 17985 18266 19481 20993 22409 22708 22870 22904 22910 22972 23247 23614 24733 26761 28943 29330 29691 29887 31004 33800 33877 34776 34833 36058 36636 37283 37806 37808-37810 37988 38237 38400 38592 38608 38637 39339 39433 39825 39961 40054 40225 40255 40494 40712 41861 41929 42891 43567 44432 44457 45818 46148 47133 478508.650015785639275e-20 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/685/A6?format=asciiOpticalInfrareddefaultJ/A+A/685/A6/tabledList of studied stars (tables D1+D2)SNameShortname of the object (JHHMM+DDMM), as in table D1meta.idcharn_SName[a] Note on Name (1)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainplxParallaxmaspos.parallax.trigfloate_plxParallax errormasstat.error;pos.parallaxfloatpmRAProper motion along RAmas/yrpos.pm;pos.eq.radoublee_pmRAProper motion along RA errormas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decdoublee_pmDEProper motion along DE errormas/yrstat.error;pos.pm;pos.eq.decfloatVtanTangential velocitykm/sphys.veloc.transversefloate_VtanTangential velocity errorkm/sstat.errorfloatSName2Shortname of the object (JHHMM+DDMM), as in table D2meta.notecharGaiaDR3Gaia DR3 source IDmeta.id;meta.mainGmagGaia G apparent magnitudemagphot.mag;em.optfloate_GmagGaia G apparent magnitude rms uncertaintymagstat.error;phot.magfloatRPmagGaia G_RP apparent magnitudemagphot.mag;em.opt.Rfloate_RPmagGaia G_RP apparent magnitude rms uncertaintymagstat.error;phot.magfloatJmag2MASS J apparent magnitudemagphot.mag;em.IR.Jfloate_Jmag2MASS J apparent magnitude rms uncertaintymagstat.error;phot.magfloatHmag2MASS H apparent magnitudemagphot.mag;em.IR.Hfloate_Hmag2MASS H apparent magnitude rms uncertaintymagstat.error;phot.magfloatFileNameName of the fits spectrum file in subdirectory fitsmeta.id;meta.fitscharAssocDataAssociated Data web pagemeta.ref.urlcharKsmag2MASS Ks apparent magnitudemagphot.mag;em.IR.Kfloate_Ksmag2MASS Ks apparent magnitude rms uncertaintymagstat.error;phot.magfloatSpTypeSpectral typesrc.spTypecharTeff? Effective temperature, derived using BT-Settl (CIFIST) modelsKphys.temperatureintnullablee_Teff? Effective temperature uncertaintyKstat.error;phys.temperature.effectiveintnullablespShow the spectrummeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSimbadSimbad column added by the CDSmeta.ref.urlchar