J/MNRAS/480/5447ivo://CDS.VizieR/J/MNRAS/480/5447doi:10.26093/cds/vizier.74805447CDSZhang Z.H.Galvez-Ortiz M.C.Pinfield D.J.Burgasser A.J.Lodieu N.,Jones H.R.A.Martin E.L.Burningham B.Homeier D.Allard F.,Zapatero Osorio M.R.Smith L.C.Smart R.L.Lopez Marti B.Marocco F.,Rebolo R.2024-08-18T20:21:33Z2022-06-29T14:09:21ZCDS support team

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

cds-question@unistra.frspectroscopic-binary-starsbrown-dwarfspeculiar-variable-starspopulation-ii-starssubdwarf-starsWe present 27 new L subdwarfs and classify five of them as esdL and 22 as sdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried out primarily with the OSIRIS spectrograph on the Gran Telescopio Canarias. Some of these new objects were followed up with the X-shooter instrument on the Very Large Telescope. We studied the photometric properties of the population of known L subdwarfs using colour-spectral type diagrams and colour-colour diagrams, by comparison with L dwarfs and main sequence stars, and identified new colour spaces for L subdwarf selection/study in current and future surveys. We further discussed the brown dwarf transition-zone and the observational stellar/substellar boundary. We found that about one-third of 66 known L subdwarfs are substellar objects, with two-thirds being very low-mass stars. We also present the Hertzsprung-Russell diagrams, spectral type-absolute magnitude corrections, and tangential velocities of 20 known L subdwarfs observed by the Gaia astrometry satellite. One of our L subdwarf candidates, ULAS J233227.03+123452.0, is a mildly metal-poor spectroscopic binary brown dwarf: a ~L6p dwarf and a ~T4p dwarf. This binary is likely a thick disc member according to its kinematics.2018MNRAS.480.5447Zhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/480/5447CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/480/5447https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/480/5447http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/480/5447https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/480/5447https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/480/5447http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/480/5447GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/480/5447/table1 (Optical and NIR photometry of L subdwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/5447/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/5447/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/5447/table1?GETtext/xml+votable180.050000true16.201958315.58386110.005555555555555556Cone search capability for table J/MNRAS/480/5447/table5 (Properties of a spectral binary UL2332+12)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/5447/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/5447/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/5447/table5?GETtext/xml+votable180.050000true353.11262512.58111110.005555555555555556Cone search capability for table J/MNRAS/480/5447/table6 (Photometric properties of new M-L dwarfs/subdwarfs identified in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/480/5447/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/480/5447/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/480/5447/table6?GETtext/xml+votable180.050000true16.201958315.58386110.0055555555555555566/128 1028 2597 3965 4784 8230 8234 8292 8713 8719 9467 10294 10337 10354 10363 16138 16147 16757 17261 17469 17856 17864 17907 18211 18858 18888 18907 19249 19286 19317 19643 19778 19820 20000 21977 23196 25845 25916 26033 26055 26186 26261 26271 26396 26446 26471 26537 26539 26667 27132 27685 27904 27968 28156 31293 31397 31696 32574 32602 35666 36830 37160 37519 38915 41005 41659 446323.830199579824256e-20 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/480/5447?format=asciidefaultJ/MNRAS/480/5447/table1Optical and NIR photometry of L subdwarfsSimbadNameSimbad column added by the CDSmeta.idcharnullableRefReferences (3)meta.refcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSubdwarf namemeta.id;meta.maincharn_NameNote on the object's photometry (1)meta.notecharSpTypeSpectral typesrc.spTypecharn_SpType[*] Note on SpType (2)meta.notecharimag? SDSS i magnitude (SDSSi)magphot.mag;em.opt.Ifloatnullablee_imag? Error on imagmagstat.error;phot.magfloatnullablezmag? SDSS z magnitude (SDSSz)magphot.mag;em.opt.Ifloatnullablee_zmag? Error on zmagmagstat.error;phot.magfloatnullableYmag? MKO Y-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Ymag? Error on Ymagmagstat.error;phot.magfloatnullableJmagMKO J-band magnitudemagphot.mag;em.IR.Jfloate_JmagError on Jmagmagstat.error;phot.magfloatHmagMKO H-band magnitudemagphot.mag;em.IR.Hfloate_HmagError on Hmagmagstat.error;phot.magfloatl_Kmag? Lower limit on Kmagmeta.code.errorcharKmagMKO K-band magnitudemagphot.mag;em.IR.Kfloate_Kmag? Error on Kmagmagstat.error;phot.magfloatnullable_RAPositions from Simbad and names (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad and names (declination part)degpos.eq.dec;meta.mainJ/MNRAS/480/5447/table2Summary of the characteristics of the spectroscopic observations made with the OSIRIS on the GTCrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameULAS star name (ULAS JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharIDProposal IDmeta.id;obscharDateUT observation datetime.epoch;obsnullableSeeingPhotometric seeingarcsecinstr.obsty.seeingfloatAirmassAirmassobs.airMassfloatGrismGrism (R500R and R300R grisms cover a wavelength range of 480-1020nm)meta.notecharTintIntegration time (in seconds) (1)time.epochcharSpType? Spectral typesrc.spTypecharStd? Standard star used for spectral flux calibrationmeta.idcharStdSpType? Spectral type of the standard starsrc.spTypecharr_Std? Reference of the standard star (2)meta.ref;pos.frameintnullableJ/MNRAS/480/5447/table3Summary of the characteristics of the spectroscopic observations made with X-shooterrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.id;meta.maincharSpTypeSpectral typesrc.spTypecharDateUT observation datetime.epoch;obsnullableSeeingPhotometric seeingarcsecinstr.obsty.seeingfloatAirmassAirmassobs.airMassfloatTintVISIntegration time for VIS arm (2)time.expocharTintNIRIntegration time for NIR arm (2)time.expocharTellstdTelluric standard stars (3)meta.idcharTellSpTypeSpectral type on the telluric standard starsrc.spTypecharAirmTellAirmass for the observation of the telluric standard starobs.airMassfloatJ/MNRAS/480/5447/table4Proper motions, distances, and tangential velocities of our 27 new L subdwarfse_pmRAError on pmRAmas/yrstat.error;pos.pm;pos.eq.raintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameStar ULAS short name (ULHHMM+DD)meta.idcharpmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.raintpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decinte_pmDEError on pmDEmas/yrstat.error;pos.pm;pos.eq.decintDistDistance (1)pcpos.distanceintE_DistUpper error on Distpcstat.error;stat.maxinte_DistLower error on Distpcstat.errorintVtanTangential velocitykm/sphys.veloc.transverseintE_VtanUpper error on Vtankm/sstat.error;stat.maxinte_VtanLower error on Vtankm/sstat.errorintNameULAS NAME (ULAS JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharJ/MNRAS/480/5447/table5Properties of a spectral binary UL2332+12DistDistance (1)pcpos.distanceinte_pmRAError on pmRA (2)mas/yrstat.error;pos.pm;pos.eq.raintpmDEProper motion in declination (2)mas/yrpos.pm;pos.eq.decinte_pmDEError on pmDE (2)mas/yrstat.error;pos.pm;pos.eq.decintVtanTangential velocitykm/sphys.veloc.transverseintE_VtanUpper error on Vtankm/sstat.error;stat.maxinte_VtanLower error on Vtankm/sstat.errorintRVRadial velocity (3)km/sphys.veloc;pos.heliocentricinte_RVError on RVkm/sstat.errorintUU component of space velocitykm/sphys.veloc;pos.cartesian.xinte_UError on Ukm/sstat.error;pos.cartesian.xintVV component of space velocitykm/sphys.veloc;pos.cartesian.yinte_VError on Vkm/sstat.error;pos.cartesian.yintWW component of space velocitykm/sphys.veloc;pos.cartesian.zinte_WError on Wkm/sstat.error;pos.cartesian.zintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameULAS name (ULAS JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainDateEpochtime.epochnullableimagSDDS i magnitudemagphot.mag;em.opt.Ifloate_imagError on imagmagstat.error;phot.magfloatzmagSDDS z magnitudemagphot.mag;em.opt.Ifloate_zmagError on zmagmagstat.error;phot.magfloatiP1magPan-STARRS i magnitudemagphot.mag;em.opt.Ifloate_iP1magError on iP1magmagstat.error;phot.magfloatzP1magPan-STARRS z magnitudemagphot.mag;em.opt.Ifloate_zP1magError on zP1magmagstat.error;phot.magfloatyP1magPan-STARRS y magnitudemagphot.mag;em.IR.Jfloate_yP1magError on yP1magmagstat.error;phot.magfloatYmagUKIDSS Y magnitudemagphot.mag;em.IR.Jfloate_YmagError on Ymagmagstat.error;phot.magfloatJmagUKIDSS J magnitudemagphot.mag;em.IR.Jfloate_JmagError on Jmagmagstat.error;phot.magfloatHmagUKIDSS H magnitudemagphot.mag;em.IR.Hfloate_HmagError on Hmagmagstat.error;phot.magfloatKmagUKIDSS K magnitudemagphot.mag;em.IR.Kfloate_KmagError on Kmagmagstat.error;phot.magfloatW1magWISE W1 (3.4um) band magnitudemagphot.mag;em.IR.3-4umfloate_W1magError on W1magmagstat.error;phot.magfloatW2magWISE W2 (4.6um) band magnitudemagphot.mag;em.IR.4-8umfloate_W2magError on W2magmagstat.error;phot.magfloatSpTypeSpectral type (from synthesized fit)src.spTypecharE_DistUpper error on Distpcstat.error;stat.maxinte_DistLower error on Distpcstat.errorintpmRAProper motion in right ascension (2)mas/yrpos.pm;pos.eq.raintJ/MNRAS/480/5447/table6Photometric properties of new M-L dwarfs/subdwarfs identified in this workSpTypeSpectral typesrc.spTypecharimagSDSS i magnitudemagphot.mag;em.opt.Ifloate_imagError on imagmagstat.error;phot.magfloatzmagSDSS z magnitudemagphot.mag;em.opt.Ifloate_zmagError on zmagmagstat.error;phot.magfloatYmagUKIDSS Y magnitudemagphot.mag;em.IR.Jfloate_YmagError on Ymagmagstat.error;phot.magfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameULAS star name (ULAS JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharJmagUKIDSS J magnitudemagphot.mag;em.IR.Jfloate_JmagError on Jmagmagstat.error;phot.magfloatHmagUKIDSS H magnitudemagphot.mag;em.IR.Hfloate_HmagError on Hmagmagstat.error;phot.magfloatKmagUKIDSS K magnitudemagphot.mag;em.IR.Kfloate_KmagError on Kmagmagstat.error;phot.magfloat_RAPositions from Simbad and names (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad and names (declination part)degpos.eq.dec;meta.mainJ/MNRAS/480/5447/table7PS1 and WISE photometry of L subdwarfsNameStar Namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintONamePS1 namemeta.idchariP1mag? Pan-STARRS i magnitudemagphot.mag;em.opt.Ifloatnullablee_iP1mag? Error on iP1magmagstat.error;phot.magfloatnullablezP1mag? Pan-STARRS z magnitudemagphot.mag;em.opt.Ifloatnullablee_zP1mag? Error on zP1magmagstat.error;phot.magfloatnullableyP1mag? Pan-STARRS y magnitudemagphot.mag;em.IR.Jfloatnullablee_yP1mag? Error on yP1magmagstat.error;phot.magfloatnullableW1mag? WISE W1 (3.4um) band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on W1magmagstat.error;phot.magfloatnullablel_W2mag? Lower limit on W2magmeta.code.errorcharW2mag? WISE W2 (4.6um) band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? Error on W2magmagstat.error;phot.magfloatnullableJ/MNRAS/480/5447/table9Gaia DR2 astrometry and photometry of 20 L subdwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharGaiaDR2Gaia DR2 source identifiermeta.idplxParallaxmaspos.parallax.trigfloate_plxError on plxmasstat.error;pos.parallaxfloatpmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.radoublee_pmRAError on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decdoublee_pmDEError on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatGmagGaia DR2 G-band magnitudemagphot.mag;em.optfloatBPmag? Gaia DR2 BP magnitudemagphot.mag;em.opt.BfloatnullableRPmag? Gaia DR2 RP magnitudemagphot.mag;em.opt.Rfloatnullable