J/MNRAS/433/457ivo://CDS.VizieR/J/MNRAS/433/457doi:10.26093/cds/vizier.74330457CDSBurningham B.Cardoso C.V.Smith L.Leggett S.K.Smart R.L.Mann A.W.,Dhital S.Lucas P.W.Tinney C.G.Pinfield D.J.Zhang Z.Morley C.,Saumon D.Aller K.Littlefair S.P.Homeier D.Lodieu N.Deacon N.,Marley M.S.van Spaandonk L.Baker D.Allard F.Andrei A.H.Canty J.,Clarke J.Day-Jones A.C.Dupuy T.Fortney J.J.Gomes J.Ishii M.,Jones H.R.A.Liu M.Magazzu A.Marocco F.Murray D.N.Rojas-Ayala B.,Tamura M.2024-07-22T20:13:26Z2014-09-03T13:34:16ZCDS support team

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

cds-question@unistra.frsurveysdwarf-starslate-type-starsphotometryspectroscopyWe report the discovery of 76 new T dwarfs from the UKIRT Infrared Deep Sky Survey (UKIDSS) Large Area Survey (LAS). Near-infrared broad- and narrow-band photometry and spectroscopy are presented for the new objects, along with Wide-field Infrared Survey Explorer (WISE) and warm-Spitzer photometry. Proper motions for 128 UKIDSS T dwarfs are presented from a new two epoch LAS proper motion catalogue. We use these motions to identify two new benchmark systems: LHS 6176AB, a T8p+M4 pair and HD 118865AB, a T5.5+F8 pair. Using age constraints from the primaries and evolutionary models to constrain the radii, we have estimated their physical properties from their bolometric luminosity. We compare the colours and properties of known benchmark T dwarfs to the latest model atmospheres and draw two principal conclusions. First, it appears that the H-[4.5] and J-W2 colours are more sensitive to metallicity than has previously been recognized, such that differences in metallicity may dominate over differences in Teff when considering relative properties of cool objects using these colours. Secondly, the previously noted apparent dominance of young objects in the late-T dwarf sample is no longer apparent when using the new model grids and the expanded sample of late-T dwarfs and benchmarks. This is supported by the apparently similar distribution of late-T dwarfs and earlier type T dwarfs on reduced proper motion diagrams that we present. Finally, we present updated space densities for the late-T dwarfs, and compare our values to simulation predictions and those from WISE.2013MNRAS.433..457Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/433/457CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/127/3553 : JHK photometry & spectroscopy for L & T dwarfs (Knapp+, 2004)J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)J/ApJ/637/1067 : Near-IR spectral classification of T dwarfs (Burgasser+, 2006)J/AJ/134/1162 : 11 new T dwarfs in 2MASS (Looper+, 2007)J/ApJS/205/6 : T dwarf population revealed by WISE (Mace+, 2013)J/ApJS/197/19 : First brown dwarfs discovered by WISE (Kirkpatrick+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/433/457https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/433/457http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/433/457https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/433/457https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/433/457http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/433/457GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/433/457/Tstars (Our sample of T dwarfs: near-IR photometry (table1), and spectral types (table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/433/457/Tstars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/433/457/Tstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/433/457/Tstars?GETtext/xml+votable180.050000true1.89541671.21308330.005555555555555556Cone search capability for table J/MNRAS/433/457/table5 (Proper motions for T dwarfs within UKIDSS LAS sky)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/433/457/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/433/457/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/433/457/table5?GETtext/xml+votable180.050000true22.5741258.08163890.0055555555555555566/56 133 4131 4166 4181 4212 4237 4250 4760-4761 4790-4791 4804 4808 4827 4839 4848 4851 4956 4989 6161 6163-6164 6166-6167 6217 8215 8219 8244 8250 8253 8255 8281-8282 8299 8350-8351 8418 8692 8717 8719 9251 9257 9266 9352 9366 9413 10406 17887 18094 18182 18227 18236 18264 18396 18418 18799 18895 18900 18906 18908 19108 19252 19269 19458 19608 19659 21839 21846 21853 21856 21865 21880 22007 23272 23274 25591 25595 25598 25966 26018 26020 26030 26052 26073 26215 26252 26321 26365 26456 26469 26514 26525 26543 26555 26564 26569-26570 26587 26960 27020 27048 27056 27059 27074 27111 27215 27230 27235 27258 27286-27287 27299 27332 27359 27368 27382 27388 27391 27430 27437 27501 27514 27536 27541 27547 27684-27685 27735 27737 27754-27756 27797-27798 27827 27848 27858 27920 27925 27936 31405 31421 31425 31434 31469 31486 409478.157980699529898e-21 2.3647030891844645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/433/457?format=asciiOpticaldefaultJ/MNRAS/433/457/TstarsOur sample of T dwarfs: near-IR photometry (table1), and spectral types (table 2)CH4-JCH4-J indexspect.indexfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (full star name)meta.id;meta.maincharprimaryn_Name[abc] Non-UKIDSS designation (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainphA positive number indicates that photometry exists from Spitzer (table4) or WISE (table3)meta.ref.urlintnullablepmSimbad column added by the CDSmeta.noteintnullablel_z'magLimit flag on z'magmeta.code.errorcharz'mag? SDSS z' magnitude (4)magphot.mag;em.opt.Ifloatnullablee_z'mag? rms uncertainty on z'magmagstat.error;phot.mag;em.opt.Ifloatnullabler_z'mag[ADE] Origin of z'mag (3)meta.ref;pos.framecharYmagMKO Y magnitudemagphot.mag;em.IR.Jfloate_Ymagrms uncertainty on Ymagmagstat.error;phot.mag;em.opt.Bfloatr_Ymag[UW] Origin of Ymag (3)meta.ref;pos.framecharJmagMKO J magnitudemagphot.mag;em.IR.Jfloate_Jmagrms uncertainty on Jmagmagstat.error;phot.mag;em.IR.Jfloatr_Jmag[UW] Origin of Jmag (3)meta.ref;pos.framecharHmag? MKO H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.Hfloatnullabler_Hmag[UW] Origin of Hmag (3)meta.ref;pos.framecharKmag? MKO K magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.Kfloatnullabler_Kmag[W] Origin of Kmag (3)meta.ref;pos.framecharl_CH4iLimit flag on CH4imeta.code.errorcharCH4i? Methane filter colour index CH4s-CH4l (5)magphot.color;em.IR;em.IRfloatnullablee_CH4i? rms uncertainty on CH4imagstat.errorfloatnullabler_CH4i[L] Origin of CH4imeta.ref;pos.framecharSp4Spectral type from CH4src.spTypecharb_Sp4Lower value of CH4 type (min)meta.notecharB_Sp4Upper value of CH4 type (max)meta.notecharSpTAdopted spectral type (G1)src.spTypecharSNameShort name (as in tables 2 and 3)meta.idcharTemplTemplate spectral typemeta.id;stat.fitcharH2O-JH_2_O-J indexspect.indexfloatnullablee_H2O-Jrms uncertainty on H2O-Jstat.errorfloatnullablen_H2O-JSpectral type from H2O-J (G1)meta.notechare_CH4-Jrms uncertainty on CH4-Jstat.errorfloatnullablen_CH4-JSpectral type from CH4-J (G1)meta.notecharWJW_J_ index [F(1.180-1.230)/F(1.260-12.285)]spect.indexfloatnullablee_WJrms uncertainty on WJstat.errorfloatnullablen_WJSpectral type from WJ (G1)meta.notecharH2O-H? H_2_O-H indexspect.indexfloatnullablee_H2O-H? rms uncertainty on H2O-Hstat.errorfloatnullablen_H2O-HSpectral type from H2O-H (G1)meta.notecharCH4-H? CH_4_-H indexspect.indexfloatnullablee_CH4-H? rms uncertainty on CH4-Hstat.errorfloatnullablen_CH4-HSpectral type from CH4-H (G1)meta.notecharCH4-K? CH_4_-K indexspect.indexfloatnullablee_CH4-K? rms uncertainty on CH4-Kstat.errorfloatnullablen_CH4-KSpectral type from CH4-K (G1)meta.notecharNoteReferences and other spectral type (6)meta.notecharJ/MNRAS/433/457/table3WISE photometry for 25 of the spectroscopically confirmed T dwarfs presented here for the first timeNameComplete star namemeta.id;meta.maincharblend[Y/N] WISE blend?phot.flux.density;em.IR.8-15umcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameShort namemeta.idcharl_W1magLimit flag on W1magmeta.code.errorcharW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umfloate_W1mag? rms uncertainty on W1magmagstat.error;phot.magfloatnullableW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umfloate_W2magrms uncertainty on W2magmagstat.error;phot.magfloatl_W3magLimit flag on W3magmeta.code.errorcharW3magWISE W3 magnitudemagphot.flux.density;em.IR.8-15umfloate_W3mag? rms uncertainty on W3magmagstat.error;phot.magfloatnullablel_W4magLimit flag on W4magmeta.code.errorcharW4magWISE W4 magnitudemagphot.flux.density;em.IR.15-30umfloate_W4mag? rms uncertainty on W4magmagstat.error;phot.magfloatnullableJ/MNRAS/433/457/table4*Spitzer photometry for a subset of T dwarfs,recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar full name (1)meta.id;meta.maincharSpTSpectral type (G1)src.spTypecharr_SpT[a-d] Reference for SpT (2)meta.ref;pos.framecharPIDProgramme numbermeta.id;obsintObsDateObservation date (UT)time.epoch;obsnullablePipePipeline versionmeta.versioncharFrameFrame timestime.epochintTintIntegration timemintime.epochfloatApAperturearcsecphys.angSize;instr.fovfloat[3.6]IRAC 3.6um magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]rms uncertainty on [3.6]magstat.errorfloat[4.5]IRAC 4.5um magnitudemagphot.mag;em.IR.4-8umfloate_[4.5]rms uncertainty on [4.5]magstat.errorfloatNotes[AB] Notes (3)meta.notecharJ/MNRAS/433/457/table5Proper motions for T dwarfs within UKIDSS LAS skydtEpoch baselineyrtime;arith.difffloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameNamemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainTSimbad column added by the CDSmeta.ref.urlintnullableSpTSpectral type on the system of Burningham et al. (2008MNRAS.391..320B) (G1)src.spTypecharr_pm? Proper motion reference (3)meta.ref;pos.frameintnullablepmRAProper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloate_pmRArms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatn_dt[W] The baseline includes our follow-up (1)meta.notecharDminMinimum plausible distance (2)pcpos.distance;pos.heliocentricfloatDmaxMaximum plausible distance (2)pcpos.distance;pos.heliocentricfloatDmax2Maximum plausible distance for binary (2)pcpos.distance;pos.heliocentricfloat