J/AJ/154/134ivo://CDS.VizieR/J/AJ/154/134doi:10.26093/cds/vizier.51540134CDSEsplin T.L.Luhman K.L.2019-11-11T22:00:00Z2018-07-09T11:46:19ZCDS support team

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

cds-question@unistra.frstar-forming-regionsbrown-dwarfsproper-motionsstellar-spectral-typesextinctioninfrared-photometryWe present the initial results from a survey for planetary-mass brown dwarfs in the Taurus star-forming region. We have identified brown dwarf candidates in Taurus using proper motions and photometry from several ground- and space- based facilities. Through spectroscopy of some of the more promising candidates, we have found 18 new members of Taurus. They have spectral types ranging from mid-M to early-L, and they include the four faintest known members in extinction-corrected K_s_, which should have masses as low as ~4-5 M_Jup_ according to evolutionary models. Two of the coolest new members (M9.25, M9.5) have mid-IR excesses that indicate the presence of disks. Two fainter objects with types of M9-L2 and M9-L3 also have red mid-IR colors relative to photospheres at =<L0, but since the photospheric colors are poorly defined at >L0, it is unclear whether they have excesses from disks. We also have obtained spectra of candidate members of the IC 348 and NGC 1333 clusters in Perseus that were identified by Luhman et al. Eight candidates are found to be probable members, three of which are among the faintest and least-massive known members of the clusters (~5 M_Jup_).2017AJ....154..134Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/134CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/314 : UKIDSS-DR8 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/328 : AllWISE Data Release (Cutri+ 2013)I/337 : Gaia DR1 (Gaia Collaboration, 2016)J/ApJ/525/466 : Young low-mass stars and brown dwarfs in IC 348J/ApJ/578/914 : Low-mass stars in Taurus (Hartmann, 2002)J/ApJ/597/555 : IR photometry of IC 348 young brown dwarfs (Mainzer+, 2003)J/AJ/127/1131 : NGC 1333 low-mass stars infrared photometry (Wilking+, 2004)J/A+A/446/485 : New very low-mass members in Taurus (Guieu+, 2006)J/ApJ/645/676 : Spatial distribution of brown dwarfs in Taurus (Luhman+, 2006)J/ApJ/647/1180 : Infrared photometry of Taurus SFR (Luhman+, 2006)J/AJ/136/1372 : Very low-mass YSOs in NGC 1333 (Oasa+, 2008)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)J/ApJ/784/126 : Infrared photometry of all known members in TaurusJ/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/134https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/134http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/134https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/134https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/134http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/134GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/154/134/table1 (Proper Motions of Taurus Members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/134/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/134/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/134/table1?GETtext/xml+votable180.050000true60.9554526.18111940.005555555555555556Cone search capability for table J/AJ/154/134/table3 (Spectral Types for Candidate Members of Taurus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/134/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/134/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/134/table3?GETtext/xml+votable180.050000true62.753391727.28787220.005555555555555556Cone search capability for table J/AJ/154/134/table5 (Spectral Types for Candidate Members of IC 348 and NGC 1333)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/134/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/134/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/134/table5?GETtext/xml+votable180.050000true56.118541732.18580560.0055555555555555565/262 268 269 270 278 289 292 5887 6/337 342 350 368 369 374 377 862 1029 1030 1031 1033 1036 1037 1039 1040 1042 1043 1047 1052 1053 1054 1061 1062 1063 1066 1068 1069 1084 1086 1094 1102 1104 1106 1111 1123 1124 1126 1128 1136 1152 1154 1176 1177 1539 23517 23518 23533 23538 23542 23543 23547 24107 24192 24194 24195 24201 24202 24203 24221 24224 24232 24270 24289 24294 24295 243006.772611666688002e-21 1.0188844282367877e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/154/134?format=asciiInfrareddefaultJ/AJ/154/134/table1Proper Motions of Taurus MembersSimbadNameSimbad column added by the CDSmeta.idcharOName? Other namemeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (G1)meta.id;meta.maincharpmRA-IRAC[-2.8/16.3]? IRAC relative proper motion in RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-IRAC[0/9.5]? Error in pmRA-IRACmas/yrstat.error;pos.pmfloatnullablepmDE-IRAC[-25.3/-0.1]? IRAC relative proper motion in DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-IRAC[0.1/8.4]? Error in pmDE-IRACmas/yrstat.error;pos.pmfloatnullablepmRA-UKIDSS[-10.7/11.8]? UKIDSS relative proper motion in RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-UKIDSS[2.8/7.5]? Error in pmRA-UKIDSSmas/yrstat.error;pos.pmfloatnullablepmDE-UKIDSS[-28.8/-10]? UKIDSS relative proper motion in DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-UKIDSS[2.8/7.5]? Error in pmDE-UKIDSSmas/yrstat.error;pos.pmfloatnullablepmRA-2MGaia[-7.4/28.5]? 2MASS/Gaia proper motion in RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-2MGaia[3.5/8.1]? Error in pmRA-2MGaiamas/yrstat.error;pos.pmfloatnullablepmDE-2MGaia[-42/-2.6]? 2MASS/Gaia proper motion in DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-2MGaia[3.5/9.4]? Error in pmDE-2MGaiamas/yrstat.error;pos.pmfloatnullablepmRA-2MPS1[-14/29.6]? 2MASS/PS1 proper motion in RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-2MPS1[3.8/8.6]? Error in pmRA-2MPS1mas/yrstat.error;pos.pmfloatnullablepmDE-2MPS1[-40.3/-2.9]? 2MASS/PS1 proper motion in DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-2MPS1[3.9/10.0]? Error in pmDE-2MPS1mas/yrstat.error;pos.pmfloatnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/154/134/table2IRAC Observations of TaurusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintAOR[3653120/47147008] Astronomical Observing Request identifiermeta.id;meta.mainintPID[6/90071] Program identifiermeta.id;obsintPIPrinciple Investigator nameobs.observercharEpoch[2004.2/2013.9] Year of observationyrtime.epochfloatJ/AJ/154/134/table3Spectral Types for Candidate Members of TaurusrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (G1)meta.id;meta.maincharMemb[1/2] Membership flag (1=Member, 2=Non-member)meta.code.errorintSpTypeSpectral type, or range and comment (G2)src.spTypecharb_AJmag[0/8.7]? J passband extinction, lower valuemagphys.absorption;em.IR.J;stat.minfloatnullableB_AJmag[1.2/1.5]? J passband extinction, upper valuemagphys.absorption;em.IR.J;stat.maxfloatnullableInstInstrument used (SpeX, GNIRS)instr.setupcharDateDate of spectroscopytime.epochnullableKsmag[10.39/15.88] K_s_ band magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.01/0.06] Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloatr_KsmagCatalog reference for Ksmag (UKIDSS, 2MASS)meta.ref;pos.framechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/AJ/154/134/table4Mid-IR Photometry for Members of Taurus Adopted Since Esplin et al. (2014, J/ApJ/784/126)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (G1)meta.id;meta.maincharW1mag[6.73/15.06]? WISE W1 band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.02/0.04]? Uncertainty in W1magmagstat.error;phot.magfloatnullablen_W1mag[n] Note on W1mag (1)meta.notecharW2mag[7.3/14.63]? WISE W2 band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.02/0.08]? Uncertainty in W2magmagstat.error;phot.magfloatnullablen_W2mag[n] Note on W2mag (1)meta.notecharl_W3mag[>] Limit flag on W3magmeta.code.errorcharW3mag[7.22/12.53]? WISE W3 band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_W3mag[0.02/0.52]? Uncertainty in W3magmagstat.error;phot.magfloatnullablen_W3mag[an] Note on W3mag (1)meta.notecharl_W4mag[>] Limit flag on W4magmeta.code.errorcharW4mag[5.77/8.94]? WISE W4 band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_W4mag[0.05/0.52]? Uncertainty in W4magmagstat.error;phot.magfloatnullablen_W4mag[an] Note on W4mag (1)meta.notechar3.6mag[7.45/14.85]? Spitzer/IRAC 3.6{mu}m band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0.02/0.03]? Uncertainty in 3.6magmagstat.errorfloatnullablen_3.6mag[o] Note on 3.6mag (1)meta.notechar4.5mag[7.39/14.57]? Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0.02/0.09]? Uncertainty in 4.5magmagstat.errorfloatnullablen_4.5mag[o] Note on 4.5mag (1)meta.notechar5.8mag[7.38/14.4]? Spitzer/IRAC 5.8{mu}m band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0.03/0.1]? Uncertainty in 5.8magmagstat.errorfloatnullablen_5.8mag[o] Note on 5.8mag (1)meta.notechar8.0mag[7.35/14.08]? Spitzer/IRAC 8.0{mu}m band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0.03/0.13]? Uncertainty in 8.0magmagstat.errorfloatnullablen_8.0mag[no] Note on 8.0mag (1)meta.notechar24mag[7.24/9.16]? Spitzer/MIPS 24{mu}m band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0.04/0.31]? Uncertainty in 24magmagstat.errorfloatnullablen_24mag[no] Note on 24mag (1)meta.notecharExcess[Y N Y?] Mid-IR excess emission?meta.codechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/AJ/154/134/table5Spectral Types for Candidate Members of IC 348 and NGC 1333SimbadNameSimbad column added by the CDSmeta.idcharB_AJmag[1.3/1.7]? J passband extinction, upper valuemagphys.absorption;em.IR.J;stat.maxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (G1)meta.id;meta.maincharCluster[1/2] Cluster name (1=IC 348, 2=NGC 1333)meta.id.parentintONameOther name(s)meta.idcharSpTypeSpectral type, or range and comment (G2)src.spTypecharb_AJmag[0/5.4]? J passband extinction, lower valuemagphys.absorption;em.IR.J;stat.minfloatnullableMemb[Y N? Y?] Member statusmeta.code.membercharInstInstrument used (SpeX, GNIRS)instr.setupcharDateDate of spectroscopytime.epochnullable_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.mainnullable_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainnullable