J/AJ/136/1290ivo://CDS.VizieR/J/AJ/136/1290doi:10.26093/cds/vizier.51361290CDSReid N.I.Cruz K.L.Kirkpatrick J.D.Allen P.R.Mungall F.,Liebert J.Lowrance P.Sweet A.2017-10-18T08:24:13Z2009-09-14T08:01:01ZCDS support team

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

cds-question@unistra.frproper-motionsinfrared-photometryspectroscopyUsing data from the 2 Micron All Sky Survey All-Sky Point Source Catalogue, we have extended our census of nearby ultracool dwarfs to cover the full celestial sphere above Galactic latitude of 15{deg}. Starting with an initial catalog of 2139484 sources, we have winnowed the sample to 467 candidate late-type M or L dwarfs within 20pc of the Sun. Fifty-four of those sources already have spectroscopic observations confirming them as late-type dwarfs. We present optical spectroscopy of 376 of the remaining 413 sources, and identify 44 as ultracool dwarfs with spectroscopic distances less than 20pc. Twenty-five of the 37 sources that lack optical data have near-infrared spectroscopy. Combining the present sample with our previous results and data from the literature, we catalog 94 L dwarf systems within 2pc. We discuss the distribution of activity, as measured by H{alpha} emission, in this volume-limited sample. We have coupled the present ultracool catalog with data for stars in the northern 8pc sample and recent (incomplete) statistics for T dwarfs to provide a snapshot of the current 20pc census as a function of spectral type.2008AJ....136.1290Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/136/1290CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/AJ/123/2806 : Nearby stars in the NLTT catalogue (Reid+, 2002)J/AJ/123/2822 : Photometry of southern NLTT stars (Reid+, 2002)J/AJ/123/2828 : Spectroscopy of northern NLTT stars (Cruz+, 2002)J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)J/AJ/126/2449 : Nearby ultracool dwarfs in galactic plane (Reid+, 2003)J/AJ/126/3007 : Spectroscopy of faint red NLTT dwarfs (Reid+, 2003)J/AJ/128/463 : A preliminary 20pc census from NLTT catalogue (Reid+, 2004)J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007)J/AJ/133/2825 : Star beyond the NLTT catalog (Reid+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/136/1290https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/136/1290http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/136/1290https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/136/1290https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/136/1290http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/136/1290GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/136/1290/table2 (Previously known cool dwarfs recovered in the 2MUF sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table2?GETtext/xml+votable180.050000true1.1451667-40.73494440.005555555555555556Cone search capability for table J/AJ/136/1290/table3 (M6-L8 dwarfs discovered within 20pc)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table3?GETtext/xml+votable180.050000true10.3974167-56.35352780.005555555555555556Cone search capability for table J/AJ/136/1290/table4 (Ultracool dwarfs at distances exceeding 20pc)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table4?GETtext/xml+votable180.050000true1.4518333-21.95544440.005555555555555556Cone search capability for table J/AJ/136/1290/table5 (Spectroscopically confirmed giants)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table5?GETtext/xml+votable180.050000true6.38087586.62888890.005555555555555556Cone search capability for table J/AJ/136/1290/table6 (Spectroscopically confirmed Carbon stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table6?GETtext/xml+votable180.050000true25.2263333-72.14747220.005555555555555556Cone search capability for table J/AJ/136/1290/table7 (L dwarf spectral standards)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table7?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table7?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table7?GETtext/xml+votable180.050000true262.873916727.35647220.005555555555555556Cone search capability for table J/AJ/136/1290/table8 (L dwarfs with Lithium absorption)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table8?GETtext/xml+votable180.050000true4.2480417-40.94836110.005555555555555556Cone search capability for table J/AJ/136/1290/table9 (L dwarf systems within 20pc of the Sun)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/136/1290/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/136/1290/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/136/1290/table9?GETtext/xml+votable180.050000true1.1451667-40.73494440.0055555555555555566/22 96 116 221 322 410 496 548 586 599 780 2040 2044 2096 2202 2457 2502 2768 2789 3438 3525 3914 4079 4116 4226 4228 4253 4262 4263 4274 4291 4418 4608 4719 4775 4825 5621 5918 5919 5986 5993 6047 6198 6311 6328 6382 6408 6514 6613 6629 6783 6901 6983 7030 7033 7162 7163 7220 7262 7360 7364 7369 7382 7420 7440 7533 7709 7744 7985 7999 8037 8127 8348 8402 8715 8761 8794 8808 8972 9022 9072 9146 9271 9285 9385 9479 9715 10114 10243 10445 10819 10896 11264 11274 11292 11453 11596 11719 11766 12063 12247 12288 12369 12400 12444 12466 12582 12726 12770 12771 13481 13544 13598 13678 13716 13885 14850 14908 15043 15085 15180 15195 15906 15945 16021 16265 16293 16345 16346 16361 16375 16440 16546 16631 16793 16867 17075 17452 17530 17757 18032 18101 18166 18248 18266 18375 18428 18683 18782 19144 19174 19185 19188 19369 19525 19615 19763 19794 19857 20050 20141 20239 20323 20415 20436 20478 20754 21114 21209 21414 21435 21951 21985 21986 21988 22177 22759 22817 22861 22937 23010 23237 23290 23325 23436 23444 23462 23471 23533 23535 24566 24581 24590 24631 24632 24716 24803 25015 25044 25314 25433 25558 25775 25975 25992 26032 26046 26095 26209 26223 26279 26282 26300 26322 26324 26393 26403 26508 26518 26981 27019 27058 27201 27334 27372 27383 27402 27418 27435 27469 27648 27656 27789 28006 28262 28277 28316 28346 28372 28427 28432 29009 29301 29626 29763 29786 29987 30061 30081 30108 30160 30163 30195 30764 30778 30877 30925 30956 30977 30983 30987 30994 30995 30997 31003 31009 31010 31011 31025 31027 31062 31076 31109 31242 31262 31268 31296 31437 31509 31534 31594 31601 31653 31657 31779 31801 31802 31871 31905 31964 32142 32426 32568 32616 32643 32650 33003 33166 33228 33302 33351 33377 33398 33579 33585 33667 33689 33702 33767 34080 34094 34102 34154 34216 34400 34406 34407 34434 34445 34645 34660 34780 34818 34819 34839 34866 34886 34893 34961 35020 35022 35063 35106 35202 35203 35299 35327 35387 35412 35451 35471 35495 35499 35538 35568 35902 35906 35951 36142 36237 36436 36560 36602 36845 36919 36964 36998 37037 37103 37107 37113 37115 38176 38239 38322 38340 38349 38683 38785 38812 38865 38966 39086 39109 39140 39185 39440 39482 39485 39556 39807 40022 40191 40200 40273 40332 40669 40738 40863 40882 40969 41023 41095 41158 41268 41300 41306 41557 41984 42053 42635 42670 43251 43256 43320 43367 43393 43396 43406 43422 43450 43475 43496 43512 43517 43605 43677 43767 43815 43875 43966 43977 44041 44143 44253 44314 44385 44386 44421 44807 44867 44897 44954 45023 45108 45175 45178 45238 45275 45427 45466 45566 45628 45775 45820 45834 46068 46094 46132 46138 46203 46208 46215 46311 46363 46376 46744 47012 47192 47242 47356 47357 47523 47598 47621 47632 47644 47647 47673 47900 47950 47979 48029 48061 48089 48111 48117 48127 48205 48216 48291 48643 48765 48817 48957 48990 491391.5062136169708525e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/136/1290?format=asciiOpticalInfrareddefaultJ/AJ/136/1290/table2Previously known cool dwarfs recovered in the 2MUF samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Designation (HHMMSSss+DDMMSSs)meta.id;meta.mainchar2MUCD2MUCD Designationmeta.idintONameOther Namesmeta.idcharJmag2MASS J magnitudemagphot.mag;em.IR.JfloatJ-H2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatJ-Ks2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatSpTOptical Spectral Type (G1)src.spTypecharn_SpT[e] e: Spectral type based on new observationsmeta.notecharJMAG? Absolute J magnitudemagphys.magAbs;em.IR.Jfloatnullablee_JMAG? rms uncertainty on JMAGmagstat.errorfloatnullablen_JMAG[d] Note on JMAG (1)meta.notecharDistHeliocentric distancepcpos.distancefloate_Distrms uncertainty on Distpcstat.errorfloatn_Dist[d] Note on Dist (1)meta.notecharRefReferences, in refs.dat file (G2)meta.ref;meta.filecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/table3M6-L8 dwarfs discovered within 20pc2MUCD? 2MUCD Designationmeta.idintnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Designation (HHMMSSss+DDMMSSs)meta.id;meta.maincharONameOther Namesmeta.idcharJmag? 2MASS J magnitudemagphot.mag;em.IR.JfloatnullableJ-H? 2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatnullableJ-Ks? 2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatnullableObsDateObservation date(s)time.epoch;obscharTelTelescope usedinstr.setupcharSpTOptical Spectral Type (G1)src.spTypecharn_SpT[ef] Note on Sptype (1)meta.notecharJMAG? Absolute J magnitudemagphys.magAbs;em.IR.Jfloatnullablee_JMAG? rms uncertainty on JMAGmagstat.errorfloatnullablen_JMAG[g] Note on JMAG (1)meta.notecharl_Dist[~] Limit flag on Distmeta.code.errorcharDist? Heliocentric distancepcpos.distancefloatnullablee_Dist? rms uncertainty on Distpcstat.errorfloatnullablen_Dist[d] Note on Dist (1)meta.notecharRefReferences, in refs.dat file (G2)meta.ref;meta.filecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/table4Ultracool dwarfs at distances exceeding 20pcl_Dist[~] Approximate flag in Distmeta.code.errorcharDistHeliocentric distancepcpos.distancefloate_Dist? Uncertainty in Distpcstat.errorfloatnullablef_Dist[e] Problem in distance (3)meta.codecharRefReference, in refs.dat file (G2)meta.ref;pos.frame;meta.filecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS designationmeta.id;meta.maincharn_2MASS[ghi] Individual notes (1)meta.notechar2MUCDIAU designationmeta.idintONameOther identificationmeta.idcharJmag2MASS J band magnitudemagphot.mag;em.IR.JfloatJ-H2MASS (J-H) band colormagphot.color;em.IR.J;em.IR.HfloatJ-Ks2MASS (J-Ks) band colormagphot.color;em.IR.J;em.IR.KfloatObsDate? UT date of observationtime.epoch;obscharTelTelescope used in observationinstr.setup;obscharSpTSpectral type (G1)src.spTypecharn_SpT[df] Spectrum perculiarities (2)meta.notecharJMAG? Absolute J band magnitudemagphys.magAbs;em.IR.Jfloatnullablee_JMAG? Uncertainty in JMAGmagstat.errorfloatnullableJ/AJ/136/1290/table5Spectroscopically confirmed giantsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Designation (HHMMSSss+DDMMSSs)meta.id;meta.maincharJmag2MASS J magnitudemagphot.mag;em.IR.JfloatJ-H2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatJ-Ks2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatObsDateObservation date(s)time.epoch;obscharTelTelescope usedinstr.setupcharl_SpT[>] Limit on SpT (later)meta.code.errorcharSpTOptical Spectral Type (G1)src.spTypecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/table6Spectroscopically confirmed Carbon starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Designation (HHMMSSss+DDMMSSs)meta.id;meta.maincharJmag2MASS J magnitudemagphot.mag;em.IR.JfloatJ-H2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.HfloatJ-Ks2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatObsDateObservation date(s)time.epoch;obscharTelTelescope usedinstr.setupcharl_SpT[>] Limit on SpT (later)meta.code.errorcharSpTOptical Spectral Type (G1)src.spTypecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/table7L dwarf spectral standardsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_2MASS[SP] (S)econdary or (P)rimary standards (1)meta.notechar2MASS2MASS designation (HHMMSSss+DDMMSSs)meta.id;meta.mainchar2MUCD2MUCD designationmeta.idcharONameOther Namemeta.idcharSpTSpectral Typesrc.spTypecharJmag2MASS J magnitudemagphot.mag;em.IR.Jfloatpm? Proper motionarcsec/yrpos.pmfloatnullablee_pm? rms uncertainty on pmarcsec/yrstat.errorfloatnullablepmPA? Position angle of proper motiondegpos.pm;pos.posAngfloatnullablee_pmPA? rms uncertainty on pmPAdegstat.errorfloatnullableCrH-aCrH-a spectral index (1)spect.indexfloatRb-b/TiO-bRb-b/TiO-b spectral index (1)spect.indexfloatCs-a/VO-bCs-a/VO-b spectral index (1)spect.indexfloatColor-d? Color-d spectral index (1)spect.indexfloatnullableMul?[Y/N?] Multiple?meta.code.multipcharRefReferences, in refs.dat filemeta.ref;meta.filecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/table8L dwarfs with Lithium absorptionn_2MASS[ab] Discovery code (1)meta.notechar2MASS2MASS Designation (HHMMSSss+DDMMSSs) (G3)meta.id;meta.mainchar2MUCD2MUCD Designationmeta.idintSpTSpectral Typesrc.spTypecharEWLithium equivalent width0.1nmspect.line.eqWidthfloatDistHeliocentric distancepcpos.distancefloatJMAG? Absolute J magnitudemagphys.magAbs;em.IR.JfloatnullableNotesNotes (2)meta.noteMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/AJ/136/1290/table9L dwarf systems within 20pc of the SunrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqSequential numbermeta.recordintn_Seq[a] NICMOS observation (1)meta.notechar2MASS2MASS Designation (HHMMSSss+DDMMSSs) (G3)meta.id;meta.maincharm_2MASSMultiplicity index on 2MASSmeta.code.multipchar2MUCD? 2MUCD Designation (2)meta.idintnullablem_2MUCDMultiplicity index on 2MUCDmeta.code.multipcharSpTSpectral Typesrc.spTypecharJmag2MASS J magnitudemagphot.mag;em.IR.Jfloatu_JmagUncertainty flag on Jmagmeta.code.errorcharJ-H? 2MASS J-H colour indexmagphot.color;em.IR.J;em.IR.Hfloatnullableu_J-HUncertainty flag on J-Hmeta.code.error;phot.color;em.IR.JcharJ-Ks? 2MASS J-Ks colour indexmagphot.color;em.IR.J;em.IR.Kfloatnullableu_J-KsUncertainty flag on J-Ksmeta.code.error;phot.color;em.IR.JcharDist? Heliocentric distancepcpos.distancefloatnullableDist2? Second value of Distancepcpos.distance;pos.heliocentricfloatnullableSource[sp trig] Sourcemeta.codecharNotesNotes and referencesmeta.noteRefReferences, in refs.dat filemeta.ref;meta.filecharMSimbad column added by the CDSmeta.notechar_RAPosition, from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPosition, from 2MASS name (declination part)degpos.eq.dec;meta.mainJ/AJ/136/1290/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notechar