J/AJ/133/439ivo://CDS.VizieR/J/AJ/133/439doi:10.26093/cds/vizier.51330439CDSCruz K.L.Reid I.N.Kirkpatrick J.D.Burgasser A.J.Liebert J.,Solomon A.R.Schmidt S.J.Allen P.R.Hawley S.L.Covey K.R.2018-07-02T11:10:51Z2007-10-22T14:05:11ZCDS support team

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

cds-question@unistra.frdwarf-starslate-type-starsinfrared-photometryWe present a 20pc, volume-limited sample of M7-L8 dwarfs created through spectroscopic follow-up of sources selected from the Two Micron All Sky Survey Second Incremental Release Point Source Catalog. In this paper we present optical spectroscopy of 198 candidate nearby ultracool dwarfs, including 12 late-M and L dwarfs likely to be within 20pc of the Sun and 94 more distant late-type dwarfs. We have also identified five ultracool dwarfs with spectral signatures of low gravity. Combining these data with previous results, we define a sample of 99 ultracool dwarfs in 91 systems within 20pc. These are used to estimate the J- and K-band luminosity functions for dwarfs with optical spectral types between M7 and L8 (10.5<M_J_<15, 9.5<M_Ks_<13). We find a space density of 4.9x10^-3^/pc^3^ for late-M dwarfs (M7-M9.5) and a lower limit of 3.8x10^-3^/pc^3^ for L dwarfs.2007AJ....133..439Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/133/439CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/241 : 2MASS Catalog Intermediate Data Release (IPAC/UMass, 2000)II/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 the NLTT catalogue (Reid+, 2004)J/AJ/133/2825 : Activity and kinematics of ultracool dwarfs (Schmidt+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/133/439https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/133/439http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/133/439https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/133/439https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/133/439http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/133/439GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/133/439/dwarfs (Dwarfs discovered (tables 2, 3 and 4 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/133/439/dwarfs?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/133/439/dwarfs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/133/439/dwarfs?GETtext/xml+votable180.050000true20.796667-69.3605560.005555555555555556Cone search capability for table J/AJ/133/439/giants (Spectroscopically confirmed giants and carbon stars (tables 5 and 6 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/133/439/giants?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/133/439/giants?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/133/439/giants?GETtext/xml+votable180.050000true14.25708345.1636110.005555555555555556Cone search capability for table J/AJ/133/439/s20pc (The 20pc 2MU2 used to estimate the luminosity function, and additional stars within 1{sigma} of 20pc (tables 9 and 10 of paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/133/439/s20pc?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/133/439/s20pc?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/133/439/s20pc?GETtext/xml+votable180.050000true4.85916746.2352780.0055555555555555566/281 399 445 906 909 2291 2334 2502 2554 2678 2681 2784 2789 2862 2978 4436 4443 4455 4645 4719 4739 4768 4775 4813 5264 5429 5783 6108 6328 6608 6727 6783 6839 7220 7533 7546 7659 7915 8022 8374 8381 8402 8429 8431 8473 8475 8519 8544 8560 8910 9094 9178 9180 9208 9318 9394 9479 9677 9738 9779 9980 10323 10332 10391 10484 10676 10701 10702 10753 10773 10823 10850 10934 10948 10975 11074 11190 11292 11302 11336 11639 11719 11776 11798 11856 12152 12231 12242 12521 12541 12579 13139 13322 13336 13341 13432 13534 13559 13565 13678 13686 13737 13776 14105 14858 14910 14911 15085 15255 16454 16502 16528 16577 16601 16609 16719 16767 16802 16856 17096 17105 17203 17283 17287 17297 17303 17309 17317 17332 17367 17530 17567 17985 18060 18432 18665 18683 18711 18717 18726 18741 19046 19085 19680 19895 20069 20136 20139 20699 20713 20993 20996 21000 21074 21093 21118 21166 21209 21284 21296 21864 22482 22535 22687 22688 22739 22759 22950 23144 23479 23538 24897 25015 25156 25310 25314 25411 25456 25558 25818 26018 26196 26609 26661 26786 27019 27201 27205 27214 27618 27881 27940 27992 28006 28316 28346 28454 29987 29990 30042 30085 30097 31694 31714 31929 31963 31969 31979 32167 32304 32426 32462 32518 33166 33228 33286 33290 33296 33300 33303 33310 33325 33331 33334 33337 33340 33412 33443 33767 34289 34535 34622 34660 34780 34803 35685 35747 35906 35923 35951 36160 36176 36602 36640 36686 36822 36845 37390 40191 40297 40313 40534 40738 40882 40941 43966 44226 44456 44518 44603 44610 44671 44778 44784 44807 46567 46929 47082 47899 47928 47929 47961 47968 47989 48020 48080 48158 48171 48270 48300 48409 48512 48593 48658 48681 48703 48765 48772 48867 48957 49036 491391.398457827073138e-19 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/133/439?format=asciiInfrareddefaultJ/AJ/133/439/dwarfsDwarfs discovered (tables 2, 3 and 4 of paper)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTabmeta.notechar2MASSIThe 2MASSI designation (G1)meta.id;meta.maincharm_2MASSI[ABC] Multiplicity index on 2MASSImeta.code.multipchar2MUCD? The 2MUCD numbermeta.idintnullableONameOther name(s)meta.idcharn_OName[b] Common proper motion star (2)meta.notecharJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableJ-H? 2MASS (J-H) colormagphot.color;em.IR.J;em.IR.HfloatnullableJ-K? 2MASS (J-K_S_) colormagphot.color;em.IR.J;em.IR.KfloatnullableObs.Date? UT date of observationtime.epochnullableTelTelescope used in the observationinstr.setup;obscharSpTypeOptical spectral typesrc.spTypecharf_SpType[abcde] Individual note on the spectrum (3)meta.codecharJMAGAbsolute J band magnitudemagphys.magAbs;em.IR.Jfloate_JMAGUncertainty in JMAGmagstat.errorfloatDistDistancepcpos.distance;pos.heliocentricfloate_DistUncertainty in Distpcstat.errorfloatf_Dist[l] l: Dist and e_Dist represent the range in the distancemeta.codecharRefsOther references, in refs.dat filemeta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight ascension (derived from 2MASSI) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from 2MASSI) for Eq=J2000degpos.eq.dec;meta.mainJ/AJ/133/439/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeBibCodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/AJ/133/439/giantsSpectroscopically confirmed giants and carbon stars (tables 5 and 6 of paper)JmagJ magnitudemagphot.mag;em.IR.JfloatJ-KsJ-Ks colour indexmagphot.color;em.IR.J;em.IR.KfloatObs.DateUT date of observationtime.epochnullableTelTelescope usedinstr.setupcharSpTypeOptical spectral typesrc.spTypecharn_SpType[b] b: Spectrum displays H{alpha} in emissionmeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight ascension (derived from 2MASSI) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from 2MASSI) for Eq=J2000degpos.eq.dec;meta.main2MASSI2MASSi designation (G1)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintgCsrc.classcharJ-HJ-H colour indexmagphot.color;em.IR.J;em.IR.HfloatJ/AJ/133/439/s20pcThe 20pc 2MU2 used to estimate the luminosity function, and additional stars within 1{sigma} of 20pc (tables 9 and 10 of paper)ONameOther name(s)meta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_2MASSImeta.notechar2MASSIThe 2MASSI designation (G1)meta.id;meta.maincharm_2MASSI[ABC] Multiplicity index on 2MASSImeta.code.multipcharf_2MASSI[eghl] Individual note on 2MASSI (2)meta.codechar2MUCD? The 2MUCD numbermeta.idintnullablen_OName[de] Individual note on OName (3)meta.notecharJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableJ-H? 2MASS (J-H) color indexmagphot.color;em.IR.J;em.IR.HfloatnullableJ-K? 2MASS (J-K_S_) color indexmagphot.color;em.IR.J;em.IR.KfloatnullableSpTypeOptical spectral type (4)src.spTypecharf_SpType[efhijkl] Individual note on spectrum (2)meta.codecharJMAGAbsolute J band magnitudemagphys.magAbs;em.IR.Jfloate_JMAGUncertainty in JMAGmagstat.errorfloatf_JMAG[g] Individual note on JMAG (2)meta.codecharKsMAG? Absolute Ks band magnitudemagphys.magAbs;em.IR.KfloatnullableDistDistancepcpos.distance;pos.heliocentricfloate_KsMAG? Uncertainty in KsMAGmagstat.errorfloatnullablee_DistUncertainty in Distpcstat.errorfloatn_DistMethod of distance determination (7)meta.notecharDRefsDiscovery reference(s) (table9) or reference(s) (table10), in refs.dat filemeta.bibcharPRefsParallax reference(s) (table9), in refs.dat filemeta.bibchar_RARight ascension (derived from 2MASSI) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from 2MASSI) for Eq=J2000degpos.eq.dec;meta.main