J/ApJ/794/143ivo://CDS.VizieR/J/ApJ/794/143doi:10.26093/cds/vizier.17940143CDSBardalez Gagliuffi D.C.Burgasser A.J.Gelino C.R.Looper D.L.,Nicholls C.P.Schmidt S.J.Cruz K.West A.A.Gizis J.E.Metchev S.2018-01-23T07:10:53Z2017-05-19T15:01:57ZCDS support team

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

cds-question@unistra.frdwarf-starsmultiple-starsstellar-spectral-typesinfrared-photometryMultiplicity is a key statistic for understanding the formation of very low mass (VLM) stars and brown dwarfs. Currently, the separation distribution of VLM binaries remains poorly constrained at small separations (<=1 AU), leading to uncertainty in the overall binary fraction. We approach this problem by searching for late-M/early-L plus T dwarf spectral binaries whose combined light spectra exhibit distinct peculiarities, allowing for separation-independent identification. We define a set of spectral indices designed to identify these systems, and we use a spectral template fitting method to confirm and characterize spectral binary candidates from a library of 815 spectra from the SpeX Prism Spectral Libraries. We present 11 new binary candidates, confirm 3 previously reported candidates, and rule out 2 previously identified candidates, all with primary and secondary spectral types in the range M7-L7 and T1-T8, respectively. We find that subdwarfs and blue L dwarfs are the primary contaminants in our sample and propose a method for segregating these sources. If confirmed by follow-up observations, these systems may add to the growing list of tight separation binaries, whose orbital properties may yield further insight into brown dwarf formation scenarios.2014ApJ...794..143Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/794/143CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)J/ApJ/710/1142 : SpeX spectroscopy of low mass binaries. I. (Burgasser+, 2010)J/AJ/147/34 : SpeX library of L-type dwarfs (Schneider+, 2014)J/ApJ/802/L10 : M dwarf SpeX NIR spectroscopy (Terrien+, 2015)J/ApJS/220/16 : SpeX NIR survey of 886 nearby M dwarfs (Terrien+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/794/143https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/794/143http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/794/143https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/794/143https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/794/143http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/794/143GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/794/143/table2 (New SpeX Observations of M7-L6 Dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/794/143/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/794/143/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/794/143/table2?GETtext/xml+votable180.050000true0.1191667-12.75416670.0055555555555555566/207 221 222 281 322 331 369 410 445 464 466 483 487 548 580 586 672 734 736 743 780 858 906 1576 2040 2044 2110 2149 2255 2260 4096 4106 4136 4183 4224 4226 4251 4262 4263 4274 4285 4291 4521 4536 4543 4630 4662 4669 4685 4716 4729 4747 4867 4912 4921 4946 4949 5000 5002 5044 5147 5264 5320 5413 5540 5621 5631 5634 5726 5854 6047 6098 6223 6250 6255 6298 6406 6539 6568 6601 6625 7030 7162 7297 7404 7420 7440 7448 7591 7744 8349 8354 8361 8374 8422 8480 8503 8519 8522 8544 8558 8560 8761 8808 8900 8901 8910 8972 8995 9018 9022 9094 9124 9135 9146 9169 9180 9224 9318 9366 9385 9411 9434 9449 9479 9483 9534 9601 9628 9643 9715 9903 9921 10037 10063 10234 10243 10475 10484 10516 10555 10657 10665 10702 10749 10813 10819 10823 10975 11074 11138 11247 11264 11445 11453 11591 11608 11841 11856 11862 11912 12380 12400 12519 12521 12537 12582 12770 12771 13416 13462 13481 13672 13773 13885 14084 15043 15775 16434 16528 16546 16601 16631 16639 16687 16767 16778 16793 16802 16817 16856 16906 16983 17096 17115 17156 17203 17252 17268 17287 17297 17303 17317 17332 17452 17515 17580 17594 17674 17757 17776 17835 17883 17930 17998 18019 18020 18032 18060 18062 18084 18087 18101 18166 18303 18367 18375 18383 18482 18541 18711 18717 18741 18749 18782 18788 18789 18792 18802 18840 18846 18947 19022 19050 19109 19137 19138 19185 19399 19413 19598 19672 19675 19726 19748 19755 19763 19776 19794 19813 19906 19932 20040 20318 20436 20591 20699 20713 20754 20897 20996 21118 21171 21660 21728 21835 21855 21985 22171 22177 22360 22521 22535 22588 22720 22861 22950 23010 23193 23195 23196 23234 23237 23290 23325 23436 23444 23470 23471 24105 24566 24580 24581 24590 24632 24824 24925 25044 25096 25156 25223 25266 25310 25411 25433 25558 25846 25853 25945 25947 25981 26095 26209 26223 26282 26393 26403 26430 26587 26786 26960 27058 27110 27214 27334 27358 27366 27372 27383 27402 27405 27469 27518 27590 27618 27635 27648 27704 28006 28018 28612 29018 29301 29305 29452 29987 30163 30505 30764 30833 30883 30956 31009 31035 31144 31268 31309 31324 31336 31509 31594 31601 31905 32284 32372 32402 32403 32462 32602 32616 34102 34154 34216 34289 34400 34407 34532 34626 34645 34656 34803 35203 35299 35325 35387 35412 35451 35463 35471 35509 35623 35747 35864 35943 35951 36142 36160 36176 36204 36223 36253 36265 36436 36458 36467 36686 36718 36740 36772 36784 38164 38310 38340 38812 38880 39140 39185 39482 39485 39807 40022 40191 40273 40375 40485 40901 40941 42982 43004 43422 43475 43512 43875 43957 43977 44226 44232 44238 44314 44339 44416 44486 44518 44632 44778 44929 44954 45023 46054 46068 46671 46727 46729 46744 46823 46846 46929 46961 47828 47928 48081 48171 48205 48270 48455 48474 48512 48593 48811 48817 48883 48990 491501.5062136169708525e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/794/143?format=asciiOpticalInfrareddefaultJ/ApJ/794/143/table2New SpeX Observations of M7-L6 DwarfsSimbadNameSimbad column added by the CDSmeta.idcharOSpTypeSpectral type from optical spectrumsrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharIDSource designationmeta.idcharNSpTypeSpectral type from NIR spectrumsrc.spTypecharSSpTypeSpectral type from SpeX observation (1)src.spTypecharJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableJ-Ks? 2MASS (J-K_S_) colormagphot.color;em.IR.J;em.IR.KfloatnullableDateDate of the observationtime.epochnullableResResolutionpos.angResolutionintRefReferences in refs.dat file (2)meta.ref;meta.filechar_RAPositions form Simbad or object name (right ascension part)degpos.eq.ra;meta.mainnullable_DEPositions form Simbad or object name (declination part)degpos.eq.dec;meta.mainnullableJ/ApJ/794/143/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/90] Reference numbermeta.id;meta.mainintBibcodeReference bibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComComment on referencemeta.notechar