J/AJ/132/891ivo://CDS.VizieR/J/AJ/132/891doi:10.26093/cds/vizier.51320891CDSReid I.N.Lewitus E.Allen P.R.Cruz K.L.Burgasser A.J.2017-10-03T05:12:38Z2008-05-01T10:13:18ZCDS support team

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

cds-question@unistra.frmultiple-starsinfrared-photometryWe have used the Near-Infrared Camera and Multi-Object Spectrometer NIC1 camera on the Hubble Space Telescope to obtain high angular resolution images of 52 ultracool dwarfs in the immediate solar neighborhood. Nine systems are resolved as binary, with component separations from 1.5 to 15AU. Based on current theoretical models and empirical bolometric corrections, all systems have components with similar luminosities and, consequently, high mass ratios, q>0.8. Limiting analysis to L dwarfs within 20pc, the observed binary fraction is 12%(9-19%). Applying Bayesian analysis to our data set, we derive a mass-ratio distribution that peaks strongly at unity. Modeling the semimajor axis distribution as a logarithmic Gaussian, the best fit is centered at log(a_0_)=0.8AU (a_0_~6.3AU), with a (logarithmic) width of +/-0.3. The current data are consistent with an overall binary frequency of ~24%.2006AJ....132..891Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/132/891CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/123/3409 : SDSS M, L, and T dwarfs (Hawley+, 2002)J/AJ/126/2421 : 2MASS-Selected sample of ultracool dwarfs (Cruz+, 2003)J/A+A/435/363 : Southern Infrared Proper Motion Survey (Deacon+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/132/891https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/132/891http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/132/891https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/132/891https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/132/891http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/132/891GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/132/891/table1 (Unresolved ultracool dwarfs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/891/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/891/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/891/table1?GETtext/xml+votable180.050000true9.06737518.35288890.005555555555555556Cone search capability for table J/AJ/132/891/table23 (Observational data for candidate binaries and inferred properties of binary components)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/891/table23?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/891/table23?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/891/table23?GETtext/xml+votable180.050000true1.1451667-40.73494440.005555555555555556Cone search capability for table J/AJ/132/891/table4 (Additional L dwarf binaries within 20pc)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/132/891/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/132/891/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/132/891/table4?GETtext/xml+votable180.050000true31.3725-11.99155560.0055555555555555566/221 2502 2789 4116 4719 4775 6047 6328 6783 7220 7533 7985 8348 9385 11453 11719 13678 15085 16609 17075 18032 18266 18683 19369 19763 19857 21209 22759 23010 23471 25558 26300 27019 27058 28316 31009 31011 31268 32650 34622 34660 34780 35106 35412 35499 36602 39482 40332 40738 40882 41984 43966 44807 47192 48957 49139https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/132/891?format=asciiInfrareddefaultJ/AJ/132/891/table1Unresolved ultracool dwarfsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSss)meta.id;meta.maincharn_2MASS[*] Individual note (1)meta.notecharSpTypeMK spectral typesrc.spTypecharJmagJ magnitudemagphot.mag;em.IR.JfloatHmagH magnitudemagphot.mag;em.IR.HfloatKsmagKs magnitudemagphot.mag;em.IR.Kfloatm110NIC-F110W magnitude (0.8-1.4um)magphot.mag;em.IR.Jfloatm170NIC-F170M magnitude (1.6-1.8um)magphot.mag;em.IR.HfloatDistDistancepcpos.distance;pos.heliocentricfloate_Distrms uncertainty on Distpcstat.errorfloatr_DistDistance reference (2)meta.ref;pos.framecharNotesDiscovery paper (3)meta.ref;pos.framechar2MDisplay the 2MASS data (Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSchar_RAExplain (right ascension part)degpos.eq.ra;meta.main_DEExplain (declination part)degpos.eq.dec;meta.mainJ/AJ/132/891/table23Observational data for candidate binaries and inferred properties of binary componentsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharm_2MASS[AB] Multiplicity index on 2MASSmeta.code.multipcharSpTypeMK spectral typesrc.spTypecharJmagJ magnitude (1)magphot.mag;em.IR.JfloatHmagH magnitude (1)magphot.mag;em.IR.HfloatKsmagKs magnitude (1)magphot.mag;em.IR.Kfloatu_KsmagUncertainty flag on Ksmagmeta.code.errorcharm110? NIC-F110W magnitude (0.8-1.4um)magphot.mag;em.IR.Jfloatnullablem170? NIC-F170M magnitude (1.6-1.8um)magphot.mag;em.IR.HfloatnullableDist? Distance (2)pcpos.distance;pos.heliocentricfloatnullablee_Dist? rms uncertainty on Distpcstat.errorfloatnullabledelta? Separationarcsecpos.angDistancefloatnullabletheta? Position angledegpos.posAngfloatnullableNotesNotesmeta.notecharRefsReferences (3)meta.ref;pos.framecharJMAG? Absolute J magnitude for componentsmagphys.magAbs;em.IR.JfloatnullableMbol? Absolute bolometric magnitude for components (4)magphys.magAbs.bolfloatnullableM1? Mass for an age of 1Gyr for componentssolMassphys.massfloatnullablen_M1[*] Note on M1 (5)meta.notecharM3? Mass for an age of 3Gyr for componentssolMassphys.massfloatnullableq1? Mass ratio for 1Gyr for componentsphys.mass;arith.ratiofloatnullableq3? Mass ratio for 3Gyr for componentsphys.mass;arith.ratiofloatnullable2MDisplay the 2MASS data (Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSchar_RAExplain (right ascension part)degpos.eq.ra;meta.main_DEExplain (declination part)degpos.eq.dec;meta.mainJ/AJ/132/891/table4Additional L dwarf binaries within 20pcrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSs) (4)meta.id;meta.maincharm_2MASS[AB] Multiplicity index on 2MASSmeta.code.multipcharSpTypeMK spectral typesrc.spTypecharDist? Distancepcpos.distance;pos.heliocentricfloatnullablel_deltaLimit flag on deltameta.code.error;pos.eq.decchardelta? Separationarcsecpos.angDistancefloatnullableJMAG? Absolute J magnitude for componentsmagphys.magAbs;em.IR.JfloatnullableMbol? Absolute bolometric magnitude for components (1)magphys.magAbs.bolfloatnullableM1? Mass for an age of 1Gyr for componentssolMassphys.massfloatnullablen_M1[*] Note on M1 (2)meta.notecharM3? Mass for an age of 3Gyr for componentssolMassphys.massfloatnullableq1? Mass ratio for 1Gyr for componentsphys.mass;arith.ratiofloatnullableq3? Mass ratio for 3Gyr for componentsphys.mass;arith.ratiofloatnullableNotes? Notes (3)meta.noteintnullable2MDisplay the 2MASS data (Cat. II/246)meta.ref.urlcharSimbadSimbad column added by the CDSchar_RAExplain (right ascension part)degpos.eq.ra;meta.main_DEExplain (declination part)degpos.eq.dec;meta.main