J/AJ/166/5ivo://CDS.VizieR/J/AJ/166/5doi:10.26093/cds/vizier.51660005CDSOwens D.Xu S.Manjavacas E.Leggett S.K.Casewell S.L.Dennihy E.,Dufour P.Klein B.L.Yeh S.Zuckerman B.2024-11-06T20:18:47Z2024-02-09T06:24:58ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsinfrared-astronomyspectroscopyExcess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with Keck/MOSFIRE, Gemini/GNIRS, and Gemini/Flamingos-2 of seven white dwarfs with infrared excesses identified in previous studies. We confirmed the presence of dust disks around four white dwarfs (GaiaJ0611-6931, GaiaJ0006+2858, GaiaJ2100+2122, and WD0145+234) as well as two new white dwarf-brown dwarf pairs (GaiaJ0052+4505 and GaiaJ0603+4518). In three of the dust disk systems, we detected for the first time near-infrared metal emissions (MgI, SiI, and possibly FeI) from a gaseous component of the disk. We developed a new Markov Chain Monte Carlo framework to constrain the geometric properties of each dust disk. In three systems, the dust disk and the gas disk appear to coincide spatially. For the two brown dwarf-white dwarf pairs, we identified broad molecular absorption features typically seen in L dwarfs. The origin of the infrared excess around GaiaJ0723+6301 remains a mystery. Our study underlines how near-infrared spectroscopy can be used to determine sources of infrared excess around white dwarfs, which has now been detected photometrically in hundreds of systems.2023AJ....166....5Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/166/5CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/354 : StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022)J/AJ/131/2722 : New L and T dwarfs from the SDSS (Chiu+, 2006)J/ApJ/663/1291 : DZ stars in SDSS DR4 (Dufour+, 2007)J/ApJS/197/38 : The WIRED survey. II. (Debes+, 2011)J/MNRAS/417/1210 : DA-white dwarfs from SDSS and UKIDSS (Girven+, 2011)J/MNRAS/449/574 : Circumstellar discs at white dwarfs (Rocchetto+, 2015)J/ApJ/898/84 : Spectro follow-up of 100pc WDs in SDSS & Gaia (Kilic+, 2020)J/ApJ/902/127 : Bright Gaia white dwarfs with unWISE photometry (Xu+, 2020)J/MNRAS/508/3877 : Catalogue of white dwarfs in Gaia EDR3 (Gentile+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/166/5https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/166/5http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/166/5https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/166/5https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/166/5http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/166/5GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/166/5/table1 (White dwarf parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/166/5/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/166/5/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/166/5/table1?GETtext/xml+votable180.050000true1.64475528.9796550.0055555555555555566/2068 2682 6842 7727 13059 20328 37512https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/166/5?format=asciiInfrareddefaultJ/AJ/166/5/table1White dwarf parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameWhite dwarf identifiermeta.id;meta.maincharRAJ2000[1/316] Degree of right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-70/64] Degree of declination (J2000)degpos.eq.dec;meta.mainDist[29.4/152] Distancepcpos.distance;src.orbitalfloate_Dist[0.02/2] Error on Distpcstat.errorfloatSpTSpectral type; DA or DAZsrc.spTypecharTeff[7749/25565] Effective temperatureKphys.temperature.effectiveinte_Teff[77/1000] Error on TeffKstat.error;phys.temperature.effectiveintlogg[7.92/8.14] Surface gravitycm.s**-2phys.gravityfloate_logg[0.01/0.1] Error on loggcm.s**-2stat.errorfloatl_[Ca/H][<] Limit sign of [Ca/H]meta.code.error;phys.abundchar[Ca/H][-8.8/-6.03] Ca/H ratio logstat.fit.omcfloate_[Ca/H][0.1/0.2]? Error on [Ca/H]stat.error;phys.abundfloatnullablef_[Ca/H]An a flag means new analysis from this papermeta.codecharl_MCa[<] Limit flag on MCameta.code.errorcharMCa[16000/8.2e+06] Ca rate of flowg/stime;arith.ratiodoubleRefReference usedmeta.ref;instr.setupcharJ/AJ/166/5/fig38 white dwarfs IR spectroscopyrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identifiermeta.id;meta.maincharwaveWavelength axisumem.wl;em.IRdoubleflux? Flux axisJyphot.flux;em.IRdoublenullable