J/ApJ/924/114ivo://CDS.VizieR/J/ApJ/924/114doi:10.26093/cds/vizier.19240114CDSAganze C.Burgasser A.J.Malkan M.Theissen C.A.Tejada Arevalo R.A.,Hsu C.-C.Bardalez Gagliuffi D.C.Ryan R.E.Holwerda B.2023-11-09T13:05:00Z2023-09-05T17:05:00ZCDS support team

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

cds-question@unistra.frhst-photometryvisible-astronomyspectroscopystellar-spectral-typesstellar-distancel-dwarfsm-starsbrown-dwarfsinfrared-sourcessurveysUltracool dwarf stars and brown dwarfs provide a unique probe of large-scale Galactic structure and evolution; however, until recently spectroscopic samples of sufficient size, depth, and fidelity have been unavailable. Here, we present the identification of 164 M7-T9 ultracool dwarfs in 0.6deg^2^ of deep, low-resolution, near-infrared spectroscopic data obtained with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) instrument as part of the WFC3 Infrared Spectroscopic Parallel Survey and the 3D-HST survey. We describe the methodology by which we isolate ultracool dwarf candidates from over 200000 spectra, and show that selection by machine-learning classification is superior to spectral index-based methods in terms of completeness and contamination. We use the spectra to accurately determine classifications and spectrophotometric distances, the latter reaching to ~2kpc for L dwarfs and ~400pc for T dwarfs.2022ApJ...924..114Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/924/114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/261 : GOODS initial results (Giavalisco+, 2004)II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/126/1526 : IR photometry of ultracool dwarfs (Bouy+, 2003)J/MNRAS/358/13 : Faint dwarfs in NGC 2547 (Jeffries+, 2005)J/other/ARA+A/43.195 : L and T dwarf stars (Kirkpatrick, 2005)J/ApJ/637/1067 : NIR spectral classification of T dwarfs (Burgasser+, 2006)J/AJ/133/439 : Luminosity function of M7-L8 ultracool dwarfs (Cruz+, 2007)J/ApJ/676/1281 : L and T dwarfs in 2MASS/SDSS (Metchev+, 2008)J/ApJ/695/1591 : Spectrophotometry in PEARS fields (Pirzkal+, 2009)J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)J/A+A/522/A112 : i'z' phot. of L5 and later dwarf candidates (Reyle+, 2010)J/MNRAS/414/2602 : Automated classification of HIP variables (Dubath+, 2011)J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/ApJ/769/80 : Spitzer/IRAC observations of five deep fields (Ashby+, 2013)J/ApJ/788/77 : MW L/T/M-dwarfs identified in BoRG survey (Holwerda+, 2014)J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/ApJS/225/27 : 3D-HST Survey: grism sp. master catalog (Momcheva+, 2016)J/A+A/598/A92 : New ultracool subdwarfs (Lodieu+, 2017)J/MNRAS/465/3203 : GALAH observational overview (Martell+, 2017)J/ApJS/234/1 : M, L, & T dwarfs from PS1 3{pi} Survey (Best+, 2018)J/MNRAS/489/5301 : DES Y3 substellar LT and M catalogs (Carnero Rosell+, 2019)J/AJ/158/75 : Mid-type M dwarfs with planets (Hardegree-Ullman+, 2019)J/ApJS/240/19 : Parallaxes of late-T and Y dwarfs (Kirkpatrick+, 2019)J/AJ/157/101 : Cloud Atlas: HST/WFC3 NIR sp. library (Manjavacas+, 2019)J/ApJ/898/77 : NIR spectra of 2 extreme T-type subdwarfs (Schneider+, 2020)J/ApJS/253/7 : A full-sky census of BDs within 20pc (Kirkpatrick+, 2021)http://archive.stsci.edu/prepds/wisp/ : The WISP Survey on MASThttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/924/114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/924/114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/924/114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/924/114https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/924/114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/924/114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/924/114/ucdwarfs (Late M (Table 3) and L and T (Table 4) dwarfs identified in WISPS and 3D-HST data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/924/114/ucdwarfs?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/924/114/ucdwarfs?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/924/114/ucdwarfs?GETtext/xml+votable180.050000true2.9537083-6.89613890.005555555555555556Cone search capability for table J/ApJ/924/114/table11 (*Additional late-type M dwarfs identified in WISPS and 3D-HST data)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/924/114/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/924/114/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/924/114/table11?GETtext/xml+votable180.050000true1.4047917-50.21638890.0055555555555555566/4215 4515 4755 5061 5072 5262 5264 5274 5305 5413 5481 5657 5698 5855 5882 5929 5967 5985 7176 7381 7426 7761 7903 8359 8451 8469 8480 8555 8559 8845 8867 8915 8919 8923 8927 8952 9146 9174 9215 9305 9346 9440 9680 9705 9783 10170 10219 10251 10261 10298 10300 10316 10325 10336 10405 10418 10468 10624 10789 11086 11157 11239 11252 11355 11425 11434 11557 11596 11781 12222 13643 15247 16881 17360 17515 17679 17690 17746 17990 18556 19045 19350 19691 19776 20125 21126 21432 22626 22818 23333 23376 25169 25385 25388 25392 25932 26097 26259 26423 26457 27006 27250 27258 27428 27486 27515 27568 27781 28247 28548 30873 31216 31291 31407 32930 32986 35018 35360 35741 35935 36278 38821 38837 40213 40255 40258 40279 43966 44542 45132 45353 46424 46549 46795 47510 48290 48614 48719 49078 490941.1796835550914393e-19 2.052997531460547e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/924/114?format=asciiOpticalInfrareddefaultJ/ApJ/924/114/ucdwarfsLate M (Table 3) and L and T (Table 4) dwarfs identified in WISPS and 3D-HST dataE_Dist[13/50000000] Upper uncertainty in Distpcstat.error;stat.maxinte_Dist[10/1168] Lower uncertainty in Distpcstat.errorintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDDesignation (JHHMMSSss+DDMMSSs)meta.id;meta.maincharFieldField identifiermeta.id;obs.fieldcharF110W[18.68/24.4]? HST/WFC3 F110W apparent AB magnitudemagphot.mag;em.IR.Jfloatnullablee_F110W[0.001/0.2]? Uncertainty in F110Wmagstat.errorfloatnullableF140W[16.69/24.6]? HST/WFC3 F140W apparent AB magnitudemagphot.mag;em.IR.Jfloatnullablee_F140W[0.001/0.07]? Uncertainty in F140Wmagstat.errorfloatnullableF160W[15.74/25]? HST/WFC3 F160W apparent AB magnitudemagphot.mag;em.IR.HfloatnullableSpTSpectral typesrc.spTypechare_F160W[0/0.3]? Uncertainty in F160Wmagstat.errorfloatnullableSNR[3/518] Signal-to-Noise in the J-band continuumstat.snrinte_SpT[0.5/9.3] Uncertainty in SpTstat.errorfloatDist[49/3145] Distancepcpos.distance;pos.heliocentricintSelSelection method (s) (G1)meta.codecharCatDisplay data from 3D-HST cat. (Skelton+, 2014, J/ApJS/214/24 and Momcheva+, 2016, J/ApJS/225/27) within 0.3"meta.ref.urlintnullable_RAPositions from names (right ascension part)degpos.eq.ra;meta.main_DEPositions from names (declination part)degpos.eq.dec;meta.mainJ/ApJ/924/114/table11*Additional late-type M dwarfs identified in WISPS and 3D-HST datarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDDesignation (JHHMMSSss+DDMMSSs)meta.id;meta.maincharFieldField identifiermeta.id;obs.fieldcharF110W[18.3/23.6]? HST/WFC3 F110W apparent AB magnitudemagphot.mag;em.IR.Jfloatnullablee_F110W[0.001/0.02]? Uncertainty in F110Wmagstat.errorfloatnullableF140W[17.27/23]? HST/WFC3 F140W apparent AB magnitudemagphot.mag;em.IR.Jfloatnullablee_F140W[0/0.04]? Uncertainty in F140Wmagstat.errorfloatnullableF160W[16.6/23.2]? HST/WFC3 F160W apparent AB magnitudemagphot.mag;em.IR.Hfloatnullablee_F160W[0/0.04]? Uncertainty in F160Wmagstat.errorfloatnullableSNR[3/403] Signal-to-Noise in the J-band continuumstat.snrintSpTAdopted spectral typesrc.spTypechare_SpT[0.5/3] Uncertainty in SpTstat.errorfloatSpTSSSpectral type by using spectral standardssrc.spTypechare_SpTSS[0.5/7.3] Uncertainty in SpTSSstat.errorfloatDist[120/2286] Distancepcpos.distance;pos.heliocentricintE_Dist[36/942] Upper uncertainty in Distpcstat.error;stat.maxinte_Dist[30/548] Lower uncertainty in Distpcstat.errorintSelSelection method (s) (G1)meta.codecharCatDisplay data from 3D-HST cat. (Skelton+, 2014, J/ApJS/214/24 and Momcheva+, 2016, J/ApJS/225/27) within 0.3"meta.ref.urlintnullable_RAPositions from names (right ascension part)degpos.eq.ra;meta.main_DEPositions from names (declination part)degpos.eq.dec;meta.main