J/AJ/168/66ivo://CDS.VizieR/J/AJ/168/66doi:10.26093/cds/vizier.51680066CDSBickle T.P.Schneider A.C.Gagne J.Faherty J.K.Rothermich A.,Vos J.M.Suarez G.Kirkpatrick J.D.Meisner A.M.Kuchner M.J.,Burgasser A.J.Marocco F.Casewell S.L.Caselden D.,Bardalez Gagliuffi D.C.The Backyard Worlds: Planet 9 Collaboration2025-02-18T20:12:44Z2024-11-22T07:56:11ZCDS support team

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

cds-question@unistra.frbrown-dwarfsinfrared-astronomyspectroscopystellar-spectral-typesstellar-distanceinfrared-photometryl-dwarfsproper-motionsWe present the discovery of VHS J183135.58-551355.9, an L/T transition dwarf identified as a result of its unusually red near-infrared colors (J-K_S_=3.633+/-0.277mag; J-W2=6.249+/-0.245mag) from the VISTA Hemisphere Survey and CatWISE2020 surveys. We obtain low-resolution near-infrared spectroscopy of VHS J1831-5513 using the Magellan Folded port InfraRed Echellette spectrograph to confirm its extremely red nature and assess features sensitive to surface gravity (i.e., youth). Its near-infrared spectrum shows multiple CH4 absorption features, indicating an exceptionally low effective temperature for its spectral type. Based on proper-motion measurements from CatWISE2020 and a photometric distance derived from its Ks-band magnitude, we find that VHS J1831-5513 is a likely (~85% probability) kinematic member of the {beta} Pictoris moving group. Future radial velocity and trigonometric parallax measurements will clarify such membership. Follow-up mid-infrared or higher-resolution near-infrared spectroscopy of this object will allow for further investigation as to the cause(s) of its redness, such as youth, clouds, and viewing geometry.2024AJ....168...66Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/168/66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/367 : The VISTA Hemisphere Survey (VHS) catalog DR5 (McMahon+, 2020)II/365 : CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021)VII/233 : 2MASS All-Sky Extended Source Catalog (XSC) (IPAC/UMass, 2003-2006)J/ApJ/564/421 : Spectra of T dwarfs. I. (Burgasser+, 2002)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)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/137/1 : PMs and astrometry of late-type dwarfs (Faherty+, 2009)J/ApJS/190/100 : NIR proper motion survey using 2MASS (Kirkpatrick+, 2010)J/ApJS/201/19 : Hawaii Infrared Parallax Program. I. (Dupuy+, 2012)J/ApJ/752/56 : BDKP. III. Plx for 70 ultracool dwarfs (Faherty+, 2012)J/ApJ/762/88 : Young stellar kinematic group cand. members (Malo+, 2013)J/ApJ/783/121 : BANYAN II. Nearby young assoc. cand. members (Gagne+, 2014)J/AJ/147/34 : SpeX library of L-type dwarfs (Schneider+, 2014)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/ApJ/810/158 : M,L,T dwarfs fundamental param. and SEDs (Filippazzo+, 2015)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/ApJS/225/10 : Kinematic analysis of M7-L8 dwarfs (Faherty+, 2016)J/ApJ/833/96 : Hawaii infrared plx prog. II. Ultracool dwarfs (Liu+, 2016)J/ApJ/838/73 : BD surface gravities with Keck/NIRSPEC (Martin , 2017)J/AJ/154/69 : ACRONYM II. {beta} Pictoris Moving Group (Shkolnik+, 2017)J/AJ/155/34 : Analysis of NIR sp. of neighboring L dwarfs (Cruz+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/A+A/629/A145 : L9-T3.5 brown dwarfs light curves (Eriksson+, 2019)J/AJ/160/38 : Spitzer variability detections of brown dwarfs (Vos+, 2020)J/ApJ/923/48 : Discovery of an L dwarf co-moving BD+601417 (Faherty+, 2021)J/ApJS/253/7 : A full-sky census of BDs within 20pc (Kirkpatrick+, 2021)J/ApJ/920/99 : Ultracool Dwarfs with Spitzer IR Sp. I. (Suarez+, 2021)J/ApJ/934/178 : L/T transition BDs from NIR SpeX spectra (Ashraf+, 2022)J/MNRAS/513/5701 : Silicate clouds in ultracool dwarfs (Suarez+, 2022)J/AJ/164/239 : IR LC of VHS1256-1257b in 2018 & 2020 epochs (Zhou+, 2022)J/AJ/166/103 : UKIRT Hemisphere Survey L, T & Y dwarfs (Schneider+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/168/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/168/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/168/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/168/66https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/168/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/168/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/168/66/table1 (Properties of VHS J1831-5513)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/168/66/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/168/66/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/168/66/table1?GETtext/xml+votable180.050000true277.89826194-55.232218890.0055555555555555566/472563.830199579824256e-20 1.6978332528839141e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/168/66?format=asciiInfrareddefaultJ/AJ/168/66/table1Properties of VHS J1831-5513Ksmag[16.542] VISTA/VIRCAM Ks-band magnitude (1)magphot.mag;em.IR.Kfloate_Ksmag[0.048] Uncertainty on the Ksmagmagstat.error;phot.mag;em.IR.KfloatW1mag[14.735] WISE W1 (3.4um) band magnitude (2)magphot.mag;em.IR.3-4umfloate_W1mag[0.018] Uncertainty on the W1magmagstat.error;phot.mag;em.IR.3-4umfloatW2mag[13.926] WISE W2 (4.6um) band magnitude (2)magphot.mag;em.IR.4-8umfloate_W2mag[0.016] Uncertainty on the W2magmagstat.error;phot.mag;em.IR.4-8umfloatDist[55.4] Photometric distance from this work (3)pcpos.distancefloate_Dist[5.5] Dist uncertaintypcstat.error;pos.distancefloatSpTSpectral type (NIR) from this worksrc.spType;em.IR.NIRcharFileName of the FITS file in subdirectory "sp"meta.id;meta.fitscharVHSDisplay data from VHS-DR5 (II/367)meta.ref.urlcharWISEADisplay data from AllWISE (II/328)meta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000) (1)degpos.eq.ra;meta.mainfitsDownload the FITS filemeta.ref.urlcharDEJ2000Declination (J2000) (1)degpos.eq.dec;meta.mainpmRA[1.43] Proper motion in right ascension (2)mas/yrpos.pm;pos.eq.rafloate_pmRA[9.6] pmRA uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatpmDE[-84.24] Proper motion in declination (2)mas/yrpos.pm;pos.eq.decfloate_pmDE[10.4] pmDE uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatSimbadNameSimbad column added by the CDSmeta.idcharnullableJmag[20.175] VISTA/VIRCAM J-band magnitude (1)magphot.mag;em.IR.Jfloate_Jmag[0.229] Uncertainty on the Jmagmagstat.error;phot.mag;em.IR.Jfloat