J/AJ/154/46ivo://CDS.VizieR/J/AJ/154/46doi:10.26093/cds/vizier.51540046CDSEsplin T.L.Luhman K.L.Faherty J.K.Mamajek E.E.Bochanski J.J.2019-04-02T11:17:57Z2017-10-17T08:05:46ZCDS support team

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

cds-question@unistra.frstellar-associationsdwarf-starsstellar-spectral-typesproper-motionsextinctioninfrared-photometryWe have performed a search for planetary-mass brown dwarfs in the Chamaeleon I star-forming region using proper motions and photometry measured from optical and infrared images from the Spitzer Space Telescope, the Hubble Space Telescope, and ground-based facilities. Through near-IR spectroscopy at Gemini Observatory, we have confirmed six of the candidates as new late-type members of Chamaeleon I ({>=}M8). One of these objects, ChaJ11110675-7636030, has the faintest extinction-corrected M_K_ among known members, which corresponds to a mass of 3-6M_Jup_ according to evolutionary models. That object and two other new members have redder mid-IR colors than young photospheres at {<=}M9.5, which may indicate the presence of disks. However, since those objects may be later than M9.5 and the mid-IR colors of young photospheres are ill-defined at those types, we cannot determine conclusively whether color excesses from disks are present. If ChaJ11110675-7636030 does have a disk, it would be a contender for the least-massive known brown dwarf with a disk. Since the new brown dwarfs that we have found extend below our completeness limit of 6-10M_Jup_, deeper observations are needed to measure the minimum mass of the initial mass function in Chamaeleon I.2017AJ....154...46Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/denis : The DENIS database (DENIS Consortium, 2005)II/328 : AllWISE Data Release (Cutri+ 2013)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/A+A/601/A97 : Gaia-ESO Survey: Cha I members (Sacco+, 2017)J/A+A/575/A4 : Activity and accretion in {gamma} Vel and ChaI (Frasca+, 2015)J/ApJ/788/40 : Late-type targets in Taurus, Cha I, and U Sco (Todorov+, 2014)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/ApJ/675/1375 : IRAC/MIPS photometry in Cha I (Luhman+, 2008)J/ApJS/173/104 : Stellar population in Chamaeleon I (Luhman, 2007)J/AJ/124/1001 : JHKs photometry of Cha I variables (Carpenter, 2002)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/46https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/154/46/table1 (Members of Chamaeleon I)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/46/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/46/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/46/table1?GETtext/xml+votable180.050000true161.6579269-77.60099580.0055555555555555565/9239 9282 6/36953 36955 37122 37123 371326.772611666688002e-21 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/154/46?format=asciiInfrareddefaultJ/AJ/154/46/table1Members of Chamaeleon ISimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (1)meta.id;meta.maincharOName? Other source namemeta.idcharMIRIndicates Mid-InfraRed (MIR) photometry for members found since Luhman 2008 (Cat. J/ApJ/675/1375) (table4)meta.numberintnullableNewIndicates a new member (table3)meta.ref.urlcharSpT? Adopted spectral typesrc.spTypecharr_SpT? Spectral type reference (2)meta.ref;pos.framecharpmRA[-22.7/-2]? IRAC relative proper motion in Right Ascensionmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA[0/7.9]? Error in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-8.1/19.5]? IRAC relative proper motion in Declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0/9.8]? Error in pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullablef_pmDE? Flag on IRAC relative proper motions (err, nodet, out, sat, or unres) (3)meta.codecharAJ[0/5.6]? Extinction in Jmagphys.absorptionfloatnullabler_AJ? Reference for AJ (4)meta.ref;pos.framecharJmag[7.15/19.74]? J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0/0.15]? Error in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[6.67/18.39]? H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0/0.17]? Error in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag[5.94/17.19]? Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0/0.12]? Error in Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullabler_Ksmag? JHK magnitude reference (5)meta.ref;pos.framecharOCatOther catalogs within 3''meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharAllWISEDisplay the AllWISE data (Cutri et al. 2013, Cat. II/328)meta.ref.urlchar_RAPosition from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPosition from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/AJ/154/46/table3New members of Chamaeleon IrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource name (1)meta.id;meta.maincharSpTSpectral typesrc.spTypecharSpectSpectrographmeta.id;instrcharMIRDisplay the Mid-InfraRed (MIR) photometry (table4)meta.ref.urlcharpmDisplay the proper motions (pm), spectral types and JHK magnitude (table1)meta.ref.urlcharJ/AJ/154/46/table4Mid-infrared photometry for members of Chamaeleon I found since Luhman 2008 (Cat. J/ApJ/675/1375)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.id;meta.maincharf_Name[b] WISE photometric flag for Cha J11100159-7738052 (1)meta.codecharW1mag[9.78/16.57]? W1 magnitude (3.5{mu}m) (2)magphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.02/0.4]? Error in W1magmagstat.error;phot.magfloatnullablef_W1mag[c] Flag on W1mag (c=blended with another star)meta.codecharW2mag[9.69/16.25]? W2 magnitude (4.5{mu}m) (2)magphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.02/0.18]? Error in W2magmagstat.error;phot.magfloatnullablef_W2mag[c] Flag on W2mag (c=blended with another star)meta.codecharl_W3mag[>] Lower limit flag on W3magmeta.code.errorcharW3mag[8.66/13.2]? W3 magnitude (12{mu}m) (2)magphot.flux.density;em.IR.8-15umfloatnullablee_W3mag[0.02/0.24]? Error in W3magmagstat.error;phot.magfloatnullablef_W3mag[d] Flag on W3mag (d) (3)meta.codecharl_W4mag[>] Lower limit flag on W4magmeta.code.errorcharW4mag[7.33/9.73]? W4 magnitude (22{mu}m) (2)magphot.flux.density;em.IR.15-30umfloatnullablee_W4mag[0.03/0.33]? Error in W4magmagstat.error;phot.magfloatnullablef_W4mag[a] Flag on W4mag for false or unreliable detection based on visual inspectionmeta.codechar[3.6][10.23/15.94]? Spitzer/IRAC 3.6{mu}m band magnitude (4)magphot.mag;em.IR.3-4umfloatnullablee_[3.6][0.02/0.02]? Error in [3.6]magstat.errorfloatnullablef_[3.6][out] Outside flag on [3.6] (5)meta.codechar[4.5][10.18/15.67]? Spitzer/IRAC 4.5{mu}m band magnitude (4)magphot.mag;em.IR.4-8umfloatnullablee_[4.5][0.02/0.02]? Error in [4.5]magstat.errorfloatnullablef_[4.5][out] Outside flag on [4.5] (5)meta.codechar[5.8][14.36/15.79]? Spitzer/IRAC 5.8{mu}m band magnitude (4)magphot.flux.density;em.IR.4-8umfloatnullablee_[5.8][0.02/0.13]? Error in [5.8]magstat.errorfloatnullablef_[5.8][out] Outside flag on [5.8] (5)meta.codechar[8.0][13.62/14.74]? Spitzer/IRAC 8.0{mu}m band magnitude (4)magphot.flux.density;em.IR.8-15umfloatnullablee_[8.0][0.02/0.13]? Error in [8.0]magstat.errorfloatnullablef_[8.0][out] Outside flag on [8.0] (5)meta.codechar[24][9]? Spitzer/MIPS 24{mu}m band magnitude (6)magphot.flux.density;em.IR.15-30umfloatnullablee_[24][0.11/0.11]? Error in [24]magstat.errorfloatnullablef_[24][out] Outside flag on [24] (5)meta.codecharExc[NY] Excess? (Yes or No)meta.codecharu_Exc[?] Uncertainty flag on Emeta.code.errorcharNewIndicates a new member (table3)meta.ref.urlcharpmDisplay the proper motions (pm), spectral types and JHK magnitude (table1)meta.ref.urlchar