J/MNRAS/429/903ivo://CDS.VizieR/J/MNRAS/429/903doi:10.26093/cds/vizier.74290903CDSDawson P.Scholz A.Ray T.P.Marsh K.A.Wood K.Natta A.Padgett D.,Ressler M.E.2024-07-20T20:14:04Z2014-04-23T14:59:48ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryWe present a census of the disc population for UKIDSS selected brown dwarfs in the 5-10Myr old Upper Scorpius OB association. For 116 objects originally identified in UKIDSS, the majority of them not studied in previous publications, we obtain photometry from the Wide-Field Infrared Survey Explorer data base. The resulting colour-magnitude and colour-colour plots clearly show two separate populations of objects, interpreted as brown dwarfs with discs (class II) and without discs (class III). We identify 27 class II brown dwarfs, 14 of them not previously known. This disc fraction (27 out of 116, or 23%) among brown dwarfs was found to be similar to results for K/M stars in Upper Scorpius, suggesting that the lifetimes of discs are independent of the mass of the central object for low-mass stars and brown dwarfs. 5 out of 27 discs (19%) lack excess at 3.4 and 4.6{mu}m and are potential transition discs (i.e. are in transition from class II to class III). The transition disc fraction is comparable to low-mass stars. We estimate that the time-scale for a typical transition from class II to class III is less than 0.4Myr for brown dwarfs. These results suggest that the evolution of brown dwarf discs mirrors the behaviour of discs around low-mass stars, with disc lifetimes of the order of 5-10Myr and a disc clearing time-scale significantly shorter than 1Myr.2013MNRAS.429..903Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/429/903CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/328 : AllWISE Data Release (Cutri+ 2013)II/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/429/903https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/429/903http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/429/903https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/429/903https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/429/903http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/429/903GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/429/903/bd_stars (Brown dwarf stars with UKIDSS Z and J, WISE W1, W2, W3 and W4 photometries of class II and III objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/429/903/bd_stars?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/429/903/bd_stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/429/903/bd_stars?GETtext/xml+votable180.050000true241.960375-21.42227780.0055555555555555565/10734 11075 11088 6/42908-42909 42911 42925-42929 42931-42933 42942 42949 42951 42984 42987 42990 44289 44292-44293 44304 44306-44307 44312 44341-44343 44348 44356 44358-44359 44364 443848.157980699529898e-21 2.3717893470513554e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/429/903?format=asciiInfrareddefaultJ/MNRAS/429/903/bd_starsBrown dwarf stars with UKIDSS Z and J, WISE W1, W2, W3 and W4 photometries of class II and III objectsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClassDisk class (II or III)src.classnullable2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainZmagUKIDSS Z magnitudemagphot.mag;em.opt.IfloatJmagUKIDSS J magnitudemagphot.mag;em.IR.JfloatW1magWISE W1 magnitudemagphot.mag;em.IR.3-4umfloatW2magWISE W2 magnitudemagphot.mag;em.IR.4-8umfloatW3magWISE W3 magnitudemagphot.flux.density;em.IR.8-15umfloatn_W3mag[a] a: S/N<5meta.notecharW4magWISE W4 magnitudemagphot.flux.density;em.IR.15-30umfloatn_W4mag[a] a: S/N<5meta.notechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharWISEDisplay the WISE data (Cutri et al. 2012, Cat. 311246)meta.ref.urlcharUKIDSSDisplay the UKIDSS-DR9 LAS data (Lawrence et al. 2012, Cat. 311246)meta.ref.urlchar