J/ApJ/743/64ivo://CDS.VizieR/J/ApJ/743/64doi:10.26093/cds/vizier.17430064CDSBejar V.J.S.Zapatero Osorio M.R.Rebolo R.Caballero J.A.Barrado D.,Martin E.L.Mundt R.Bailer-Jones C.A.L.2017-07-06T06:26:17Z2013-06-13T12:46:05ZCDS support team

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

cds-question@unistra.frstellar-associationsinfrared-photometrysurveysWe present a deep I, Z photometric survey covering a total area of 1.12deg^2^ of the {sigma} Orionis cluster and reaching completeness magnitudes of I=22 and Z=21.5mag. From I, I-Z color-magnitude diagrams we have selected 153 candidates that fit the previously known sequence of the cluster. They have magnitudes in the range I=16-23mag, which corresponds to a mass interval from 0.1 down to 0.008M_{sun}_ at the most probable age of {sigma} Orionis (2-4Myr). Using J-band photometry, we find that 124 of the 151 candidates within the completeness of the optical survey (82%) follow the previously known infrared photometric sequence of the cluster and are probably members. We have studied the spatial distribution of the very low mass stars and brown dwarf population of the cluster and found that there are objects located at distances greater than 30 arcmin to the north and west of {sigma} Orionis that probably belong to different populations of the Orion's Belt. For the 102 bona fide {sigma} Orionis cluster member candidates, we find that the radial surface density can be represented by a decreasing exponential function ({sigma}={sigma}_0_e^-r/r_0_^) with a central density of {sigma}_0_=0.23+/-0.03 objects arcmin^-2^ and a characteristic radius of r_0_=9.5+/-0.7 arcmin. Using near-infrared JHK-band data from Two Micron All Sky Survey and UKIRT Deep Infrared Sky Survey and mid-infrared data from Infrared Array Camera/Spitzer, we find that about 5%-9% of the brown dwarf candidates in the {sigma} Orionis cluster have K-band excesses and 30%+/-7% of them show mid-infrared excesses at wavelengths longer than 5.8um. These are probably related to the presence of disks, most of which are "transition disks".2011ApJ...743...64Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/743/64CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/191/389 : Photometric monitoring in {sigma} Ori cluster (Cody+, 2010)J/A+A/493/931 : MAD observations of {sigma} Ori (Bouy+, 2009)J/A+A/478/667 : The Mayrit catalogue (Caballero, 2008)J/A+A/488/167 : Low-mass stars in {sigma} Ori and {lambda} Ori (Sacco+, 2008)J/ApJ/688/362 : Disks around brown dwarfs in sigma Ori cluster (Luhman+, 2008)J/A+A/485/931 : Young stars and brown dwarfs in Ori OB1b (Caballero+, 2008)J/A+A/466/917 : Brightest stars of sigma Orionis cluster (Caballero+, 2007)J/MNRAS/356/1583 : Sigma Ori low-mass candidate members (Burningham+, 2005)J/MNRAS/356/89 : sigma Ori low-mass stars (Kenyon+, 2005)J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)J/A+A/419/249 : RJHKs photometry of sigma Ori low-mass stars (Scholz+, 2004)J/AN/325/705 : RIJHKs of low-mass stars in sigma Ori (Bejar+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/743/64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/743/64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/743/64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/743/64https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/743/64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/743/64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/743/64/stars (Photometry of survey candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/743/64/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/743/64/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/743/64/stars?GETtext/xml+votable180.050000true84.79175-2.46986110.0055555555555555566/22849 22851 22854 22857 228602.0616683193919197e-20 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/743/64?format=asciiInfrareddefaultJ/ApJ/743/64/starsPhotometry of survey candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFieldField name (SO1 to SO4)obs.fieldcharDetDetector number (D1 to D4)meta.id;instrcharNamePosition-based name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharONamePrevious name (S Ori NN or MNNNNNNN; <[BZR99] S Ori NN> or <Mayrit NNNNNNN> in Simbad)meta.idcharRef? Reference (1)meta.ref;pos.frameintnullableImagINT/WFC Cousins I system magnitudemagphot.mag;em.opt.Ifloate_ImagImag uncertaintymagstat.error;phot.mag;em.opt.IfloatI-ZINT/WFC I-Z color indexmagphot.color;em.opt.I;em.opt.Ifloate_I-ZI-Z uncertaintymagstat.errorfloatl_JmagLimit flag on Jmagmeta.code.errorcharJmag? CAIN J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Jmag uncertaintymagstat.error;phot.mag;em.IR.Jfloatnullabler_Jmag[abcd] Photometry source (2)meta.ref;pos.framecharl_I-JLimit flag on I-Jmeta.code.error;phot.color;em.opt.IcharI-J? I-J color indexmagphot.color;em.IR;em.IRfloatnullablee_I-J? I-J uncertaintymagstat.error;phot.color;em.opt.IfloatnullableJmag2? 2MASS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag2? Jmag2 uncertaintymagstat.error;phot.mag;em.IR.JfloatnullableHmag? 2MASS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Hmag uncertaintymagstat.error;phot.mag;em.IR.Hfloatnullablel_KsmagLimit flag on Ksmagmeta.code.errorcharKsmag? 2MASS Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Ksmag uncertaintymagstat.error;phot.mag;em.IR.KfloatnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainMmMembership code (3)meta.code.membercharUKIDSSDisplay the UKIDSS-DR9 GCS data within 1" (Lawrence et al. 2012, Cat. II/319)meta.ref.urlchar2MDisplay the 2MASS data within 1" (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharImagUUKIDSS I-band magnitudemagphot.mag;em.opt.Ifloate_ImagUImag uncertaintymagstat.error;phot.mag;em.opt.IfloatZmagU? UKIDSS Z-band magnitudemagphot.mag;em.opt.Ifloatnullablee_ZmagU? Zmag uncertaintymagstat.error;pos.cartesian.zfloatnullableYmagU? UKIDSS Y-band magnitudemagphot.mag;em.IR.Jfloatnullablee_YmagU? Ymag uncertaintymagstat.errorfloatnullableJmagU? UKIDSS J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_JmagU? Jmag uncertaintymagstat.error;phot.mag;em.IR.JfloatnullableHmagU? UKIDSS H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_HmagU? Hmag uncertaintymagstat.error;phot.mag;em.IR.HfloatnullableKmagU? UKIDSS K-band magnitudemagphot.mag;em.IR.Kfloatnullablee_KmagU? Kmag uncertaintymagstat.error;phot.mag;em.IR.Kfloatnullable[3.6]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty on [3.6]magmagstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? Uncertainty on [4.5]magmagstat.errorfloatnullable[5.4]? Spitzer/IRAC 5.4um band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.4]? Uncertainty on [5.4]magmagstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty on [8.0]magmagstat.errorfloatnullableE(n)[YN] Near infrared excess? (Y or N)meta.codecharE(m)[YN] Mid-IR excess? (Y or N)meta.codechar