J/A+A/629/A67ivo://CDS.VizieR/J/A+A/629/A67doi:10.26093/cds/vizier.36290067CDSSousa A.P.Alencar S.H.P.Rebull L.M.Espaillat C.C.Calvet N.,Teixeira P.S.2019-11-27T13:55:11Z2019-09-05T09:22:17ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsline-intensitieseffective-temperatureUnderstanding disk dissipation is essential for studying how planets form. Disk gaps and holes, which almost correspond to dust-free regions, are inferred from infrared observations of T Tauri stars (TTS), indicating the existence of a transitional phase between thick accreting disks and debris disks. Transition disks are usually referred to as candidates for newly formed planets. We searched for transition disk candidates belonging to NGC 2264. Using stellar and disk parameters obtained in the observational multiwavelength campaign CSI 2264, we characterized accretion, disk, and stellar properties of transition disk candidates and compared them to systems with a full disk and diskless stars. We modeled the spectral energy distribution (SED) of a sample of 401 TTS, observed with both CFHT equipped with MegaCam and IRAC instrument on the Spitzer, with Hyperion SED fitting code using photometric data from the U band (0.3um) to the Spitzer/MIPS 24um band. We used the SED modeling to distinguish transition disk candidates, full disk systems, and diskless stars. We classified ~52% of the sample as full disk systems, ~41% as diskless stars, and ~7% of the systems as transition disk candidates, among which seven systems are new transition disk candidates belonging to the NGC 2264 cluster. The sample of transition disk candidates present dust in the inner disk similar to anemic disks, according to the {alpha}_IRAC_ classification, which shows that anemic disk systems can be candidate transition disks. We show that the presence of a dust hole in the inner disk does not stop the accretion process since 82% of transition disk candidates accrete and show H{alpha}, UV excess, and mass accretion rates at the same level as full disk systems. We estimate the inner hole sizes, ranging from 0.1 to 78AU, for the sample of transition disk candidates. In only ~18% of the transition disk candidates, the hole size could be explained by X-ray photoevaporation from stellar radiation.2019A&A...629A..67Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/629/A67CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)J/AJ/123/1528 : UBV(RI)_C_ and JHK photometry in NGC 2264 (Rebull+, 2002)J/AJ/129/829 : H{alpha} emission stars in NGC 2264 (Dahm+, 2005)J/A+A/570/A82 : Mapping accretion variability in NGC 2264 (Venuti+, 2014)J/A+A/586/A47 : Accretion process in NGC 2264 (Sousa+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/629/A67https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/629/A67http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/629/A67https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/629/A67https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/629/A67http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/629/A67GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/629/A67/table3 (Observational parameters of our of diskless stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A67/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A67/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A67/table3?GETtext/xml+votable180.050000true100.30508339.91908330.005555555555555556Cone search capability for table J/A+A/629/A67/table2 (Observational parameters of our of full disk systems)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A67/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A67/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A67/table2?GETtext/xml+votable180.050000true100.4710059.96740530.0055555555555555566/23636-23637 23639https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/629/A67?format=asciidefaultJ/A+A/629/A67/table3Observational parameters of our of diskless starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonInternal identification of the CSI 2264 campaign (CSIMon-NNNNNN in Simbad)meta.id;meta.mainint2Mass2MASS identificationmeta.idcharSpTypeSpectral type (G1)src.spTypecharEWHaS16? H{alpha} equivalent width from Sousa et al., 2016, Cat. J/A+A/586/A47 (G2)0.1nmspect.line.eqWidth;em.line.HalphafloatnullableW10? H{alpha} width at 10% of maximum intensity from Sousa et al., 2016, Cat. J/A+A/586/A47km/sspect.line.width;em.line.HalphaintnullableEWHaD05? H{alpha} equivalent width obtained by Dahm et al., 2005, Cat. J/AJ/129/8290.1nmspect.line.eqWidth;em.line.Halpha;meta.modelledfloatnullableClass[cw] Classification as CTTS (c) and WTTS (w) by Sousa et al., 2016, Cat. J/A+A/586/A47 and Venuti et al., 2014, Cat. J/A+A/570/A82meta.code.classcharalphaIRACSlope of the spectral energy distribution between 3.6 and 8 micrometer obtained by Teixeira et al., 2012A&A...540A..83Tspect.indexfloatR*Stellar radius from Venuti et al., 2014, Cat. J/A+A/570/A82solRadphys.size.radiusfloatTeffEffective temperature Venuti et al., 2014, Cat. J/A+A/570/A82Kphys.temperature.effectiveintUVexcUV excess from Venuti et al., 2014 Cat. J/A+A/570/A82magphot.color.excessfloatdM/dtHa? H{alpha} mass accretion rate from Sousa et al., 2016, Cat. J/A+A/586/A4solMass/yrarith.rate;phys.massfloatnullableDist? Distance from the Sun which was obtained from the Gaia parallax datapcpos.distance;pos.heliocentricfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/A+A/629/A67/table2Observational parameters of our of full disk systemsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMonInternal identification of the CSI 2264 campaign (CSIMon-NNNNNN in Simbad)meta.id;meta.mainint2Mass2MASS identificationmeta.idcharSpTypeSpectral type (G1)src.spTypecharEWHaS16? H{alpha} equivalent width from Sousa et al., 2016, Cat. J/A+A/586/A47 (G2)0.1nmspect.line.eqWidth;em.line.HalphafloatnullableW10? H{alpha} width at 10% of maximum intensity from Sousa et al., 2016, Cat. J/A+A/586/A47km/sspect.line.width;em.line.HalphaintnullableEWHaD05? H{alpha} equivalent width obtained by Dahm et al., 2005, Cat. J/AJ/129/8290.1nmspect.line.eqWidth;em.line.Halpha;meta.modelledfloatnullableClass[cw] Classification as CTTS (c) and WTTS (w) by Sousa et al., 2016, Cat. J/A+A/586/A47 and Venuti et al., 2014, Cat. J/A+A/570/A82meta.code.classcharalphaIRACSlope of the spectral energy distribution between 3.6 and 8 micrometer obtained by Teixeira et al., 2012A&A...540A..83Tspect.indexfloatR*? Stellar radius from Venuti et al., 2014, Cat. J/A+A/570/A82solRadphys.size.radiusfloatnullableTeffEffective temperature from Venuti et al., 2014, Cat. J/A+A/570/A82Kphys.temperature.effectiveintUVexcUV excess from Venuti et al., 2014 Cat. J/A+A/570/A82magphot.color.excessfloatdM/dtUV? UV excess mass accretion rate from Venuti et al., 2014, Cat. J/A+A/570/A82solMass/yrarith.rate;phys.massfloatnullabledM/dtHa? H{alpha} mass accretion rate from Sousa et al., 2016, Cat. J/A+A/586/A47solMass/yrarith.rate;phys.massfloatnullableDist? Distance from the Sun which was obtained from the Gaia parallax datapcpos.distance;pos.heliocentricfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main