J/AJ/165/269ivo://CDS.VizieR/J/AJ/165/269CDSLuhman K.L.2024-01-26T06:26:20Z2024-01-09T07:11:47ZCDS support team

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

cds-question@unistra.frstellar-associationsvisible-astronomyspectroscopyinfrared-photometrystellar-spectral-typesproper-motionstrigonometric-parallaxI have used high-precision photometry and astrometry from the third data release of Gaia to perform a survey for members of the TW Hya association (TWA). I have identified candidate members that appear to share similar kinematics and ages with bona fide members compiled by Gagne et al. (2017), and I have assessed their membership using radial velocities and spectroscopic diagnostics of age from various sources. My new catalog of adopted members contains 67 Gaia sources in 55 systems. The histogram of spectral types for TWA peaks near M5 (~0.15M{sun}), resembling the distributions measured for other nearby young associations. The UVW velocities of its members indicate that the association is expanding. The rate of expansion corresponds to an age of 9.6_-0.8_^+0.9^Myr. In a Gaia color-magnitude diagram, the members of TWA exhibit well-defined sequences of single stars and unresolved binary stars. The combined sequence of low-mass stars in TWA is indicative of an age of 11.4_-1.2_^+1.3^Myr when compared to the sequence for Upper Centaurus Lupus/Lower Centaurus Crux, for which an age of 20Myr is assumed. Based on these expansion and isochronal ages, I have adopted an age of 10{+/-}2Myr for TWA. Finally, I have used mid-infrared photometry from the Wide-field Infrared Survey Explorer to check for excess emission from circumstellar disks among the TWA members. Fourteen members have detected disks, all of which have been reported in previous studies. The fraction of members at <~M6>~0.1M{sun}) that have full, transitional, or evolved disks is 10/52=0.19_-0.06_^+0.08^. That value is similar to the fraction previously measured for the Upper Sco association, which is roughly coeval with TWA.2023AJ....165..269Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/269CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/135 : Henry Draper Catalogue and Extension (Cannon+ 1918-1924; ADC 1989)II/328 : AllWISE Data Release (Cutri+ 2013)I/337 : Gaia DR1 (Gaia Collaboration, 2016)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)J/ApJS/99/135 : Rotation and Spectral Peculiarities (Abt+ 1995)J/ApJ/525/466 : Young low-mass stars & brown dwarfs in IC348 (Luhman+, 1999)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/ApJ/620/1010 : Spitzer 24{mu}m photometry of A dwarfs (Rieke+, 2005)J/AJ/132/866 : New M dwarfs in solar neighborhood (Riaz+, 2006)J/A+A/460/695 : Search Associations Containing Young stars (Torres+, 2006)J/ApJ/662/1067 : Sptizer observations of sigma Orionis (Hernandez+, 2007)J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/A+A/517/A76 : Near-IR spectrum of 2M1207b (Patience+, 2010)J/ApJ/758/31 : IR photometry for members of Upper Sco (Luhman+, 2012)J/A+A/551/A107 : Xshooter spectra of 24 young stellar objects (Manara+, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/A+A/562/A127 : NIR integral field spectra of 15 M-Ldwarfs (Bonnefoy+, 2014)J/A+A/568/A26 : SACY. V. Multiple systems (Elliott+, 2014)J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)J/ApJ/788/81 : BANYAN III. RVel & rotation of low-mass stars (Malo+, 2014)J/A+A/564/A55 : 1.1-2.4um spectra of 7 young M & Ldwarfs (Manjavacas+, 2014)J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/MNRAS/453/2220 : Early-type Sco-Cen memb with literature RVs (Murphy+, 2015)J/AJ/154/134 : Planetary-mass brown dwarfs in Taurus SFR (Esplin+, 2017)J/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)J/ApJ/840/87 : Young star systems observed with SALT (Riedel+, 2017)J/AJ/154/69 : ACRONYM II. {beta} Pictoris Moving Group (Shkolnik+, 2017)J/ApJS/234/1 : M, L, & T dwarfs from PS1 3{pi} Survey (Best+, 2018)J/MNRAS/478/4513 : GALAH Survey DR2 (Buder+, 2018)J/AJ/156/75 : Circumstellar disks in Upper Sco association (Esplin+, 2018)J/MNRAS/475/1960 : ESPaDOnS spectropolarimeter obs. of M dwarfs (Fouque+, 2018)J/ApJ/862/138 : BANYAN. XIII. Nearby young assoc. Gaia DR2 (Gagne+, 2018)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/ApJ/877/60 : YMGs. I. Young binaries & lithium-rich stars (Bowler+, 2019)J/MNRAS/489/3625 : Applying Chronostar {beta}Pictoris group (Crundall+, 2019)J/AJ/157/234 : ACRONYM. III. Cand young low-mass stars (Schneider+, 2019)J/A+A/632/A46 : TW Hydrae association with X-shooter (Venuti+, 2019)J/AJ/159/257 : Hawaii IR plx program IV. L0-T8 BDs with UKIRT (Best+, 2020)J/MNRAS/491/215 : Supplementary data for 146 cand young stars (Binks+, 2020)J/AJ/160/44 : Upper Scorpius spectroscopy and photometry (Luhman+, 2020)J/A+A/642/A179 : betaPictoris moving group RV of 81 stars (Miret-Roig+, 2020)J/A+A/649/A3 : Gaia EDR3 photometric passbands (Riello+, 2021)J/A+A/645/A30 : SB updated census in SACY sample (Zuniga-Fernandez+, 2021)J/AJ/163/24 : Stellar populations in the Sco-Cen complex (Luhman, 2022)J/AJ/163/25 : Circumstellar disk pops in Sco-Cen complex (Luhman, 2022)J/MNRAS/520/6245 : Dynamical age Tucana-Horologium (Galli+, 2023)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/269https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/269http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/269https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/269https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/269http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/269GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/269/table2 (Adopted Members of TWA)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/269/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/269/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/269/table2?GETtext/xml+votable180.050000true146.61544194-44.961308890.0055555555555555560/8.157980699529898e-21 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/269?format=asciiOpticalInfrareddefaultJ/AJ/165/269/table1New spectral classifications for candidate members of TWArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 source identifiermeta.id;meta.mainSpTNew spectral typesrc.spTypecharl_lambda[<] Limit on lambdameta.code.errorcharlambda[0.1/0.8]? Wavelength W{lambda}(Li) ({AA}) (1)0.1nmem.wlfloatnullableInstInstrument used (FEROS or GMOS)instr.setupcharObs[2013/2023] Year of observationtime.epochJ/AJ/165/269/table2Adopted Members of TWAwisesep[0/1.85]? Angular separation between Gaia DR3 (epoch 2010.5) and WISEarcsecpos.angDistancefloatnullablewisecloseIs this Gaia source the closest match for the WISE source?meta.codecharJmag[5.313/15.494]? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.018/0.058]? Error in Jmagmagstat.error;phot.magfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.raindexed_DE.icrsDeclination (ICRS) at Epoch=J2000, proper motions taken into accountdegpos.eq.decindexedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 source namemeta.id;meta.mainprimaryNameOther source namemeta.idcharRAICRS[146/210] Gaia DR3 right ascension (ICRS at Epoch 2016.0)degpos.eq.ra;meta.mainDEICRS[-53/-17] Gaia DR3 declination (ICRS at Epoch 2016.0)degpos.eq.dec;meta.mainSpTSpectral typesrc.spTypecharr_SpTSpectral type referencemeta.ref;pos.framecharAdoptAdopted spectral typesrc.spTypecharpmRA[-119/-38]? Gaia DR3 proper motion in right ascensionmas/yrpos.pm;pos.eq.radoublenullablee_pmRA[0.01/0.7]? Error in pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-42/10]? Gaia DR3 proper motion in declinationmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.01/0.7]? Error in pmDecmas/yrstat.error;pos.pm;pos.eq.decfloatnullableplx[9.5/29.4]? Gaia DR3 parallaxmaspos.parallax.trigfloatnullablee_plx[0.01/1]? Error in plxmasstat.error;pos.parallaxfloatnullablermedgeo[34/105]? Median of geometric distance posterior (1)pcpos.distancefloatnullablerlogeo[34/105]? 16th percentile of geometric distance posterior (1)pcpos.distancefloatnullablerhigeo[34/105]? 84th percentile of geometric distance posterior (1)pcpos.distancefloatnullableRVel[3.79/20]? Radial velocitykm/sspect.dopplerVelocfloatnullablee_RVel[0.01/7]? Error in RVelkm/sstat.error;spect.dopplerVelocfloatnullabler_RVel[1/18]? Radial velocity reference (2)meta.ref;pos.frameintnullableU[-14.8/-6.19]? U component of space velocitykm/sphys.veloc;pos.cartesian.xfloatnullablee_U[0.01/2.97]? Error in Ukm/sstat.error;pos.cartesian.xfloatnullableV[-28.4/-13.7]? V component of space velocitykm/sphys.veloc;pos.cartesian.yfloatnullablee_V[0.01/6.05]? Error in Vkm/sstat.error;pos.cartesian.yfloatnullableW[-11.3/-0.37]? W component of space velocitykm/sphys.veloc;pos.cartesian.zfloatnullablee_W[0.01/2.91]? Error in Wkm/sstat.error;pos.cartesian.zfloatnullableGmag[5.42/20.6] Gaia DR3 G magnitudemagphot.mag;em.opt.Vfloate_Gmag[0.003/0.07] Error in Gmagmagstat.error;phot.magfloatGBPmag[5.44/21.7]? Gaia DR3 GBP magnitudemagphot.mag;em.opt.Bfloatnullablee_GBPmag[0.003/0.3]? Error in GBPmagmagstat.error;phot.magfloatnullableGRPmag[5.35/19]? Gaia DR3 GRP magnitudemagphot.mag;em.opt.Rfloatnullablee_GRPmag[0.004/0.3]? Error in GRPmagmagstat.error;phot.magfloatnullableRUWE[0.87/10.5]? Gaia DR3 renormalized unit weight errorstat.errorfloatnullable2MClosest 2MASS source within 3 arcsecmeta.id.assocchar2Msep[0.01/2]? Angular separation between Gaia DR3 (epoch 2000) and 2MASSarcsecpos.angDistancefloatnullable2McloseIs this Gaia source the closest match for the 2MASS source?meta.codecharwiseClosest WISE source within 3 arcsecmeta.id.assoccharHmag[5.352/14.608]? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.022/0.067]? Error in Hmagmagstat.error;phot.magfloatnullableKsmag[5.235/14.04]? 2MASS Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.017/0.06]? Error in Ksmagmagstat.error;phot.magfloatnullableW1mag[5.212/13.64]? WISE W1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag[0.022/0.079]? Error in W1magmagstat.error;phot.magfloatnullableW2mag[4.996/13.204]? WISE W2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag[0.019/0.054]? Error in W2magmagstat.error;phot.magfloatnullablef_W2magFlag on W2mag (3)meta.codecharW3mag[3.11/11.785]? WISE W3 magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_W3mag[0.013/0.212]? Error in W3magmagstat.error;phot.magfloatnullablef_W3magFlag on W3mag (3)meta.codecharW4mag[0.202/8.853]? WISE W4 magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_W4mag[0.009/0.404]? Error in W4magmagstat.error;phot.magfloatnullablef_W4magFlag on W4mag (3)meta.codecharExcW2? Excess present in W2?meta.codecharExcW3? Excess present in W3?meta.codecharExcW4? Excess present in W4?meta.codecharDiskType? Disk Type (4)meta.codecharbfmemBona fide member of TWA (Gagne et al. 2017)meta.code.membercharoutlierSpatial outliermeta.crypticcharNewNew spectral classification (table1)meta.ref.urlcharJ/AJ/165/269/figure3Combined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 identifiermeta.id;meta.maincharlambdaWavelength ({AA})0.1nmem.wldoubleF7500Flux ratio (F{lambda}/F7500{AA})phot.flux;arith.ratiodoubleJ/AJ/165/269/refsReferences usedrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRef[1/51] Reference codemeta.noteintAuthorMain author (et al.)meta.bib.authorcharBIBBIBcodemeta.bib.bibcodecharCat.Catalog in VizieRmeta.notecharNoteAdditional notemeta.notechar