J/MNRAS/519/3958ivo://CDS.VizieR/J/MNRAS/519/3958doi:10.26093/cds/vizier.75193958CDSIglesias D.P.Panic O.van den Ancker M.Petr-Gotzens M.G.Siess L.,Vioque M.Pascucci I.Oudmaijer R.Miley J.2024-08-22T20:16:46Z2023-04-27T09:30:17ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsearly-type-starsphotometryvisible-astronomyinfrared-photometrystellar-distanceradial-velocityIntermediate-mass stars (IMSs) represent the link between low-mass and high-mass stars, and cover a key mass range for giant planet formation. In this paper, we present a spectroscopic survey of 241 young IMS candidates with IR-excess, the most complete unbiased sample to date within 300 pc. We combined VLT/X-Shooter spectra with BVR photometric observations and Gaia DR3 distances to estimate fundamental stellar parameters such as Teff, mass, radius, age, and luminosity. We further selected those stars within the intermediate-mass range 1.5-3.5 solar masses, and discarded old contaminants. We used 2MASS and WISE photometry to study the IR-excesses of the sample, finding 92 previously unidentified stars with IR-excess. We classified this sample into "protoplanetary", "hybrid candidates", and "debris" discs based on their observed fractional excess at 12 microns, finding a new population of 17 hybrid disc candidates. We studied inner disc dispersal time-scales for wavelengths under 10 microns and found very different trends for IMSs and low-mass stars (LMSs). IMSs show excesses dropping fast during the first 6Myr independently of the wavelength, while LMSs show consistently lower fractions of excess at the shortest wavelengths, and increasingly higher fractions for longer wavelengths with slower dispersal rates. In conclusion, this study demonstrates empirically that IMSs dissipate their inner discs very differently than LMSs, providing a possible explanation for the lack of short period planets around IMSs.2023MNRAS.519.3958Ihttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/519/3958CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/519/3958https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/519/3958http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/519/3958https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/519/3958https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/519/3958http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/519/3958GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/519/3958/table1 (Objects, coordinates and description of the X-Shooter observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/519/3958/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/519/3958/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/519/3958/table1?GETtext/xml+votable180.050000true13.118125-69.50288890.0055555555555555566/295 474 496 728 1125 5204 8393 9250 9354 10294 12445 12968 12991 14346 14355 14417 18388 18605 18910 18996 19118 20651 20924 20952 21083 21143 21253 21482 21506 21643 21847 22017 22036 22205 22269 22992 23007 23224 23298 23451 23549 23631 23664 23816 24141 24230 24274 24302-24303 24326 24472 24484 26647 26672 28675 28681 28704 28811 28822 28863-28864 28872 28874 28890 28894 28897 28905 28921 28943 28962 28967 29091 29139 29174 29193 29207 29211 29238 29358 29437 29669 30219 30256 30266 30297 30321 30328 30412 30417 30422-30423 30429 30457 30478 30594 30630 30658 30691 30701 30707 30716 30868 31232 31739 31761 31972 32014 32065 32110 32146 32983 33338 33902 34011 34046 34096 36400 36773 36837 37021 37063 37120 37142 37177 37186 37231 37344 37366 37369 37372 37410 37592 37665 37818 37839 37883 37890 37893 37901 37926 38412 39195 39354-39355 39567-39568 39632 39784 40619 41181 41277 41478 41485 41513 41598 41632 41641 41643 41652 41678 41681-41682 41684 41749 41792 41803 41815 41820 41867 41939 41943 42117 42159 42206 42214-42215 42302 42315 42319 42358 42383 42401-42402 42424 42445 42456 42458 42461 42463 42496 42504 42589 42595 42618 42655 42684 42714 42746 42757 42819 42842 42847-42848 42911 42955 43017 43246 43255 43279 43358 43531 43540 43677 44220 44238 44248 44317 44319 44321 44371 45285 45486 45585 45708 45725 45869 46159 47362 47717 47821 48021 48717 489018.650015785639275e-20 5.101838343667421e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/519/3958?format=asciiOpticalInfrareddefaultJ/MNRAS/519/3958/table1Objects, coordinates and description of the X-Shooter observationsSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier used across this workmeta.id;meta.maincharSimbadIDIdentifier used in Simbadmeta.idcharRAJ2000Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNobsNumber of observationsmeta.numberintObs.dateObservation date (first and last for the case of multiple observations)time.epoch;obscharSNR-UVBSignal to noise ratio in the UVBstat.snrintSNR-VISSignal to noise ratio in the VISstat.snrintSNR-NIRSignal to noise ratio in the NIRstat.snrintJ/MNRAS/519/3958/table2Objects, spectral types, magnitudes and distances from the literatureW4magW4 magnitude from allWISE cataloguemagphot.flux.density;em.IR.15-30umfloate_W4magError in W4magmagstat.error;phot.magfloatDistPhotogeometric distance from Gaia DR3 (rpgeo)pcpos.distancefloatE_DistUpper uncertainty for Distancepcstat.error;stat.maxfloate_DistLower uncertainty for Distancepcstat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier used across this workmeta.id;meta.maincharFlag[*] * if it has been previously studied in the literaturemeta.code.errorcharSpTypeSpectral type from Tycho-2 cataloguesrc.spTypecharBTmagB magnitude from Tycho-2 cataloguemagphot.mag;em.opt.BfloatVTmagV magnitude from Tycho-2 cataloguemagphot.mag;em.opt.VfloatRmag? R magnitude from USNO-B cataloguemagphot.mag;em.opt.RfloatnullableKsmagKs magnitude from 2MASS cataloguemagphot.mag;em.IR.Kfloate_KsmagError in Ksmagmagstat.error;phot.magfloatW1magW1 magnitude from allWISE cataloguemagphot.mag;em.IR.3-4umfloate_W1magError in W1magmagstat.error;phot.magfloatl_W2magUpper limit flag on W2magmeta.code.errorcharW2magW2 magnitude from allWISE cataloguemagphot.mag;em.IR.4-8umfloate_W2mag? Error in W2magmagstat.error;phot.magfloatnullableW3magW3 magnitude from allWISE cataloguemagphot.flux.density;em.IR.8-15umfloate_W3magError in W3magmagstat.error;phot.magfloatJ/MNRAS/519/3958/table3Stellar parameters obtained for the whole samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier used across this workmeta.id;meta.maincharRVMean radial velocitykm/sphys.veloc;pos.heliocentricinte_RVMean error in radial velocitykm/sstat.errorintvsiniProjected rotational velocitykm/sphys.veloc.rotatintTeffEffective TemperatureKphys.temperature.effectiveinte_TeffUncertainty in effective TemperatureKstat.error;phys.temperature.effectiveintloggLogarithm of surface gravitylog(cm.s**-2)phys.gravityfloate_loggUncertainty in logglog(cm.s**-2)stat.errorfloatAvVisual extinctionmagphys.absorptionfloatDRDistance over radius ratiopc/solRadpos.distance;arith.ratiofloatE_DRUpper uncertainty in DRpc/solRadstat.error;stat.maxfloate_DRLower uncertainty in DRpc/solRadstat.errorfloatRStellar radius in solar radiisolRadphys.size.radiusfloate_RLower uncertainty in RsolRadstat.errorfloatLStellar Luminosity in solar luminositiessolLumphys.luminosityfloatE_LUpper uncertainty in LsolLumstat.error;stat.maxfloate_LLower uncertainty in LsolLumstat.errorfloatMpreMSStellar mass estimated from pre-main-sequence evolutionary tracks (in solar masses)solMassphys.massfloatE_MpreMSUpper uncertainty in M_preMSsolMassstat.error;stat.maxfloate_MpreMSLower uncertainty in M_preMSsolMassstat.errorfloatAgepreMSAge estimated from pre-main-sequence evolutionary tracks (in million years)Myrtime.agefloatE_AgepreMSUpper uncertainty in Age_preMSMyrstat.error;stat.maxfloate_AgepreMSLower uncertainty in Age_preMSMyrstat.errorfloatMpostMSStellar mass estimated from post-main-sequence evolutionary tracks (in solar masses)solMassphys.massfloatE_MpostMSUpper uncertainty in M_postMSsolMassstat.error;stat.maxfloate_MpostMSLower uncertainty in M_postMSsolMassstat.errorfloatAgepostMSAge estimated from post-main-sequence evolutionary tracks (in million years)Myrtime.agefloatE_AgepostMSUpper uncertainty in Age_postMSMyrstat.error;stat.maxfloate_AgepostMSLower uncertainty in Age_postMSMyrstat.errorfloatFlag[pre post] Most likely mass and age values (pre or post main-sequence)meta.code.errorcharE_AvUpper uncertainty in Avmagstat.error;stat.maxfloate_AvLower uncertainty in Avmagstat.errorfloatE_RUpper uncertainty in RsolRadstat.error;stat.maxfloatJ/MNRAS/519/3958/table6aFractional excesses and disc classification based on f12um for the refined selection of young IMSf12umFractional excess at 12 micronsphot.flux;arith.ratiofloatE_f12umUpper uncertainty in f12umstat.error;stat.maxfloate_f12umLower uncertainty in f12umstat.errorfloatf22umFractional excess at 22 micronsphot.flux;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintE_f3.4umUpper uncertainty in f3.4umstat.error;stat.maxfloate_f3.4umLower uncertainty in f3.4umstat.errorfloatf4.6umFractional excess at 4.6 micronsphot.flux;arith.ratiofloatE_f4.6umUpper uncertainty in f4.6umstat.error;stat.maxfloate_f4.6umLower uncertainty in f4.6umstat.errorfloatE_f22umUpper uncertainty in f22umstat.error;stat.maxfloate_f22umLower uncertainty in f22umstat.errorfloatDiscClassDisc classification based on f12ummeta.code.classcharNameIdentifier used across this workmeta.id;meta.maincharf2.2umFractional excess at 2.2 micronsphot.flux;arith.ratiofloatE_f2.2umUpper uncertainty in f2.2umstat.error;stat.maxfloate_f2.2umLower uncertainty in f2.2umstat.errorfloatf3.4umFractional excess at 3.4 micronsphot.flux;arith.ratiofloatJ/MNRAS/519/3958/table6bFractional excesses and disc classification based on f12um for the rest of the samplef12umFractional excess at 12 micronsphot.flux;arith.ratiofloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameIdentifier used across this workmeta.id;meta.maincharf2.2umFractional excess at 2.2 micronsphot.flux;arith.ratiofloatE_f2.2umUpper uncertainty in f2.2umstat.error;stat.maxfloate_f2.2umLower uncertainty in f2.2umstat.errorfloatf3.4umFractional excess at 3.4 micronsphot.flux;arith.ratiofloatE_f3.4umUpper uncertainty in f3.4umstat.error;stat.maxfloate_f3.4umLower uncertainty in f3.4umstat.errorfloatf4.6umFractional excess at 4.6 micronsphot.flux;arith.ratiofloatE_f4.6umUpper uncertainty in f4.6umstat.error;stat.maxfloate_f4.6umLower uncertainty in f4.6umstat.errorfloatE_f12umUpper uncertainty in f12umstat.error;stat.maxfloate_f12umLower uncertainty in f12umstat.errorfloatf22umFractional excess at 22 micronsphot.flux;arith.ratiofloatE_f22umUpper uncertainty in f22umstat.error;stat.maxfloate_f22umLower uncertainty in f22umstat.errorfloatDiscClassDisc classification based on f12ummeta.code.classchar