J/ApJ/847/31ivo://CDS.VizieR/J/ApJ/847/31doi:10.26093/cds/vizier.18470031CDSMulders G.D.Pascucci I.Manara C.F.Testi L.Herczeg G.J.Henning T.,Mohanty S.Lodato G.2018-08-24T07:28:23Z2018-06-28T13:37:42ZCDS support team

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

cds-question@unistra.fraccretionstellar-massesstellar-spectral-typesyoung-stellar-objectsmolecular-cloudsIn this paper, we investigate the relation between disk mass and mass accretion rate to constrain the mechanism of angular momentum transport in protoplanetary disks. We find a correlation between dust disk mass and mass accretion rate in Chamaeleon I with a slope that is close to linear, similar to the one recently identified in Lupus. We investigate the effect of stellar mass and find that the intrinsic scatter around the best-fit M_dust_-M_*_ and dM_acc_/dt-M_*_ relations is uncorrelated. We simulate synthetic observations of an ensemble of evolving disks using a Monte Carlo approach and find that disks with a constant {alpha} viscosity can fit the observed relations between dust mass, mass accretion rate, and stellar mass but overpredict the strength of the correlation between disk mass and mass accretion rate when using standard initial conditions. We find two possible solutions. In the first one, the observed scatter in M_dust_ and dM_acc_/dt is not primordial, but arises from additional physical processes or uncertainties in estimating the disk gas mass. Most likely grain growth and radial drift affect the observable dust mass, while variability on large timescales affects the mass accretion rates. In the second scenario, the observed scatter is primordial, but disks have not evolved substantially at the age of Lupus and Chamaeleon I owing to a low viscosity or a large initial disk radius. More accurate estimates of the disk mass and gas disk sizes in a large sample of protoplanetary disks, through either direct observations of the gas or spatially resolved multiwavelength observations of the dust with ALMA, are needed to discriminate between both scenarios or to constrain alternative angular momentum transport mechanisms such as MHD disk winds.2017ApJ...847...31Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/847/31CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/ApJ/710/597 : Accretion in disks in Cep OB2 (Sicilia-Aguilar+, 2010)J/ApJ/771/129 : Submillimetric Class II sources of Taurus (Andrews+, 2013)J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)J/A+A/561/A2 : 36 accreting YSOs emission lines (Alcala+, 2014)J/A+A/570/A82 : Mapping accretion variability in NGC 2264 (Venuti+, 2014)J/ApJ/814/130 : Planet occurrence rates calculated for KOIs (Mulders+, 2015)J/A+A/581/A66 : UV variability and accretion in NGC 2264 (Venuti+, 2015)J/ApJ/828/46 : ALMA survey of Lupus protoplanetary disks. I. (Ansdell+, 2016)J/ApJ/831/125 : ALMA 887um obs. of ChaI star-forming region (Pascucci+, 2016)J/A+A/592/A49 : TW Hya CO(2-1), CN(2-1) and CS(5-4) data cubes (Teague+, 2016)J/A+A/600/A20 : Lupus YSOs X-shooter spectroscopy (Alcala+, 2017)J/ApJ/841/116 : Herschel spectra of 11 very low mass stars (Hendler+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/847/31https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/847/31http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/847/31https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/847/31https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/847/31http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/847/31GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/847/31/table1 (Stellar and disk properties for Chamaeleon I and Lupus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/847/31/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/847/31/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/847/31/table1?GETtext/xml+votable180.050000true163.4156719-77.20942890.0055555555555555565/9239 6/36946 36949 37122 37128 37129 42595 42597 42598 42599 42605 42610 42611 42614 42615 42704 42705 42707 42713 42714 42727 42736 42737 42738https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/847/31?format=asciidefaultJ/ApJ/847/31/table1Stellar and disk properties for Chamaeleon I and LupusSimbadNameSimbad column added by the CDSmeta.idcharExcExclude? (1)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentifier, 2MASS J or other star namemeta.idcharSpTMK spectral typesrc.spTypecharTeff[0/5110]? Stellar effective temperatureKphys.temperature.effectiveintnullablelogL[-2.7/0.8]? log of stellar luminositylog(solLum)phys.luminosityfloatnullablelogR[-0.9/0.6]? log of stellar radiuslog(solRad)phys.size.radiusfloatnullablelogM[-1.6/0.3]? log of stellar masslog(solMass)phys.massfloatnullablee_logM[0.04/0.4]? Uncertainty in logMlog(solMass)stat.errorfloatnullablelogLacc[-5.3/0.7]? Log of accretion luminositylog(solLum)phys.luminosityfloatnullablelogMdust[-0.9/2.7]? Log of dust mass(5.97236x10+24kg)phys.massfloatnullablee_logMdust[0.0003/0.2]? Uncertainty in logMdust(5.97236x10+24kg)stat.errorfloatnullableDet[True /False] Source is detected in dust continuum emission (>3{sigma})meta.codecharlogMacc[-12.3/-6.6]? log of mass accretion ratelog(solMass.yr**-1)arith.rate;phys.massfloatnullablee_logMacc[0.2/0.5] Uncertainty in logMacclog(solMass.yr**-1)stat.errorfloatDet2[True /False] Accretion luminosity > expected chromospheric emissionmeta.codecharRegRegion: Chamaeleon I (ChaI) or Lupusmeta.id.parentcharOCatDisplay the X-shooter catalogs (Alcala+, 2014, J/A+A/561/A2 and 2017, J/A+A/600/A20) within 2"meta.ref.urlintnullableRCatDisplay the ALMA catalogs (Pascucci+, 2016, J/ApJ/831/125 and Ansdell+, 2016, J/ApJ/828/46) within 2"meta.ref.urlintnullable_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