J/ApJ/935/54ivo://CDS.VizieR/J/ApJ/935/54doi:10.26093/cds/vizier.19350054CDSRobinson C.E.Espaillat C.C.Rodriguez J.E.2024-11-12T20:10:50Z2024-06-24T08:56:10ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsstellar-massesinfrared-photometryvisible-astronomybroad-band-photometryInterpreting the short-timescale variability of the accreting, young, low-mass stars known as Classical T-Tauri stars remains an open task. Month-long, continuous light curves from the Transiting Exoplanet Survey Satellite (TESS) have become available for hundreds of T-Tauri stars. With this vast data set, identifying connections between the variability observed by TESS and short-timescale accretion variability is valuable for characterizing the accretion process. To this end, we obtained short-cadence TESS observations of 14 T-Tauri stars in the Taurus star formation region along with simultaneous ground-based, UBVRI-band photometry to be used as accretion diagnostics. In addition, we combine our data set with previously published simultaneous near- UV-near-IR Hubble Space Telescope spectra for one member of the sample. We find evidence that much of the short-timescale variability observed in the TESS light curves can be attributed to changes in the accretion rate, but note significant scatter between separate nights and objects. We identify hints of time lags within our data set that increase at shorter wavelengths, which we suggest may be evidence of longitudinal density stratification of the accretion column. Our results highlight that contemporaneous, multiwavelength observations remain critical for providing context for the observed variability of these stars.2022ApJ...935...54Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/935/54CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/ApJ/771/129 : Submillimetric Class II sources of Taurus (Andrews+, 2013)J/AJ/146/131 : UBVRI standard stars at +50{deg} declination (Landolt, 2013)J/AJ/147/82 : Monitoring of disk-bearing stars in NGC 2264 (Cody+, 2014)J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)J/A+A/581/A66 : UV variability and accretion in NGC 2264 (Venuti+, 2015)J/A+A/586/A47 : Accretion process in NGC 2264 (Sousa+, 2016)J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)J/ApJ/872/158 : Survey of Class II sources in Taurus with ALMA (Akeson+, 2019)J/AJ/157/144 : Protoplanetary disk masses in Taurus (Ballering+, 2019)J/A+A/628/A68 : SPHERE image of RY Tau (Garufi+, 2019)J/AJ/162/110 : Gaia EDR3 census of Taurus-Auriga complex (Krolikowski+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/935/54https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/935/54http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/935/54https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/935/54https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/935/54http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/935/54GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/935/54/table1 (The 4.3m Lowell Discovery Telescope (LDT) UBVRI photometry and M measurements for the entire sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/935/54/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/935/54/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/935/54/table1?GETtext/xml+votable180.050000true64.81597529.10747970.0055555555555555565/292 6/1083 1114 1123-1124 1136 1159https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/935/54?format=asciiOpticalInfrareddefaultJ/ApJ/935/54/table1The 4.3m Lowell Discovery Telescope (LDT) UBVRI photometry and M measurements for the entire sampleSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource identifiermeta.id;meta.maincharMBJD[58819/58839] Modified Barycentric Julian Date of 1st exposure start in UBVRI set (1)dtime.epochdoubleUmag[11/18.2]? Apparent U band Vega magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0/0.3]? Uncertainty in Umag see Section 2.2magstat.error;phot.magfloatnullableMBJD-U[58819/58839]? Modified Barycentric Julian Date of U band start (1)dtime.epochdoublenullableBmag[10.5/17] Apparent B band Vega magnitudemagphot.mag;em.opt.Bfloate_Bmag[0.009/0.07] Uncertainty in Bmag; see Section 2.2magstat.error;phot.magfloatMBJD-B[58819/58839] Modified Barycentric Julian Date of B band start (1)dtime.epochdoubleVmag[9.62/15.3] Apparent V band Vega magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.02/0.04] Uncertainty in Vmag; see Section 2.2magstat.error;phot.magfloatMBJD-V[58819/58839] Modified Barycentric Julian Date of V band start (1)dtime.epochdoubleRmag[8.92/13.7] Apparent R band Vega magnitudemagphot.mag;em.opt.Rfloate_Rmag[0.02/0.04] Uncertainty in Rmag; see Section 2.2magstat.error;phot.magfloatMBJD-R[58819/58839] Modified Barycentric Julian Date of R band start (1)dtime.epochdoubleImag[8.23/12.2] Apparent I band Vega magnitudemagphot.mag;em.opt.Ifloate_Imag[0.02/0.06] Uncertainty in Imag; see Section 2.2magstat.error;phot.magfloatMBJD-I[58819/58839] Modified Barycentric Julian Date of I band start (1)dtime.epochdoubleMdotF[0.07/15.4]? Mass accretion rate assuming fixed stellar parameters in Table 41e-08solMass.yr**-1arith.rate;phys.massfloatnullableMdotR[0.07/15.5]? 50th percentile of random uncertainty mass accretion rate distribution (2)1e-08solMass.yr**-1phys.massfloatnullableE_MdotR[0.02/3.0]? Upper uncertainty in MdotR; 84th - 50th percentile1e-08solMass.yr**-1stat.error;stat.maxfloatnullablee_MdotR[0.01/3.0]? Lower uncertainty in MdotR; 50th - 16th percentile1e-08solMass.yr**-1stat.errorfloatnullableMdotS[0.08/21.0]? 50th percentile of systematic uncertainty mass accretion rate distribution (3)1e-08solMass.yr**-1stat.error.sys;phys.massfloatnullableE_MdotS[0.08/7.0]? Upper uncertainty in MdotS; 84th - 50th percentile1e-08solMass.yr**-1stat.error;stat.maxfloatnullablee_MdotS[0.05/5.0]? Lower uncertainty in MdotS; 50th - 16th percentile1e-08solMass.yr**-1stat.errorfloatnullable_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/ApJ/935/54/table2LDT U-band monitoring & M measurements of GM Aure_MdotR[0.05/0.6] Lower uncertainty in MdotR; 50th - 16th percentile1e-08solMass.yr**-1stat.errorfloatMdotS[0.51/1.8] 50th percentile of systematic uncertainty mass accretion rate distribution (2)1e-08solMass.yr**-1stat.error.sys;phys.massfloatE_MdotS[0.3/2] Upper uncertainty in MdotS; 84th - 50th percentile1e-08solMass.yr**-1stat.error;stat.maxfloate_MdotS[0.2/0.7] Lower uncertainty in MdotS; 50th - 16th percentile1e-08solMass.yr**-1stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMBJD[58819/58839] Modified Barycentric Julian Date (1)dtime.epochdoubleUmag[12.9/14.1] Apparent U band Vega magnitudemagphot.mag;em.opt.Ufloate_Umag[0.08/2] Uncertainty in Umagmagstat.error;phot.magfloatMdotF[0.51/1.71] Mass accretion rate assuming fixed stellar parameters in Table 4 (2)1e-08solMass.yr**-1arith.rate;phys.massfloatMdotR[0.51/1.7] 50th percentile of random uncertainty mass accretion rate distribution (2)1e-08solMass.yr**-1phys.massfloatE_MdotR[0.06/2] Upper uncertainty in MdotR; 84th - 50th percentile1e-08solMass.yr**-1stat.error;stat.maxfloat