J/AJ/145/66ivo://CDS.VizieR/J/AJ/145/66doi:10.26093/cds/vizier.51450066CDSFlaherty K.M.Muzerolle J.Rieke G.Gutermuth R.Balog Z.Herbst W.,Megeath S.T.2018-01-05T08:55:57Z2014-04-04T14:07:54ZCDS support team

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

cds-question@unistra.fropen-star-clustersyoung-stellar-objectsinfrared-photometryline-intensitieseffective-temperatureWe report on synoptic observations at 3.6 and 4.5{mu}m of young stellar objects in IC 348 with 38epochs covering 40days. We find that among the detected cluster members, 338 at [3.6] and 269 at both [3.6] and [4.5], many are variable on daily to weekly timescales with typical fluctuations of ~0.1mag. The fraction of variables ranges from 20% for the diskless pre-main sequence stars to 60% for the stars still surrounded by infalling envelopes. We also find that stars in the exposed cluster core are less variable than the stars in the dense, slightly younger, southwestern ridge. This trend persists even after accounting for the underlying correlation with infrared spectral energy distribution type, suggesting that the change in variable fraction is not simply a reflection of the change in relative fraction of class I versus class II sources across the cloud, but instead reflects a change in variability with age. We also see a strong correlation between infrared variability and X-ray luminosity among the class II sources. The observed variability most likely reflects large changes in the structure of the inner wall located at the dust sublimation radius. We explore the possibility that these structural perturbations could be caused by a hot spot on the star heating dust above the sublimation temperature, causing it to evaporate rapidly, and increasing the inner radius for a portion of the disk. Under a number of simplifying assumptions we show that this model can reproduce the size and timescale of the 3.6 and 4.5{mu}m fluctuations. Regardless of its source, the infrared variability indicates that the inner disk is not a slowly evolving entity, but instead is a bubbling, warped, dented mass of gas and dust whose global size and shape fluctuate in a matter of days.2013AJ....145...66Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/66CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/197 : ISM towards IC 348 and Per OB2 (Cernis, 1993)J/other/Nat/493.378 : LRL 54361 Spitzer light curves (Muzerolle+, 2013)J/A+A/539/A64 : X-ray data for IC 348 young stars (Alexander+, 2012)J/ApJS/201/11 : Mid-IR spectral variability atlas of YSOs (Kospal+, 2012)J/A+A/537/A135 : X-ray view of IC348 (Stelzer+, 2012)J/ApJ/733/50 : Mid-IR photometric monitoring of the ONCJ/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/138/703 : Deep MIPS observations of IC 348 nebula (Currie+, 2009)J/AJ/134/411 : Properties of IC 348 members (Muench+, 2007)J/ApJ/649/862 : IR phot. of IC 348 pre-main-sequence stars (Cieza+, 2006)J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)J/ApJ/646/297 : Pre-main-sequence stars spitzer observations (Rebull+, 2006)J/MNRAS/358/341 : Ic photometry of IC 348 (Littlefair+, 2005)J/AJ/127/1602 : Cousins RI photometry in IC 348 (Cohen+, 2004)J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003)J/ApJ/597/555 : IR photometry of IC 348 young brown dwarfs (Mainzer+, 2003)J/A+A/409/147 : J magnitude of IC 348 brown dwarfs (Preibisch+, 2003)J/AJ/122/866 : X-ray sources in IC 348 from Chandra (Preibisch+, 2001)J/ApJ/541/977 : HST observations of low-mass stars in IC 348 (Najita+, 2000)J/ApJ/525/466 : Young low-mass stars & brown dwarfs in IC 348 (Luhman+, 1999)J/ApJ/497/736 : The young cluster IC 348. (Herbig, 1998)J/A+A/324/549 : Deep UVBRI photometry in IC 348 (Trullols+ 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/145/66https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/145/66http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/145/66https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/145/66https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/145/66http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/145/66GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/145/66/table1 (Cluster member properties)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/145/66/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/145/66/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/145/66/table1?GETtext/xml+votable180.050000true56.142532.16290.005555555555555556Cone search capability for table J/AJ/145/66/photometry ([3.6] photometry (table2) and [4.5] photometry (table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/145/66/photometry?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/145/66/photometry?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/145/66/photometry?GETtext/xml+votable180.050000true56.142532.16290.0055555555555555566/15393.9193497546148093e-20 6.185923063528282e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/145/66?format=asciiInfrareddefaultJ/AJ/145/66/table1Cluster member propertiesLCLight curvemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintf_LRLVariable? (y, n, y1, n1, p, or b) (7)meta.codecharLRL[1/57025] YSO identifier (G1)meta.id;meta.mainintprimarym_LRL[AB] Multiplicity flag on LRL (A or B)meta.code.multipcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainTeff? Effective temperatureKphys.temperature.effectiveintnullableLum? Stellar luminositysolLumphys.luminositydoublenullableW(Ha)? H{alpha} equivalent width; in {AA} (1)0.1nmspect.line.eqWidth;em.line.HalphafloatnullablePer? Optical period (2)dtime.periodfloatnullableAVThe V-band extinctionmagphys.absorption;em.opt.VfloatLX? X-ray luminosity; in 10^28^erg/s (3)ZWphys.luminosity;em.X-rayfloatnullableE3.6? Excess emission at 3.6{mu}mmagphot.flux;arith.ratiofloatnullablealpha? Slope of the observed infrared SED (4)spect.indexfloatnullablealpha2? Slope of the dereddened infrared SED (5)spect.indexfloatnullableDistDistance from HH 211 (6)arcminpos.angDistancefloatRefReference (8)meta.ref;pos.framecharL03Display the data from Luhman et al. (2003, cat. J/ApJ/593/1093) if anymeta.numberintnullableM07Display the data from Muench et al. (2007, cat. J/AJ/134/411) if anymeta.numberintnullableL06Display the data from Lada et al. (2006, cat. J/AJ/131/1574) if anymeta.numberintnullableC04Display the data from Cohen et al. (2004, cat. J/AJ/127/1602) if anymeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/145/66/photometry[3.6] photometry (table2) and [4.5] photometry (table3)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintLRL[1/57025] YSO identifier (G1)meta.id;meta.mainintprimarym_LRL[AB] Multiplicity flag on LRL (A or B)meta.code.multipcharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainMJD[55106.9/55142.1] Modified Julian Datedtime.epochfloat[3.6]? Spitzer/IRAC 3.6{mu}m band magnitudemagphot.mag;em.IR.3-4umdoublenullablee_[3.6]? Uncertainty in [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5{mu}m band magnitudemagphot.mag;em.IR.4-8umdoublenullablee_[4.5]? Uncertainty in [4.5]magstat.errorfloatnullable