J/AJ/159/135ivo://CDS.VizieR/J/AJ/159/135doi:10.26093/cds/vizier.51590135CDSGarcia Soto A.Ali A.Newmark A.Herbst W.Windemuth D.Winn J.N.2020-09-01T07:15:11Z2020-05-20T09:13:04ZCDS support team

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

cds-question@unistra.frvariable-starspre-main-sequence-starsmultiple-starsinfrared-photometryvisible-astronomyphotometryThe binary T Tauri star V582Mon (KH15D) is surrounded by a tilted and nodally precessing ring of dusty material, which has caused periodic occultations of one or both stars over the last 50 years. Here, we present multi-color time-series photometry (VRIJHK) throughout the 2017/2018 observing season, when the ring was covering the entire orbit of star A and gradually exposing the orbit of star B. We calculate the mean apparent magnitude of star B to be I=14.08. Besides the periodic eclipses of star B due to its orbital motion, we observed unexpected dips in brightness indicative of partially transparent stellar-sized clumps within the ring. The wavelength dependence of these events is suggestive of extinction by dust grains significantly larger than typical interstellar dust grains. The photometric variability observed while star B is being uncovered by the trailing edge of the ring is not simply the time reversal of the behavior seen when star A was being covered by the leading edge. Whereas the leading edge appeared to be very sharply defined, the trailing edge is "clumpy" and "fuzzy" (transparent), with a more gradual transition in opacity. The clumpiness and transparency of the occulting material provide a unique opportunity to study the properties of dust grains in a likely planet-forming zone.2020AJ....159..135Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/135CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/gcvs : General Catalogue of Variable Stars (Samus+, 2017)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/A+A/363/1081 : Non-linear limb-darkening law for LTE models (Claret 2000)J/AJ/140/2025 : KH 15D (V582 Mon) VI light curves (Herbst+, 2010)J/A+A/548/A97 : Catalogue of variable stars in open clusters (Zejda+, 2012)J/ApJ/773/54 : Var. stars in and around NGC 2264 with BEST (Klagyivik+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/AJ/147/9 : VRIJHK light curves of V582 Mon (Windemuth+, 2014)J/A+A/581/A52 : Gaia-ESO Survey: H{alpha} em. stars catalogue (Traven+, 2015)J/AJ/151/90 : Spitzer and VRIJHK photometry of V582 Mon (Arulanantham+,2016)J/A+A/599/A23 : Accretion-rotation connection in NGC 2264 (Venuti+, 2017)J/AJ/155/47 : VRIJHK photometry of the T Tauri binary KH 15D (Aronow+, 2018)J/A+A/630/A119 : Gaia DR2 distances to two clusters (Maiz, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/135https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/135http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/135https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/135https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/135http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/135GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/159/135/table1VRIJHK photometry of V582 MonObsObservatory code (1)meta.code;instr.obstycharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJD[2450017/2458211] Julian date of observationdtime.epochdoubleVmag[15.34/21.74]? The V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0/1.7]? The one sigma error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableRmag[14.62/19.4]? The R band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag[0.003/0.3]? The one sigma error in Rmagmagstat.error;phot.mag;em.opt.RfloatnullableImag[14/19.8]? The I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag[0.001/1.1]? The one sigma error in Imagmagstat.error;phot.mag;em.opt.IfloatnullableJmag[13.16/18.33]? The J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0/0.4]? The one sigma error in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[12.43/20]? The H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0/0.3]? The one sigma error in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag[12.16/19.53]? The K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag[0.01/2.8]? The one sigma error in Kmagmagstat.error;phot.mag;em.IR.KfloatnullableRefReference code (2)meta.notechar