J/AJ/145/59ivo://CDS.VizieR/J/AJ/145/59doi:10.26093/cds/vizier.51450059CDSHillenbrand L.A.Miller A.A.Covey K.R.Carpenter J.M.Cenko S.B.,Silverman J.M.Muirhead P.S.Fischer W.J.Crepp J.R.Bloom J.S.,Filippenko A.V.2017-06-20T13:17:06Z2014-03-31T13:18:20ZCDS support team

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

cds-question@unistra.frvariable-starsinfrared-photometryvisible-astronomyphotometryWe report extensive new photometry and spectroscopy of the highly variable young stellar object PTF 10nvg (also known as IRAS 20496+4354 and V2492 Cyg), including optical and near-infrared time-series data as well as mid-infrared and millimeter data. Following the previously reported 2010 rise to R_PTF_<~13.5^m^ and subsequent fade, during 2011 and 2012 the source underwent additional episodes of brightening, followed by several magnitude dimming events including prolonged faint states at R_PTF_>~20^m^. The observed high-amplitude variations are largely consistent with extinction changes ({Delta}A_V_ up to 30mag) having a ~220day quasi-periodic signal. However, photometry measured when the source was near maximum brightness in mid-2010 as well as in late-2012 does not phase well to this period. Spectral evolution includes not only changes in the spectral slope but also correlated variation in the prominence of TiO/VO/CO bands and atomic line emission, as well as anti-correlated variation in forbidden line emission which, along with H_2_, dominates optical and infrared spectra at faint epochs. Notably, night-to-night variations in several forbidden doublet strengths and ratios are observed. High-dispersion spectra were obtained in a variety of photometric states and reveal time-variable line profiles. Neutral and singly ionized atomic species are likely formed in an accretion flow and/or impact while the origin of zero-velocity atomic LiI{lambda}6707 in emission is unknown. Forbidden lines, including several rare species, exhibit blueshifted emission profiles and likely arise from an outflow/jet. Several of these lines are also seen spatially offset from the continuum source position, presumably in a shocked region of an extended jet. Blueshifted absorption components of the NaI D doublet, KI{lambda}{lambda}7665,7669 doublet, and the OI 7774 triplet, as well as blueshifted absorption components seen against the broad H{alpha} and CaII triplet emission lines, similarly are formed in the outflow. CARMA maps resolve on larger scales a spatially extended outflow in millimeter-wavelength CO. We attribute the recently observed photometric and spectroscopic behavior to rotating circumstellar disk material located at separation a~0.7(M_*_/M_{sun}_)^1/3^AU from the continuum source, causing the semi-periodic dimming. Occultation of the central star as well as the bright inner disk and the accretion/outflow zones renders shocked gas in the inner part of the jet amenable to observation at the faint epochs. We discuss PTF 10nvg as a source exhibiting both accretion-driven (perhaps analogous to V1647 Ori) and extinction-driven (perhaps analogous to UX Ori or GM Cep) high-amplitude variability phenomena.2013AJ....145...59Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/145/59CatalogResearchIsServedByTAP VizieR generic servicerelated-toB/iram : IRAM Observation Logs (IRAM 1991-2014)B/vsx : AAVSO International Variable Star Index VSX (Watson+, 2006-2014)B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)J/A+A/551/A62 : V2492 Cyg light variations (Kospal+, 2013)J/ApJS/193/25 : The NAN complex. II. MIPS observations (Rebull+, 2011)J/ApJ/733/50 : Mid-IR photometry of the ONC (Morales-Calderon+, 2011)J/ApJS/188/123 : The Bolocam Galactic Plane Survey. II. (Rosolowsky+, 2010)J/AJ/140/1214 : NIR spectroscopic survey of class I YSOs (Connelley+, 2010)J/MNRAS/406/2473 : Photometry of GRB 071025 (Perley+, 2010)J/ApJ/691/723 : BVIJHKs observations of GRB 080319B (Bloom+, 2009)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/145/59https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/145/59http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/145/59https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/145/59https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/145/59http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/145/59GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap8.650015785639275e-20 3.5010283109654867e-19OpticalInfrareddefaultJ/AJ/145/59/table1*P48 R-band photometry of PTF 10nvge_Rmag? Error in Rmagmagstat.error;phot.mag;em.opt.RfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of observationdtime.epochdoublel_Rmag[>] Lower limit flag on Rmagmeta.code.errorcharRmag[13.471/20.637] The R band magnitudemagphot.mag;em.opt.RfloatJ/AJ/145/59/table3*PAIRITEL JHK-band photometry of PTF 10nvgrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMJDModified Julian Date of observationdtime.epochdoubleJmag[10.896/18.121] 2MASS J band magnitudemagphot.mag;em.IR.Jfloate_JmagError in Jmagmagstat.error;phot.mag;em.IR.JfloatHmag[9.414/13.94] 2MASS H band magnitudemagphot.mag;em.IR.Hfloatf_Hmag[s] Photometric flag on Hmag (s) (1)meta.codechare_HmagError in Hmagmagstat.error;phot.mag;em.IR.HfloatKmag[8.029/10.98]? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablef_Kmag[sn] Photometric flag on Kmag (s or n) (1)meta.codechare_Kmag? Error in Kmagmagstat.error;phot.mag;em.IR.Kfloatnullable