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We report extensive new photometry and spectroscopy of the highly variableyoung stellar object PTF 10nvg including optical and near-infrared time seriesdata as well as mid-infrared and millimeter data. Following the previouslyreported 2010 rise, during 2011 and 2012 the source underwent additionalepisodes of brightening and dimming events including prolonged faint states.The observed high-amplitude variations are largely consistent with extinctionchanges having a 220 day quasi-periodic signal. Spectral evolution includes notonly changes in the spectral slope but correlated variation in the prominenceof TiO/VO/CO bands and atomic line emission, as well as anticorrelatedvariation in forbidden line emission which, along with H_2, dominates opticaland infrared spectra at faint epochs. Neutral and singly-ionized atomic speciesare likely formed in an accretion flow and/or impact while the origin ofzero-velocity atomic LiI 6707 in emission is unknown. Forbidden lines,including several rare species, exhibit blueshifted emission profiles andlikely arise from an outflow/jet. Several of these lines are also seenspatially offset from the continuum source position, presumably in a shockedregion of an extended jet. CARMA maps resolve on larger scales a spatiallyextended outflow in mm-wavelength CO. We attribute the observed photometric andspectroscopic behavior in terms of occultation of the central star as well asthe bright inner disk and the accretion/outflow zones that renders shocked gasin the inner part of the jet amenable to observation at the faint epochs. Wediscuss PTF 10nvg as a source exhibiting both accretion-driven (perhapsanalogous to V1647 Ori) and extinction-driven (perhaps analogous to UX Ori orGM Cep) high-amplitude variability phenomena.

Highly Variable Extinction and Accretion in the Jet-driving Class I Type Young Star PTF 10nvg (V2492 Cyg, IRAS 20496+4354)