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Classical nova events in symbiotic stars, although rare, offer a uniqueopportunity to probe the interaction between ejecta and a dense environment instellar explosions. In this work, we use X-ray data obtained with Swift andSuzaku during the recent classical nova outburst in V407 Cyg to explore such aninteraction. We find evidence of both equilibrium and non-equilibriumionization plasmas at the time of peak X-ray brightness, indicating a strongasymmetry in the density of the emitting region. Comparing a simple model tothe data, we find that the X-ray evolution is broadly consistent with novaejecta driving a forward shock into the dense wind of the Mira companion. Wedetect a highly absorbed soft X-ray component in the spectrum during the first50 days of the outburst that is consistent with supersoft emission from thenuclear burning white dwarf. The high temperature and short turn off time ofthis emission component, in addition to the observed breaks in the optical andUV lightcurves, indicate that the white dwarf in the binary is extremelymassive. Finally, we explore the connections between the X-ray and GeVgamma-ray evolution, and propose that the gamma ray turn-off is due to thestalling of the forward shock as the ejecta reach the red giant surface.

X-ray Emission from an Asymmetric Blast Wave and a Massive White Dwarf in the Gamma-ray Emitting Nova V407 Cyg