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We present multi-frequency radio observations of the 2010 nova event in thesymbiotic binary V407 Cygni, obtained with the Karl G. Jansky Very Large Arrayand spanning 1-45 GHz and 17-770 days following discovery. This nova---thefirst ever detected in gamma rays---shows a radio light curve dominated by thewind of the Mira giant companion, rather than the nova ejecta themselves. Theradio luminosity grew as the wind became increasingly ionized by the novaoutburst, and faded as the wind was violently heated from within by the novashock. This study marks the first time that this physical mechanism has beenshown to dominate the radio light curve of an astrophysical transient. We donot observe a thermal signature from the nova ejecta or synchrotron emissionfrom the shock, due to the fact that these components were hidden behind theabsorbing screen of the Mira wind.  We estimate a mass loss rate for the Mira wind of Mdot_w ~ 10^-6 M_sun/yr. Wealso present the only radio detection of V407 Cyg before the 2010 nova, gleanedfrom unpublished 1993 archival VLA data, which shows that the radio luminosityof the Mira wind varies by a factor of >~20 even in quiescence. Although V407Cyg likely hosts a massive accreting white dwarf, making it a candidateprogenitor system for a Type Ia supernova, the dense and radially continuouscircumbinary material surrounding V407 Cyg is inconsistent with observationalconstraints on the environments of most Type Ia supernovae.

astrophysical journal/the astrophysical journal

The Radio Light Curve of the Gamma-Ray Nova in V407 Cyg: Thermal  Emission from the Ionized Symbiotic Envelope, Devoured from Within by the  Nova Blast