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We report on the time variation of SiO maser emission from the symbioticstellar system V407 Cyg after the classical nova outburst on 2010 March 10.Although both the SiO $J=1$--0 $v=1$ and 2 lines at 43.122 and 42.821 GHz werefound previously in the envelope of a mira in the binary system, only weakemission of the $J=1$--0 $v=2$ line has continuously been detectable after thenova outburst. The line profile exhibited a dramatic change several weeks afterthe burst; the component on the higher-velocity side of the systemic velocitydisappeared two weeks after the burst, and a new persistent component appearedon the lower-velocity side later. These observations indicate that the SiOemitting regions are wiped out in a time scale of two weeks by the nova shock,but a part of the masing region is quickly replenished by cool molecular gasesexpelled by the mira pulsation.

SiO Maser Spectra of V407 Cyg after the 2010 March Nova Outburst