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Following the pulsation spectrum of a white dwarf through the heating andcooling involved in a dwarf nova outburst cycle provides a unique view of thechanges to convective driving that take place on timescales of months versusmillenia for non-accreting white dwarfs. In 2019 January the dwarf nova V386Ser (one of a small number containing an accreting, pulsating white dwarf),underwent a large amplitude outburst. Hubble Space Telescope ultravioletspectra were obtained 7 and 13 months after outburst along with opticalground-based photometry during this interval and high-speed photometry at 5.5and 17 months after outburst. The resulting spectral and pulsational analysisshows a cooling of the white dwarf from 21,020 K to 18,750 K (with a gravitylog(g) = 8.1) between the two UV observations, along with the presence ofstrong pulsations evident in both UV and optical at a much shorter period afteroutburst than at quiescence. The pulsation periods consistently lengthenedduring the year following outburst, in agreement with pulsation theory.However, it remains to be seen if the behavior at longer times past outburstwill mimic the unusual non-monotonic cooling and long periods evident in thesimilar system GW Lib.

The Heating and Pulsations of V386 Serpentis after its 2019 Dwarf Nova Outburst