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We survey our understanding of classical novae—nonterminal, thermonuclear eruptions on the surfaces of white dwarfs in binary systems. The recent and unexpected discovery of GeV gamma rays from Galactic novae has highlighted the complexity of novae and their value as laboratories for studying shocks and particle acceleration. We review half a century of nova literature through this new lens, and conclude the following:
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Download the Supplemental Material (PDF). Includes Supplemental Tables 1-2, Supplemental Figure 1, and Supplemental Videos 1-2 (also below).
Supplemental Video 1: Radiative shock fronts have corrugated and clumpy structure, due to thermal and thin-shell instabilities. This animation shows the complex density structure of the dual shocks created by a head-on collision of two flows (from the left and right, entering with 500 km/s corresponding to a Mach number M = 36 for the adopted temperature floor of 104 K). The colorscale tracks the log of density in units of g/cm3. This animation is from the simulations of Steinberg & Metzger (2018).
Supplemental Video 2: As in Supplemental Video 1, but here the colorscale tracks the log of temperature rather than density. This animation is from the simulations of Steinberg & Metzger (2018).