New NuSTAR observation and historical review indicate an initial strong shock near the red giant in RS Oph produces both gamma-ray particle acceleration and 0.2-30 keV thermal X-rays, with gamma-ray flux from Fermi inconsistent and implications for T CrB.
Hydrogen Burning on Accreting White Dwarfs: Stability, Recurrent Novae, and the Post-Novae Supersoft Source
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abstract
We examine the properties of white dwarfs (WDs) accreting hydrogen-rich matter in and near the stable burning regime of accretion rates as modeled by time-dependent calculations done with Modules for Experiments in Stellar Astrophysics (MESA). We report the stability boundary for WDs of masses between 0.51 solar masses and 1.34 solar masses as found via time-dependent calculations. We also examine recurrent novae that are accreting at rates close to, but below, the stable burning limit and report their recurrence times and ignition masses. Our dense grid in accretion rates finds the expected minimum possible recurrence times as a function of the WD mass. This enables inferences to be made about the minimum WD mass possible to reach a specific recurrence time. We compare our computational models of post-outburst novae to the stably burning WDs and explicitly calculate the duration and effective temperature (Teff) of the post-novae WD in the supersoft phase. We agree with the measured turnoff time - Teff relation in M31 by Henze and collaborators, infer WD masses in the 1.0-1.3 solar masses range, and predict ejection masses consistent with those observed. We close by commenting on the importance of the hot helium layer generated by stable or unstable hydrogen burning for the short- and long-term evolution of accreting white dwarfs.
years
2026 2representative citing papers
M31 hosts at least 20 recurrent novae with 79 total eruptions; half recur faster than the shortest Galactic example, while light-curve and spatial properties match the Milky Way population.
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The powerful shocks in RS Oph: NuSTAR X-ray data and a complete review
New NuSTAR observation and historical review indicate an initial strong shock near the red giant in RS Oph produces both gamma-ray particle acceleration and 0.2-30 keV thermal X-rays, with gamma-ray flux from Fermi inconsistent and implications for T CrB.
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The Recurrent Nova Population in M31
M31 hosts at least 20 recurrent novae with 79 total eruptions; half recur faster than the shortest Galactic example, while light-curve and spatial properties match the Milky Way population.