The Progenitor Systems of Classical Novae in M31

Abstract

We present the first characterization of the statistical relationship between a large sample of novae in M31 and their progenitor stellar populations in the form of a delay time distribution. To this end, we leverage the spatially resolved stellar age distribution of the M31 disk derived from deep HST photometry by the Panchromatic Hubble Andromeda Treasury (PHAT) survey and a large catalog of novae in M31. Our delay time distribution has two statistically significant detections: one population of nova progenitors, ages between 2 and 3.2 Gyr, with an unnormalized rate of ($3.7_{-3.5}^{+6.8}\pm 2.1)\cdot 10^{-9}$ events / $M_{\odot }$, and another of ages between 7.9 Gyr and the age of the Universe with ($4.8_{-0.9}^{+1.0}\pm 0.2)\cdot 10^{-9}$ events / $M_{\odot }$ (uncertainties are statistical and systematic, respectively). Together with the upper limits we derive at other time bins, these detections are consistent with either a constant production efficiency or a higher production efficiency of novae at earlier delay times.

14 pages, 6 figures. Accepted to The Astrophysical Journal

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