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The C flash and the ignition conditions of Type Ia supernovae |
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| Authors: | P Lesaffre Z Han C A Tout Ph Podsiadlowski R G Martin |
| Institution: | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;Department of Astrophysics, University of Oxford, Oxford OX1 3RH;National Astronomical Observatories/Yunnan Observatory, the Chinese Academy of Science, PO Box 110, Kunming 650011, PR China;Centre for Stellar and Planetary Astrophysics, School of Mathematics, Monash University, Clayton, Victoria 3800, Australia |
| Abstract: | Thanks to a stellar evolution code that is able to compute through the C flash we link the binary population synthesis of single degenerate progenitors of Type Ia supernovae (SNe Ia) to their physical condition at the time of ignition. We show that there is a large range of possible ignition densities and we detail how their probability distribution depends on the accretion properties. The low-density peak of this distribution qualitatively reminds of the clustering of the luminosities of Branch-normal SNe Ia. We tighten the possible range of initial physical conditions for explosion models: they form a one-parameter family, independent of the metallicity. We discuss how these results may be modified if we were to relax our hypothesis of a permanent Hachisu wind or if we were to include electron captures. |
| Keywords: | supernovae: Type Ia white dwarfs |