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Abstract: The mode of explosive burning in Type Ia SNe remains an outstanding problem.It is generally thought to begin as a subsonic deflagration, but this maytransition into a supersonic detonation the DDT. We argue that thistransition leads to a breakout shock, which would provide the first unambiguousevidence that DDTs occur. Its main features are a hard X-ray flash ~20 keVlasting ~0.01 s with a total radiated energy of ~10^{40} ergs, followed by acooling tail. This creates a distinct feature in the visual light curve, whichis separate from the nickel decay. This cooling tail has a maximum absolutevisual magnitude of M V = -9 to -10 at approximately 1 day, which depends mostsensitively on the white dwarf radius at the time of the DDT. As the thermaldiffusion wave moves in, the composition of these surface layers may beimprinted as spectral features, which would help to discern between SN Iaprogenitor models. Since this feature should accompany every SNe Ia, futuredeep surveys e.g., m=24 will see it out to a distance of approximately 80Mpc, giving a maximum rate of ~60-yr. Archival data sets can also be used tostudy the early rise dictated by the shock heating at about 20 days beforemaximum B-band light. A similar and slightly brighter event may also accompanycore bounce during the accretion induced collapse to a neutron star, but with alower occurrence rate.

Author: Anthony L. Piro 1, Philip Chang 1, 2, Nevin N. Weinberg 1 1 UC Berkeley, 2 CITA


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