Type Ia Supernova Models and Progenitor Scenarios

Abstract

We review some recent developments in theoretical studies on the connection between the progenitor systems of Type Ia supernovae (SNe Ia) and the explosion mechanisms. (1) DD-subCh: In the merging of double C+O white dwarfs (DD scenario), if the carbon detonation is induced near the white dwarf (WD) surface in the early dynamical phase, it could result in the (effectively) sub-Chandrasekhar mass explosion. (2) DD-Ch: If no surface C-detonation is ignited, the WD could grow until the Chandrasekhar mass is reached, but the outcome depends on whether the quiescent carbon shell burning is ignited and burns C+O into O+Ne+Mg. (3) SD-subCh: In the single degenerate (SD) scenario, if the He shell-flashes grow strong to induce a He detonation, it leads to the sub-Chandra explosion. (4) SD-Ch: If the He-shell flashes are not strong enough, they still produce interesting amount of Si and S near the surface of C+O WD before the explosion. In the Chandra mass explosion, the central density is high enough to produce electron capture elements, e.g., stable Ni-58. Observations of the emission lines of Ni in the nebular spectra provides useful diagnostics of the sub-Chandra vs. Chandra issue. The recent observations of relatively low velocity carbon near the surface of SNe Ia provide also interesting constraint on the explosion models.

Published in the Proceedings of the IAU Symposium No. 281 "Binary Paths to Type Ia Supernova Explosions" held in Padova (July 4-8, 2011)

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Cited by in corpus (6)

• Single Degenerate Models for Type Ia Supernovae Progenitor's Evolution and Nucleosythesis Yields
• Strong chemical tagging with APOGEE: 21 candidate star clusters that have dissolved across the Milky Way disc
• Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis
• Nucleosynthesis Constraints on the Explosion Mechanism for Type Ia Supernovae
• A study of Si II and S II features in spectra of Type Ia supernova
• Accreting White Dwarfs: Effect of WD Composition on Helium Ignition During Slow Accretion