FRONTIERS IN COMPUTATIONAL ASTROPHYSICS

Particle and Flames in Radiative and Magnetic Flows

October 11-15, 2010
Lyon, France

Contribution of Inma Dominguez

Title

Multi-dimensional instability, propagation, and decay of carbon-oxygen detonations with complete and partial energy release in Type Ia supernovae

Topics

"Explosive fate of stars"

Keywords

hydrodynamic, instabilities, nucleosynthesis, numerical, shocks, supernova

Abstract

Detonations may be involved in Type Ia supernovae explosions, releasing energy and producing chemical species. At densities lower than 3e7 g/cc characteristic time-scales of burning (i.e. carbon-burning, oxygen-burning, silicon-burning) become comparable or longer than the global hydrodynamical time-scale of the explosion. In these conditions nuclear statistical equilibrium (NSE) is not reached and the intermediate mass elements, observed in SNIa spectra, are produced. In this work we investigate one- and multi-dimensional stability and propagation of carbon-oxygen detonations with both partial and NSE energy release in a range of background densities and overdrive conditions. Depending on circumstances, a detonation wave may be stable, oscillating, or rapidly decaying. This behaviour may have important implications for the development of a hierarchical cellular structure, propagation of detonation waves through supernova matter with density gradients, and supernova nucleosynthesis.