Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21332102f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #321.02; Bulletin of the American Astronomical Society, Vol. 41, p.376
Astronomy and Astrophysics
Astronomy
Scientific paper
I discuss work on the stability of a spherical accretion shock with nuclear dissociation, in the context of core-collapse supernovae. When the core of a massive star collapses, a shock wave is sent out which stalls due to the energy loss by neutrino emission and the dissociation of heavy nuclei. In the absence of neutrino heating, this stalled shock is linearly unstable to nonspherical perturbations, undergoing what is called the Standing Accretion Shock Instability (SASI). The influence of nuclear dissociation on the linear growth and nonlinear saturation of the SASI has not yet been studied in a systematic way. I'll report results from two-dimensional time-dependent hydrodynamic simulations and a linear stability analysis, which show that the instability becomes significantly weaker as the dissociation energy is increased. This indicates that neutrino heating plays a crucial role in exciting large amplitude shock oscillations in more realistic supernova simulations.
Fernandez Rodrigo
Thompson Christopher
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