The Sound of Core Collapse Supernovae: The Spherical Accretion Shock Instability (SASI)

Details The Sound of Core Collapse Supernovae: The Spherical Accretion Shock Instability (SASI) The Sound of Core Collapse Supernovae: The Spherical Accretion Shock Instability (SASI)

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.1702b&link_type=abstract

American Astronomical Society Meeting 207, #17.02; Bulletin of the American Astronomical Society, Vol. 37, p.1181

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We use 2D numerical simulations to study the linear response of the stalled accretion shock during the first few hundred milliseconds after core bounce in core-collapse supernovae. We use these simulations to measure the growth rate and frequency of the Spherical Accretion Shock Instability, or SASI. These simulations demonstrate that the l=1 mode (in spherical harmonics) is the most unstable, with a characteristic growth time of order 50 msec. Further, these simulations provide evidence that the SASI is due to the growth of a normal acoustic mode trapped inside the accretion shock. The dynamical response of the shock to interior pressure perturbations leads to a rapid amplification of the trapped acoustic wave. The result is that core-collapse supernova may "ring" with a frequency of order 15 Hz, with rapid growth of the acoustic oscillations leading to nonlinear changes in the accretion shock within a few hundred milliseconds.
This work was performed under the auspices of the TeraScale Supernova Initiative, funded by SciDAC grants from the DOE Office of Science High-Energy, Nuclear, and Advanced Scientific Computing Research Programs.

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