The Instability of Standing Accretion Shocks

Details The Instability of Standing Accretion Shocks The Instability of Standing Accretion Shocks

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe...9b&link_type=abstract

Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 7, 2006, Kavli Institute for Theoretical Physics,

Physics

Scientific paper

The origin of asymmetry in core-collapse supernovae may arise in the firstfew hundred milliseconds after bounce when the nascent shockwave is susceptible to the spherical accretion shock instability. Weprovide quantitative measurement of the growth of both an axisymmetric mode(l=1) and a non-axisymmetric mode (m=1) in the linear regime, and arguethat this instability is a growing pressure wave driven by the dynamicresponse of the accretion shock. Recent 3D simulations haveshown that the non-axisymmetric mode of the SASI dominates the nonlinearevolution, and can impart a significant amount of angular momentum to theunderlying neutron star.

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