2003/08/29 by T. Foglizzo, Thierry Foglizzo, Foglizzo, Thierry +3
Physics and Astronomy · #Astro and Planetary Science #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0308534
6 pages, no figure, proceedings of the workshop "3-D signatures in stellar explosions", June 10-13 2003, Austin, Texas, USA
arxiv created 2003/08/29 · openalex publication_date 2003/08/29 · arxiv updated 2009/12/01 · openalex created_date 2022/10/03 · openalex updated_date 2026/07/28
The linear stability of stalled accretion shocks is investigated in the\ncontext of core collapse of type II supernovae. We focus on a particular\ninstability mechanism based on the coupling of acoustic perturbations with\nadvected ones (vorticity, entropy). This advective-acoustic cycle takes place\nbetween the shock and the nascent neutron star. Both adiabatic and\nnon-adiabatic processes may contribute to this coupling, but only adiabatic\nones are considered in this first approach. The growth time of the adiabatic\ninstability scales like the advection time, and is dominated by low degree\nmodes l=0,1,2. Non radial modes (l=1,2) found unstable by Blondin et al. (2003)\ncan be related to this mechanism.\n