2007/01/09 by J. Martin Laming · 34 citations
Physics and Astronomy · #Accretion (finance) #Accretion disc #Advection #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #Instability #Neutrino Physics Research #Shock (circulatory) #Shock wave #Supernova #astro-ph
paper · pdf · doi:10.1086/512534
published in The Astrophysical Journal 659(2), 1449-1457 (IOP Publishing) · 23 pages, 3 figures, accepted by ApJ
arxiv created 2007/01/09 · openalex publication_date 2007/04/17 · arxiv updated 2011/02/11 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We explore an analytic model of the accretion shock in the postbounce phase of a core-collapse supernova explosion. We find growing oscillations of the shock in the l = 1 and 2 modes, in agreement with a variety of existing numerical simulations. For modest values of the ratio of the outer accretion shock to that of the inner boundary to the shocked flow, the instability appears to derive from the growth of trapped sound waves, whereas at higher values, postshock advection clearly plays a role. Thus, the model described here may relate to the different mechanisms of instability recently advocated by Blondin & Mezzacappa and by Foglizzo and collaborators.