Physics
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..937..399f&link_type=abstract
SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP Conference Proceedings, Volume 937, pp. 399-403 (2007).
Physics
Supernovae, Thermodynamic Processes, Conduction, Convection, Equations Of State, Neutron Stars
Scientific paper
During the core-collapse of a massive star, the spherical accretion shock which stalls at about 150 km above the surface of the newly formed neutron star is hydrodynamically unstable. A perturbative approach has allowed us to disentangle the effects of neutrino-driven convection from those of the advective-acoustic instability. The large scale, l = 1 asymmetry appearing a few hundred millisecond after core bounce cannot be explained by negative-entropy gradients due to neutrino heating in the gain region. This asymmetry is a natural consequence of the advective-acoustic cycle, occurring between the shock and the region of deceleration associated with neutrino cooling above the neutrinosphere. A detailed stability analysis of the flow has proven the instability of the advective-acoustic cycle in the simplified set up studied numerically by Blondin & Mezzacappa (2006, 2007). Our analysis also suggests that the purely acoustic cycle is stable.
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