Neutrino-driven convection versus advection in core collapse supernovae

Details Neutrino-driven convection versus advection in core collapse supernovae Neutrino-driven convection versus advection in core collapse supernovae

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sf2a.conf..483f&link_type=abstract

SF2A-2005: Semaine de l'Astrophysique Francaise, meeting held in Strasbourg, France, June 27 - July 1, 2005, Edited by F. Casoli

Astronomy and Astrophysics

Astrophysics

2

Scientific paper

A toy model is analyzed in order to evaluate the linear stability of the gain region immediately behind a stalled accretion shock, after core bounce. This model demonstrates that a negative entropy gradient is not sufficient to warrant linear instability. The stability criterion is governed by the ratio χ of the advection time through the gain region divided by the local timescale of buoyancy. The gain region is linearly stable if χ< 3. For χ>3, perturbations are unstable in a limited range of horizontal wavelengths centered around twice the vertical size H of the gain region. The advective stabilization of long wavelength perturbations weakens the possible influence of convection alone on a global l=1 mode. Convection may however cooperate efficiently with a global vortical-acoustic cycle extending below the gain radius.

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