Statistics – Computation
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110702b&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #107.02; Bulletin of the American Astronomical Society, Vol. 24, p.1292
Statistics
Computation
Scientific paper
We present the results of 2D numerical simulations of the early phase (t <= 1s) of a supernova explosion. The explosion is powered by neutrino absorption on free nucleons and neutrino scattering by electrons. We also include energy losses through neutrino emission following electron or positron capture by protons and neutrons as well as plasma neutrino emission processes. We show that neutrino heating results in a strongly convective region close to the neutron star. Hot material quickly rises whereas cold material is sinking towards the proto-neutron star. By removing the hot material from the vicinity of the neutron star, this large scale convection prevents overheating and hence limits energy losses through neutrino emission. In addition, the rising bubbles drive a strong shock outwards which eventually will lead to a successful explosion. The convective pattern is found to choose the largest mode possible in the computational domain. It follows that convective motions do not average out resulting in a net asymmetry of the explosion. If this asymmetry is confirmed by three-dimensional simulations, it could easily explain the observed high velocity dispersion of pulsars.
Benz Willy
Colgate Sterling A.
Herant Marc
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