Physics
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sscr.conf...13b&link_type=abstract
In: Supernovae: A survey of current research; Proceedings of the Advanced Study Institute, Cambridge, England, June 29-July 10,
Physics
7
Gravitational Collapse, Shock Wave Propagation, Stellar Evolution, Stellar Mass, Supernovae, Electron Capture, Entropy, Equations Of State, Neutrinos, Trapped Particles
Scientific paper
The basic physics of collapse of a massive star into a type II supernova, and the subsequent formation of a shock, is analyzed. The presupernova conditions are discussed, evaluating the initial entropy. The electron capture rate and neutronization of matter is analyzed, and neutrino trapping is addressed. A collapse scenario is obtained in which the adiabatic index is slightly less than 4/3 over the entire region of densities up to nuclear matter density, and then is substantially larger, about 2.5 up to the bounce. During the bounce, a shock wave is formed slightly outside the homologous core, which retains its low entropy. The shocked matter beyond the core has high entropy of about 5-10, and the nuclei are split up into nucleons. The equation of state of the shocked matter is simple, essentially that of a gas of nucleons with adiabatic index equal to 5/3. The dynamics of the collapse, the equation of state, the start of the shock, its initial energy, and its propagation are discussed in detail.
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