Neutrinos from type II supernovae - The first 100 milliseconds

Details Neutrinos from type II supernovae - The first 100 milliseconds Neutrinos from type II supernovae - The first 100 milliseconds

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..222m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 222-231. Research supported by the University of Vir

Physics

71

Neutrinos, Supernova 1987A, Electron Capture, Equations Of State, Gravitational Collapse, Particle Acceleration, Shock Wave Propagation, Stellar Luminosity

Scientific paper

The collapse of a 1.17 solar mass iron core is numerically followed through infall to 100 ms past core bounce, and the emergent neutrino spectra during each phase are highlighted. It is found that, even with fairly optimistic conditions for producing a strong, sustained core-bounce shock wave, the prompt shock stalls within 9 ms of core bounce at a radius of less than 250 km. It appears that a radical change in the character of the progenitor core or in our understanding of the relevant physics of stellar collapse is needed before the direct mechanism for type II supernovae can become viable. Expanding the number of neutrino types from one to six magnifies the debilitating effect of neutrino loss on shock propagation. At shock breakout, prompt bursts of all neutrino types are observed. The luminosities of the nonelectron types show a sudden turn-on in luminosity while that of the electron neutrinos steadily increases throughout infall as a result of accelerating electron capture.

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