Gravitational and neutrino radiation from stellar core collapse: improved ellipsoidal model calculations.
Abstract
Gravitational, neutrino, and antineutrino radiation from stellar core collapse is analyzed by following the gravitational (Newtonian) collapse of rotating, 1.4 M0 homogeneous ellipsoids initially in hydrostatic equilibrium at a density of 4 x 10 g cm 3. The core is assumed to consist of neutrons, protons, and electrons in flequilibrium with electron neutrinos and antineutrinos. The model is characterized by a temperaturedepende,,nt "hard core" nuclear equation of state, neutrino and antineutrino transport via a "onezone model atmosphere approximation, and a "reflection shock" algorithm which describes the initial rebound of the "inner" core following maximum compression. In the nonrotating, spherical limit the collapse is nearly adiabatic and the computed core parameters, the maximum neutrino luminosities, and the total radiated efficiencies are in reasonable agreement with the results of recent inhomogeneous, spherical hydrodynamical calculations by Arnett and by Wilson. Nonspherical gravitational collapse is analyzed, and the efficiencies of gravitational and neutrino radiation are computed as functions of the core angular momentum, J. Nonaxisymmetric deformations are also considered. It is found that for a wide range of angular momenta satisfying 5 x J 3 x 10 ergs, eccentricities, gravitational radiation luminosities, and peak wave amplitudes increase dramatically after a few bounces the "inner" core undergoes largeamplitude, homologous oscillations following the initial infall. Efficiencies can reach AE /Mc2 10 10 2 after a few oscillations in some cases. The implications of these results for stellar collapse occurring in nature are explored. Subject headings: dense matter  gravitation  neutrinos  stars: collapsed  stars: interiors
 Publication:

The Astrophysical Journal
 Pub Date:
 May 1979
 DOI:
 10.1086/157046
 Bibcode:
 1979ApJ...229.1107S
 Keywords:

 Antineutrinos;
 Gravitational Collapse;
 Gravitational Waves;
 Neutrinos;
 Stellar Gravitation;
 Stellar Models;
 Stellar Radiation;
 Adiabatic Equations;
 Equations Of State;
 Graphs (Charts);
 Hydrodynamics;
 Hydrostatics;
 Stellar Evolution;
 Astrophysics;
 Collapse:Stellar Interiors;
 Gravitational Radiation:Stellar Interiors;
 Neutrinos:Stellar Interiors