Ionization by HighEnergy Particles and the Electron Scattering Opacity in Supernovae
Abstract
Ionization equilibrium equations appropriate for supernova atmospheres are described. The solution of these equations indicate the highenergy particles associated with radioactive Ni56 and Co56 decay sustain a significant degree of ionization in the supernova plasma. Under certain physical conditions, the resulting electron scattering opacity can be many orders of magnitude greater than LTE estimates predict. A straightforward application of the present results to standard (diffusion approximation) hydrodynamic computations is proposed in which the nonLTE electron scattering opacity is expressed in terms of the local radioactive decay energy deposition rate and the mass density. Application to an analytic supernova dynamic evolution computation is presented to illustrate the results expected from more detailed calculations.
 Publication:

The Astrophysical Journal
 Pub Date:
 June 1991
 DOI:
 10.1086/170079
 Bibcode:
 1991ApJ...373..604S
 Keywords:

 Electron Scattering;
 Energetic Particles;
 Radiative Transfer;
 Stellar Atmospheres;
 Stellar Interiors;
 Supernovae;
 Cobalt Isotopes;
 Local Thermodynamic Equilibrium;
 Nickel Isotopes;
 Opacity;
 Radioactive Decay;
 Space Plasmas;
 Astrophysics;
 OPACITIES;
 RADIATIVE TRANSFER;
 STARS: INTERIORS;
 STARS: SUPERNOVAE