A simple model of time-dependent ionization in Type IIP supernova envelopes

M. Potashov, A. Yudin

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1 Citation (Scopus)

Abstract

We propose a model kinetic system of the hydrogen atom (two levels plus continuum) under the conditions typical for atmospheres of Type IIP supernovae in the plateau stage. Despite the simplicity of this system, it describes realistically the basic properties of the complete system. Analysis shows that the ionization 'freeze-out' effect is always manifest at large times. We give a simple criterion for checking the statistical equilibrium of a system under the given conditions at any time. It is shown that if the system is in non-equilibrium at early times, the time-dependent effect of ionization necessarily exists. We also generalize this criterion to the case of arbitrary multilevel systems. We discuss various factors that affect the strength of the time-dependent effect in the kinetics during the photospheric phase of a supernova explosion.

Original languageEnglish
Pages (from-to)2674-2687
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume491
Issue number2
DOIs
Publication statusPublished - 1 Jan 2020

Keywords

  • Atomic processes
  • Methods: analytical
  • Stars: atmospheres
  • Supernovae: general

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