A new algorithm for supernova neutrino transport and some applications

Adam S. Burrows, Timothy Young, Philip Pinto, Ron Eastman, Todd A. Thompson

Research output: Contribution to journalArticle

105 Scopus citations

Abstract

We have developed an implicit, multigroup, time-dependent, spherical neutrino transport code based on the Feautrier variables, the tangent-ray method, and accelerated A iteration. The code achieves high angular resolution, is good to O(v/c), is equivalent to a Boltzmann solver (without gravitational redshifts), and solves the transport equation at all optical depths with precision. In this paper, we present our formulation of the relevant numerics and microphysics and explore protoneutron star atmospheres for snapshot postbounce models. Our major focus is on spectra, neutrino-matter heating rates, Eddington factors, angular distributions, and phase-space occupancies. In addition, we investigate the influence on neutrino spectra and heating of final-state electron blocking, stimulated absorption, velocity terms in the transport equation, neutrino-nucleon scattering asymmetry, and weak magnetism and recoil effects. Furthermore, we compare the emergent spectra and heating rates obtained using full transport with those obtained using representative flux-limited transport formulations to gauge their accuracy and viability. Finally, we derive useful formulae for the neutrino source strength due to nucleon-nucleon bremsstrahlung and determine bremsstrahlung's influence on the emergent vμ and vτ neutrino spectra. These studies are in preparation for new calculations of spherically symmetric core-collapse supernovae, proto neutron star winds, and neutrino signals.

Original languageEnglish (US)
Pages (from-to)865-887
Number of pages23
JournalAstrophysical Journal
Volume539
Issue number2 PART 1
DOIs
StatePublished - Aug 20 2000

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Elementary particles
  • Methods: numerical
  • Radiative transfer
  • Stars: interiors
  • Stars: neutron
  • Supernovae: general

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    Burrows, A. S., Young, T., Pinto, P., Eastman, R., & Thompson, T. A. (2000). A new algorithm for supernova neutrino transport and some applications. Astrophysical Journal, 539(2 PART 1), 865-887. https://doi.org/10.1086/309244