Skip to main content
Article thumbnail
Location of Repository

Preprint typeset using L ATEX style emulateapj v. 6/22/04 MULTI-DIMENSIONAL RADIATION/HYDRODYNAMIC SIMULATIONS OF PROTONEUTRON STAR CONVECTION

By L. Dessart, A. Burrows, E. Livne and C. D. Ott

Abstract

Based on multi-dimensional multi-group radiation hydrodynamic simulations of core-collapse supernovae with the VULCAN/2D code, we study the physical conditions within and in the vicinity of the nascent protoneutron star (PNS). Conclusions of this work are threefold: First, as before, we do not see any large-scale overturn of the inner PNS material. Second, we see no evidence of doubly-diffusive instabilities in the PNS, expected to operate on diffusion timescales of at least a second, but instead observe the presence of convection, within a radius range of 10-20km, operating with a timescale of a few milliseconds. Third, we identify unambiguously the presence of gravity waves, predominantly at 200-300milliseconds (ms) past core bounce, in the region separating the convective zones inside the PNS and between the PNS surface and the shocked region. Our numerical study is an improvement over past work in a number of ways: we follow the evolution of the collapsing envelope from ∼200ms before bounce to ∼500ms after bounce; the spatial grid switches from Cartesian inside to spherical outside, permitting a handling of the inner PNS region at good spatial resolution, all the way inside to the center, and without severe Courant-time limitation; neutrino-transport is treated with a Multi-Group, Flux-Limited-Diffusion (MGFLD) approach, wel

Year: 2008
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.2885
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://citeseerx.ist.psu.edu/v... (external link)
  • http://arxiv.org/pdf/astro-ph/... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.