Threedimensional Simulations of Pure Deflagration Models for Thermonuclear Supernovae
Abstract
We present a systematic study of the pure deflagration model of Type Ia supernovae (SNe Ia) using threedimensional, highresolution, fullstar hydrodynamical simulations, nucleosynthetic yields calculated using Lagrangian tracer particles, and light curves calculated using radiation transport. We evaluate the simulations by comparing their predicted light curves with many observed SNe Ia using the SALT2 datadriven model and find that the simulations may correspond to underluminous SNe Iax. We explore the effects of the initial conditions on our results by varying the number of randomly selected ignition points from 63 to 3500, and the radius of the centered sphere they are confined in from 128 to 384 km. We find that the rate of nuclear burning depends on the number of ignition points at early times, the density of ignition points at intermediate times, and the radius of the confining sphere at late times. The results depend primarily on the number of ignition points, but we do not expect this to be the case in general. The simulations with few ignition points release more nuclear energy E _{nuc}, have larger kinetic energies E _{K}, and produce more ^{56}Ni than those with many ignition points, and differ in the distribution of ^{56}Ni, Si, and C/O in the ejecta. For these reasons, the simulations with few ignition points exhibit higher peak Bband absolute magnitudes M _{B} and light curves that rise and decline more quickly; their M _{B} and light curves resemble those of underluminous SNe Iax, while those for simulations with many ignition points are not.
 Publication:

The Astrophysical Journal
 Pub Date:
 July 2014
 DOI:
 10.1088/0004637X/789/2/103
 arXiv:
 arXiv:1307.8221
 Bibcode:
 2014ApJ...789..103L
 Keywords:

 hydrodynamics;
 methods: numerical;
 nuclear reactions;
 nucleosynthesis;
 abundances;
 supernovae: general;
 white dwarfs;
 Astrophysics  High Energy Astrophysical Phenomena;
 Astrophysics  Solar and Stellar Astrophysics
 EPrint:
 Submitted to ApJ, 23 pages, 19 figures. A 3D animation is provided at http://flash.uchicago.edu/~long/PureDef/8kmPureDefDDTCompositions1365x768.mp4