Issue |
A&A
Volume 446, Number 2, February I 2006
|
|
---|---|---|
Page(s) | 627 - 633 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20054145 | |
Published online | 13 January 2006 |
Thermonuclear supernova simulations with stochastic ignition
Lehrstuhl für Astronomie, Institut für Theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany e-mail: schmidt@astro.uni-wuerzburg.de
Received:
15
July
2005
Accepted:
11
October
2005
We apply an ad hoc model for dynamical ignition in
three-dimensional numerical simulations of thermonuclear supernovae
assuming pure deflagrations. The model makes use of the statistical
description of temperature fluctuations in the pre-supernova core
proposed by Wunsch & Woosley (2004, ApJ, 616, 1102). Randomness in time is implemented by
means of a Poisson process. We are able to vary the explosion
energy and nucleosynthesis depending on the free parameter of the
model which controls the rapidity of the ignition process. However,
beyond a certain threshold, the strength of the explosion saturates
and the outcome appears to be robust with respect to the number of
ignitions. In the most energetic explosions, we find about
of iron group elements. Other than in simulations
with simultaneous multi-spot ignition, the amount of unburned carbon
and oxygen at radial velocities of a few
tends to be reduced for an ever increasing number of ignition
events and, accordingly, more pronounced layering results.
Key words: stars: supernovae: general / methods: numerical / stars: evolution / stars: interiors
© ESO, 2006
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