Asymmetric Explosions of Type Ia Supernovae
Abstract
The burning speed of a thermonuclear supernova front could be described by the fractal model of combustion. We have examined the effects of magnetic fields on the fractalization of the front considering a white dwarf with a nearly dipolar magnetic field and found an intrinsic asymmetry on the velocity field of the expanding plasma. For white dwarf's magnetic fields of 10^8-10^9 G at the surface, and assuming a field roughly 10 times greater near the center, we have found asymmetries in the velocity field > 10-20 % at rho ~ 10^8 g cm^(-3), produced between the magnetic polar and the equatorial axis of the remnant. This effect may be related to the asphericities inferred from spectro-polarimetric observations of very young SN Ia remnants (for example: SN 1999by). In the present work, we analyse the dependence of the asymmetry with the composition of the white dwarf progenitor.
Cite
@article{arxiv.astro-ph/0208483,
title = {Asymmetric Explosions of Type Ia Supernovae},
author = {Cristian R. Ghezzi and E. M. de Gouveia Dal Pino and Jorge E. Horvath},
journal= {arXiv preprint arXiv:astro-ph/0208483},
year = {2007}
}
Comments
8 pages, 2 figures, Proc. of "Frontiers of the Universe", 17th - 23rd June 2001, XIII Rencontres de Blois