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Asymmetric Explosions of Type Ia Supernovae

Cristian R. Ghezzi·E. M. de Gouveia Dal Pino·Jorge E. Horvath
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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.

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Cristian R. Ghezzi, E. M. de Gouveia Dal Pino, Jorge E. Horvath. 2002-08-27. Asymmetric Explosions of Type Ia Supernovae. https://arxiv.org/abs/astro-ph/0208483

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