Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sf2a.conf..173g&link_type=abstract
SF2A-2010: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics. Eds.: S. Boissier, M. Heydari-
Astronomy and Astrophysics
Astrophysics
Supernovae: General, Magnetic Fields, Magnetohydrodynamics, Instabilities, Shock Waves
Scientific paper
Most studies of core collapse supernovae either neglect any magnetic effect, or assume a very rapid rotation that can amplify the magnetic field enough to produce a magnetically driven explosion (the magnetic pressure is then comparable to the thermal pressure). The effects of a moderate magnetic field that would not be capable of driving an explosion by itself are thus mostly unknown. We suggest that the fluid dynamics could be significantly affected by a magnetic field, which energy is comparable to the kinetic energy. In a very subsonic flow, this condition can be fulfilled even if the magnetic pressure remains small. We study the effect of such a moderately strong magnetic field on the standing accretion shock instability (SASI), using a simplified model of this instability. SASI can be stabilized or strengthened depending on the geometry of the magnetic field. We then describe the dynamics of the singular Alfvén surface where the Alfvén velocity equals the advection velocity (which is equivalent to the magnetic energy being comparable to the kinetic energy). Alfvén waves created by SASI are amplified near this surface. This amplification sends a positive pressure feedback toward the shock, which could be significant to the shock dynamics.
Foglizzo Thierry
Fromang Sebastien
Guilet Jerome
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