Supernova Asymmetries

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2007-04-30

arxiv.org/abs/0704.3960v1

AIP Conf.Proc.937:349-356,2007

Astronomy and Astrophysics

Astrophysics

8 pages, 3 figures, to be published in the proceedings of the conference "Supernova 1987A: 20 Years After" Aspen, 2007

Scientific paper

10.1063/1.2803590

All core collapse supernovae are strongly aspherical. The "Bochum event," with velocity components displaced symmetrically about the principal H$\alpha$ line, strongly suggests that SN 1987A was a bi-polar rather than a uni-polar explosion. While there is a general tendency to display a single prominant axis in images and spectropolarimetry, there is also growing evidence for frequent departures from axisymmetry. There are various mechanisms that might contribute to large scale departures from spherical symmetry: jet-induced processes, the spherical shock accretion instability (SASI) and associated phenomena, and non-axisymmetric instabilities (NAXI). The MRI gives inevitable production of large toroidal magnetic fields. In sum: no $\Omega$ without B. The role of magnetic fields, non-axisymmetric instabilities, and of the de-leptonization phase are discussed.

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