Supernova Asymmetries




Wheeler, J. C.
Maund, J. R.
Akiyama, S.

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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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J. Craig Wheeler, Justyn R. Maund, and Shizuka Akiyama. AIP Conference Proceedings 937, 349 (Oct., 2007); doi: 10.1063/1.3682928