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Magnetically assisted explosions of weakly magnetized stars

Published online by Cambridge University Press:  17 October 2017

Hidetomo Sawai and
Shoichi Yamada
Hidetomo Sawai
Affiliation:
Research Organization for Information Science & Technology, Minatojima-Minamimachi 1-5-2, Chuo, Kobe, Hyogo, Japan email: hsawai@rist.or.jpScinence & Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan
Shoichi Yamada
Affiliation:
Scinence & Engineering, Waseda University, Okubo 3-4-1, Shinjuku, Tokyo, Japan
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Abstract

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We carried out high resolution simulations of weakly-magnetized core-collapse supernovae in two-dimensional axisymmetry in order to see the influence of the magnetic field and rotation on the explosion. We found that the magnetic field amplified by magnetorotational instability (MRI) has a great positive impact on the explosion by enhancing the neutrino heating, provided that the progenitor has large angular momentum close to the highest value found in stellar evolution calculations. We also found that even for progenitors neither involving strong magnetic flux nor large angular momentum, the magnetic field is greatly amplified by the convection aand rotation, and this leads to the boost of the explosion again by enhancing the neutrino heating.

Keywords

supernovae: generalMHDinstabilitiesmethods: numerical

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