2008 Supplement: Frascati Workshop 2007 / Bisnovatyi-Kogan

Magnetorotational Supernovae with Jets

G. S. Bisnovatyi-Kogan, S. G. Moiseenko

Abstract

Core-collapse supernovae are accompanied by formation of neutron stars.
The gravitation energy is transformed into the energy of the explosion,
observed as SN II, SN Ib,c type supernovae. We present results of 2-D
MHD simulations, where the source of energy is rotation, and magnetic
field serves as a ``transition belt" for the transformation of the
rotation energy into the energy of the explosion. The toroidal part of
the magnetic energy initially grows linearly with time due to
differential rotation. When the twisted toroidal component strongly
exceeds the poloidal field, magneto-rotational instability (MRI)
develops, leading to a drastic acceleration in the growth of magnetic
energy. Finally, a MHD shock wave is formed, producing a supernova
explosion. Toy model of MRI development is presented. Mildly collimated
jet is produced for dipole-like type of the initial field.
Magnetorotational explosion may produce mirror asymmetric ejection,
visible in the form of asymmetric jet, and formation of rapidly moving
neutron stars - pulsars. Observational data on radio pulsars are
discussed, which are well interpreted in this model.

Keywords


supernovae jets magnetic field

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