Core-Collapse Supernovae : Magnetorotational Explosions and Jet Formation(VIII Asia-Pacific International Conference on Gravitation and Astrophysics (ICGA8))

概要

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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 types. 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 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. Mildly collimated jet is produced for dipole-like type of the initial field. Magnetorotational explosion may produce mirror asymmetric ejection, with asymmetric jets, and rapidly moving pulsars.
理論物理学刊行会の論文
2008-07-09