Magnetorotational processes in core collapse supernovae

Abstract

Results of 2D simulations of magnetorotational(MR) mechanism of core collapse supernova explosions are discussed. Nonuniform collapse of rotating core leads to differential rotation of the core. The differential rotation and initial poloidal magnetic field results in appearance of toroidal component of the magnetic field and its growth with time. Increased magnetic pressure leads to the formation of a compression wave which moves outwards. It transforms into the fast MHD shock wave (supernova shock wave). The shape of the MR supernova explosion qualitatively depends on the configuration of the initial magnetic field. For a dipole‐like initial magnetic field the supernova explosion develops mainly along the rotational axis forming a mildly collimated jet. Quadrupole‐like initial magnetic field leads to the explosion developing mainly along equatorial plane. The magnetorotational instability(MRI) was found in our simulations. MRI results in exponential growth of all components of the magnetic field. The supernova explosion energy grows with an increase of the initial core mass and rotational energy of the core, and corresponds to the observational data. Special features and difficulties of 3D simulations of magnetorotational supernova explosions are discussed.