Effects of Resistivity on Magnetized Core-Collapse Supernovae

Abstract

We studied roles of a turbulent resistivity in the core-collapse of a strongly magnetized massive star, carrying out 2D-resistive-MHD simulations. The three cases with different initial strengths of magnetic field and rotation are investigated; 1. strongly magnetized rotating core; 2.moderately magnetized rotating core; 3. very strongly magnetized non-rotating core. In each case, both an ideal-MHD model and resistive-MHD models are computed. As a result of computations, each model shows a matter eruption helped by a magnetic acceleration (and also by a centrifugal acceleration in the rotating cases). We found that a resistivity attenuates the explosion in case~1 and 2, while it enhances the explosion in case~3. We also found that in the rotating cases, main mechanisms for the amplification of a magnetic field in the post-bounce phase are an outward advection of magnetic field and a winding of poloidal magnetic field-lines by differential rotation, which are somewhat dampened down with the presence of a resistivity. Although the magnetorotational instability seems to occur in the rotating models, it will play only a minor role in a magnetic field amplification. Another impact of resistivity is that on the aspect ratio. In the rotating cases, a large aspect ratio of the ejected matters, $>2.5$, attained in a ideal-MHD model is reduced to some extent in a resistive model. These results indicate that a resistivity possibly plays an important role in the dynamics of strongly magnetized supernovae.

43 pages, 63 figures, accepted for publication in ApJ, typos corrected

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• Global Simulations of Magnetorotational Instability in The Collapsed Core of A Massive Star
• The Outcome of Supernovae in Massive Binaries; Removed Mass, and its Separation Dependence
• The Evolution and Impacts of Magnetorotational Instability in Magnetized Core-Collapse Supernovae
• Magnetic support for neutrino-driven explosion of 3D non-rotating core-collapse supernova models
• Influence of Magnetorotational Instability on Neutrino Heating: A New Mechanism for Weakly Magnetized Core-Collapse Supernovae
• Two-dimensional numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
• Possible Signatures of Ejecta-Companion Interaction in iPTF 13bvn
• Magnetorotational Mechanism of the Explosion of Core-Collapse Supernovae