Magnetohydrodynamic Turbulence Powered by Magnetorotational Instability in Nascent Proto-Neutron Stars

Abstract

Magnetorotational instability (MRI) in a convectively-stable layer around the neutrinosphere is simulated by a three-dimensional model of supernova core. To resolve MRI-unstable modes, a thin layer approximation considering only the radial global stratification is adopted. Our intriguing finding is that the convectively-stable layer around the neutrinosphere becomes fully-turbulent due to the MRI and its nonlinear penetration into the strongly-stratified MRI-stable region. The intensity of the MRI-driven turbulence increases with magnetic flux threading the core, but is limited by a free energy stored in the differential rotation. The turbulent neutrinosphere is a natural consequence of rotating core-collapse and could exert a positive impact on the supernova mechanism.

Accepted for publication in ApJ Letters (6 pages, 5 figures) [several written mistakes in the parameter setting are corrected]

References in corpus (6)

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• Magnetorotational Core-Collapse Supernovae in Three Dimensions
• Semi-global simulations of the magneto-rotational instability in core collapse supernovae
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Cited by in corpus (8)

• The explosion mechanism of core-collapse supernovae: progress in supernova theory and experiments
• Anisotropic emission of neutrino and gravitational-wave signals from rapidly rotating core-collapse supernovae
• Numerical simulations of the magnetorotational instability in protoneutron stars: I. Influence of buoyancy
• Pre-collapse Properties of Superluminous Supernovae and Long Gamma-Ray Burst Progenitor Models
• Insights into non-axisymmetric instabilities in three-dimensional rotating supernova models with neutrino and gravitational-wave signatures
• Two-dimensional numerical study for magnetic field dependence of neutrino-driven core-collapse supernova models
• A Comparison of 2D Magnetohydrodynamic Supernova Simulations with the CoCoNuT-FMT and Aenus-Alcar Codes
• Quasi-two-dimensional nonlinear evolution of helical magnetorotational instability in a magnetized Taylor-Couette flow