Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 798, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/798/1/L22
Keywords
instabilities; magnetohydrodynamics (MHD); stars: interiors; supernovae: general; turbulence
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Funding
- Ministry of Education, Science and Culture of Japan [24740125, 26870823, 24244036, 24103006, 26707013]
- Grants-in-Aid for Scientific Research [24740125, 24103006, 26707013] Funding Source: KAKEN
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Magnetorotational instability (MRI) in a convectively stable layer around the neutrinosphere is simulated by a three-dimensional model of a 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 the 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.
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