Magnetorotational Core-Collapse Supernovae in Three Dimensions

Philipp Moesta (Caltech) - October 27, 2014 at 12:10 pm

Core-collapse in rapidly rotating, strongly magnetized progenitors may power some of the most luminous supernovae we observe and possibly set the stage for a subsequent long gamma-ray burst. I will present results of new three-dimensional (3D) general-relativistic magnetohydrodynamic simulations of core collapse in these progenitors that include a microphysical finite-temperature equation of state and an approximate neutrino transport scheme. My results show that the 3D dynamics of magnetorotational core-collapse supernovae are fundamentally different from what was anticipated on the basis of previous simulations in axisymmetry (2D). A strong bipolar jet that develops in a simulation constrained to 2D is crippled by a m=1 kink instability of the ultra-strong toroidal magnetic field and fizzles in full 3D. Instead, highly magnetized spiral plasma funnels push out the shock into wide secularly expanding lobes, drastically changing the explosion geometry and signature.

The seminar will be held in 131A Campbell Hall.

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