Three Dimensional Magnetohydrodynamical Simulations of Core Collapse Supernova

Abstract

We show three-dimensional magnetohydrodynamical simulations of core collapse supernova in which the progenitor has magnetic fields inclined to the rotation axis. The simulations employed a simple empirical equation of state in which the pressure of degenerate gas is approximated by piecewise polytropes for simplicity. Neither energy loss due to neutrino is taken into account for simplicity. The simulations start from the stage of dynamical collapse of an iron core. The dynamical collapse halts at $t$ = 189 ms by the pressure of high density gas and a proto-neutron star (PNS) forms. The evolution of PNS was followed about 40 milli-seconds in typical models. When the initial rotation is mildly fast and the initial magnetic fields are mildly strong, bipolar jets are launched from an upper atmosphere ($r\sim 60\mathrm{km}$) of the PNS. The jets are accelerated to $\sim 3\times 10^4$ km s${}^{-1}$, which is comparable to the escape velocity at the foot point. The jets are parallel to the initial rotation axis. Before the launch of the jets, magnetic fields are twisted by rotation of the PNS. The twisted magnetic fields form torus-shape multi-layers in which the azimuthal component changes alternately. The formation of magnetic multi-layers is due to the initial condition in which the magnetic fields are inclined with respect to the rotation axis. The energy of the jet depends only weakly on the initial magnetic field assumed. When the initial magnetic fields are weaker, the time lag is longer between the PNS formation and jet ejection. It is also shown that the time lag is related to the Alfvén transit time. Although the nearly spherical prompt shock propagates outward in our simulations, it is ...

41 pages, 24 figures, 4 tables, accepted for publication in ApJ. The high resolution version is available at http://www.astro.phys.s.chiba-u.ac.jp/~mikami/research/

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• Magnetic field amplification and magnetically supported explosions of collapsing, non-rotating stellar cores
• Exploding Core-Collapse Supernovae with Jittering Jets
• The Early Asymmetries of Supernova 2008D / XRF 080109
• Generation of Magnetic Fields by the Stationary Accretion Shock Instability
• Termination of the magnetorotational instability via parasitic instabilities in core-collapse supernovae
• Spectropolarimetry of the Unique Type Ib Supernova 2005bf: Larger Asymmetry Revealed by Later-Phase Data
• The Evolution and Impacts of Magnetorotational Instability in Magnetized Core-Collapse Supernovae
• Spectropolarimetry of the Type Ib Supernova iPTF 13bvn: Revealing the complex explosion geometry of a stripped-envelope core-collapse supernova
• Three Dimensional Magneto Hydrodynamical Simulations of Gravitational Collapse of a 15Msun Star
• An Extension of the Athena++ Framework for Fully Conservative Self-Gravitating Hydrodynamics
• Nucleosynthesis of r-Process Elements by Jittering Jets in Core-Collapse Supernovae
• Neutron stars formation and Core Collapse Supernovae
• Energy conserving and well-balanced discontinuous Galerkin methods for the Euler-Poisson equations in spherical symmetry
• Neutrino oscillation and expected event rate of supernova neutrinos in adiabatic explosion model
• Towards Higher Order Accuracy in Self-Gravitating Hydrodynamics