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| Paper: |
Three-dimensional Core-Collapse Supernova Simulations on the Yin-Yang Grid |
| Volume: |
453, Advances in Computational Astrophysics: Methods, Tools, and Outcome |
| Page: |
95 |
| Authors: |
Wongwathanarat, A.; Janka, H.; Müller, E. |
| Abstract: |
We perform a set of neutrino-driven core collapse supernova
simulations in three dimensions studying the hydrodynamical neutron
star (NS) kick mechanism. The computational cost is reduced significantly
with the help of an axis-free overlapping grid technique in spherical
geometry called the “Yin-Yang” grid. Our simulations follow the
evolution of core collapse supernovae from 15 ms after bounce until
approximately 1.4 s later. For the first time in three dimensions, our
results produce neutron star kick velocities up to ∼600 km/s. Such a
high kick velocity results from the highly asymmetric mass
distribution in the post-shock region exerting a net gravitational
pull on the proto-neutron star on a timescale of a few seconds.
With this kick scenario proposed by Scheck et al., NS recoil
velocities larger than ∼1000 km/s might as well be possible but
require a larger set of models for statistical reasons (connected with
the stochastic development of asymmetries). Our simulations also
confirm an enhanced
production of heavy elements in the direction roughly opposite to the
NS recoil direction. This produces a detectable hemispheric asymmetry
in the distribution of heavy elements which can be used to constrain
the NS kick mechanism. |
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