2012

Three-dimensional neutrino-driven supernovae: Neutron star kicks, spins, and asymmetric ejection of nucleosynthesis products

Wongwathanarat, A., Janka, H. -Th., Mueller, E.

Understand

We present 3D simulations of supernova (SN) explosions of nonrotating stars, triggered by the neutrino-heating mechanism with a suitable choice of the core-neutrino luminosity.

  • Our results show that asymmetric mass ejection caused by hydrodynamic instabilities can accelerate the neutron star (NS) up to recoil velocities of more than 700 km/s by the "gravitational tug-boat mechanism", which is enough to explain most observed pulsar velocities.
  • The associated NS spin periods are about 100 ms to 8 s without any correlation between spin and kick magnitudes or directions.
  • This suggests that faster spins and a possible spin-kick alignment might require angular momentum in the progenitor core prior to collapse.

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