Neutrino-driven wind and wind termination shock in supernova cores

Details Neutrino-driven wind and wind termination shock in supernova cores Neutrino-driven wind and wind termination shock in supernova cores

2006-12-21

arxiv.org/abs/astro-ph/0612629v3

PoSNIC-IX:231,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX, CERN, Geneva, Switzerland, 25

Scientific paper

The neutrino-driven wind from a nascent neutron star at the center of a supernova expands into the earlier ejecta of the explosion. Upon collision with this slower matter the wind material is decelerated in a wind termination shock. By means of hydrodynamic simulations in spherical symmetry we demonstrate that this can lead to a large increase of the wind entropy, density, and temperature, and to a strong deceleration of the wind expansion. The consequences of this phenomenon for the possible r-process nucleosynthesis in the late wind still need to be explored in detail. Two-dimensional models show that the wind-ejecta collision is highly anisotropic and could lead to a directional dependence of the nucleosynthesis even if the neutrino-driven wind itself is spherically symmetric.

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