Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. II. The reverse shock in two-dimensional simulations - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




Nucleosynthesis-relevant conditions in neutrino-driven supernova outflows. II. The reverse shock in two-dimensional simulations - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: After the initiation of the explosion of core-collapse supernovae, neutrinosemitted from the nascent neutron star drive a supersonic baryonic outflow. Thisneutrino-driven wind interacts with the more slowly moving, earlier supernovaejecta forming a wind termination shock or reverse shock, which changes thelocal wind conditions and their evolution. Important nucleosynthesis processesalpha-process, charged-particle reactions, r-process, and vp-process occur ormight occur in this environment. The nucleosynthesis depends on the long-timeevolution of density, temperature, and expansion velocity. Here we presenttwo-dimensional hydrodynamical simulations with an approximate description ofneutrino-transport effects, which for the first time follow the post-bounceaccretion, onset of the explosion, wind formation, and the wind expansionthrough the collision with the preceding supernova ejecta. Our resultsdemonstrate that the anisotropic ejecta distribution has a great impact on theposition of the reverse shock, the wind profile, and the long-time evolution.This suggests that hydrodynamic instabilities after core bounce and theconsequential asymmetries may have important effects on thenucleosynthesis-relevant conditions in the neutrino-heated baryonic mass flowfrom proto-neutron stars.



Author: A. Arcones, H.-T. Janka

Source: https://arxiv.org/



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