Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-12-27
Astronomy and Astrophysics
Astrophysics
10 pages, 11 figures; accepted by Astronomy & Astrophysics; significantly extended to account for referee's suggestions and qu
Scientific paper
10.1051/0004-6361:20079334
It has been recently proposed that the shocked surface layers of exploding O-Ne-Mg cores provide the conditions for r-process nucleosynthesis, because their rapid expansion and high entropies enable heavy r-process isotopes to form even in an environment with very low initial neutron excess of the matter. We show here that the most sophisticated available hydrodynamic simulations (in spherical and axial symmetry) do not support this new r-process scenario because they fail to provide the necessary conditions of temperature, entropy, and expansion timescale by significant factors. This suggests that, either the formation of r-process elements works differently than suggested by Ning et al. (2007, NQM07), or that some essential core properties with influence on the explosion dynamics might be different from those predicted by Nomoto's progenitor model.
Buras Robert
Janka H.-Th.
Kitaura Francisco-Shu
Mueller Beatrice
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