Dynamics of shock propagation and nucleosynthesis conditions in O-Ne-Mg core supernovae

Abstract

Recently, Ning, Qian, _s13 Meyer 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 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., or that some essential core properties with influence on the explosion dynamics might be different from those predicted by Nomoto_s14s progenitor model.