Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-11-04
Physics Letters B 676 (2009), pp. 140-145
Astronomy and Astrophysics
Astrophysics
15 pages, 2 tables, 3 figures
Scientific paper
10.1016/j.physletb.2009.04.075
We investigate to what extent the temperature dependence of the nuclear symmetry energy can affect the neutronization of the stellar core prior to neutrino trapping during gravitational collapse. To this end, we implement a one-zone simulation to follow the collapse until beta equilibrium is reached and the lepton fraction remains constant. Since the strength of electron capture on the neutron-rich nuclei associated to the supernova scenario is still an open issue, we keep it as a free parameter. We find that the temperature dependence of the symmetry energy consistently yields a small reduction of deleptonization, which corresponds to a systematic effect on the shock wave energetics: the gain in dissociation energy of the shock has a small yet non-negligible value of about 0.4 foe (1 foe = 10^51 erg) and this result is almost independent from the strength of nuclear electron capture. The presence of such a systematic effect and its robustness under changes of the parameters of the one-zone model are significative enough to justify further investigations with detailed numerical simulations of supernova explosions.
Donati Paola
Fantina Anthea Francesca
Pizzochero Pierre M.
No associations
LandOfFree
Systematic thermal reduction of neutronization in core-collapse supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Systematic thermal reduction of neutronization in core-collapse supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systematic thermal reduction of neutronization in core-collapse supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-183927