Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae

Details Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae

2005-12-02

arxiv.org/abs/astro-ph/0512065v2

Astron.Astrophys.450:345-350,2006

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures; referee's comments included; Astronomy & Astrophysics, accepted

Scientific paper

10.1051/0004-6361:20054703

We present results of simulations of stellar collapse and explosions in spherical symmetry for progenitor stars in the 8-10 solar mass range with an O-Ne-Mg core. The simulations were continued until nearly one second after core bounce and were performed with the Prometheus/Vertex code with a variable Eddington factor solver for the neutrino transport, including a state-of-the-art treatment of neutrino-matter interactions. Particular effort was made to implement nuclear burning and electron capture rates with sufficient accuracy to ensure a smooth continuation, without transients, from the progenitor evolution to core collapse. Using two different nuclear equations of state (EoSs), a soft version of the Lattimer & Swesty EoS and the significantly stiffer Wolff & Hillebrandt EoS, we found no prompt explosions, but instead delayed explosions, powered by neutrino heating and the neutrino-driven baryonic wind which sets in about 200 ms after bounce. The models eject little nickel (< 0.015 solar masses), explode with an energy of about or slightly more than 10**50 erg, and leave behind neutron stars (NSs) with a baryonic mass near 1.36 solar masses. Different from previous models of such explosions, the ejecta during the first second have a proton-to-baryon ratio of Ye > 0.46, which suggests a chemical composition that is not in conflict with galactic abundances. No low-entropy matter with Ye << 0.5 is ejected. This excludes such explosions as sites of a low-entropy r-process. The low explosion energy and nucleosynthetic implications are compatible with the observed properties of the Crab supernova, and the small nickel mass supports the possibility that our models explain some subluminous Type II-P supernovae.

Affiliated with

Also associated with

No associations

Rating

Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P 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 Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Explosions of O-Ne-Mg Cores, the Crab Supernova, and Subluminous Type II-P Supernovae will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-529326