Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-08
Astronomy and Astrophysics
Astrophysics
Accepted for publication in The Astrophysical Journal, 5 pages, 4 figures
Scientific paper
10.1086/524189
Prior to the incineration of a white dwarf (WD) that makes a Type Ia supernova (SN Ia), the star "simmers" for ~1000 years in a convecting, carbon burning region. We have found that weak interactions during this time increase the neutron excess by an amount that depends on the total quantity of carbon burned prior to the explosion. This contribution is in addition to the metallicity (Z) dependent neutronization through the 22Ne abundance (as studied by Timmes, Brown, & Truran). The main consequence is that we expect a floor to the level of neutronization that dominates over the metallicity contribution when Z/Z_\odot<2/3, and it can be important for even larger metallicities if substantial energy is lost to neutrinos via the convective Urca process. This would mask any correlations between SN Ia properties and galactic environments at low metallicities. In addition, we show that recent observations of the dependences of SNe Ia on galactic environments make it clear that metallicity alone cannot provide for the full observed diversity of events.
Bildsten Lars
Piro Anthony L.
No associations
LandOfFree
Neutronization During Type Ia Supernova Simmering 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 Neutronization During Type Ia Supernova Simmering, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Neutronization During Type Ia Supernova Simmering will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-544623