Electron fraction constraints based on nuclear statistical equilibrium with beta equilibrium

A. Arcones, G. Martínez-Pinedo, L. F. Roberts, S. E. Woosley
2010 Astronomy and Astrophysics  
The electron-to-nucleon ratio or electron fraction is a key parameter in many astrophysical studies. Its value is determined by weak-interaction rates that are based on theoretical calculations subject to several nuclear physics uncertainties. Consequently, it is important to have a model independent way of constraining the electron fraction value in different astrophysical environments. Here we show that nuclear statistical equilibrium combined with beta equilibrium can provide such a
more » ... t. We test the validity of this approximation in presupernova models and give lower limits for the electron fraction in type Ia supernova and accretion-induced collapse.
doi:10.1051/0004-6361/201014276 fatcat:s5qictepv5dapa6rtp5qgzn3ci