Neutrino emission from type Ia supernovae

摘要

Type Ia supernovae (SNe Ia) produce a burst of neutrino emission due to electron captures on free protons and nuclei in the hot, dense matter synthesized by explosive nucleosynthesis. We calculated the luminosity and energy spectrum of the burst for a standard SN Ia model W7. We found a peak luminosity of the total three-flavor neutrinos of similar to 10(50) ergs(-1) and a neutrino emission duration of similar to 1s. The average energy of the neutrinos was found to be similar to 3MeV. Electron neutrinos generated in the central region of SN la undergo flavor oscillations between nu e, nu nu(mu), and nu(tau), As a result, the fraction of electron neutrinos is reduced to similar to 0.55. The detectability of these neutrinos and the implications for progenitor scenarios of SNe Ia are discussed.