Neutrino Emission from Type Ia Supernovae

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 $\sim$ 10 $^{50}$ ergs $^{-1}$ and a neutrino emission duration of $\sim$ 1s. The average energy of the neutrinos was found to be $\sim$ 3 MeV. Electron neutrinos generated in the central region of SN Ia undergo flavor oscillations between $v_e, v_\mu$ , and $v_\tau$ . As a result, the fraction of electron neutrinos is reduced to $\sim$ 0.55. The detectability of these neutrinos and the implications for progenitor scenarios of SNe Ia are discussed.