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 ～ 10{sup}50 erg s{sup}(-1) and a neutrino emission duration of ～ 1 sec. The average energy of the neutrinos was found to be ～ 4 MeV. Electron neutrinos generated in the central region of SN Ia ejecta undergo flavor interchanges between v{sub}e, v{sub}μ, and v{sub}τ neutrinos due to neutrino oscillation in matter. As a result of this oscillation, the fraction of electron neutrinos decreases to ～ 0.55 outside of the ejecta. The prospect of detecting SN Ia neutrinos and the implications for progenitor scenarios of SNe Ia are also discussed.
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