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Abstract: Aims: We present neutrino light curves and energy spectra for tworepresentative type Ia supernova explosion models: a pure deflagration and adelayed detonation. Methods: We calculate the neutrino flux from $\beta$processes using nuclear statistical equilibrium abundances convoluted withapproximate neutrino spectra of the individual nuclei and the thermal neutrinospectrum pair+plasma. Results: Although the two considered thermonuclearsupernova explosion scenarios are expected to produce almost identicalelectromagnetic output, their neutrino signatures appear vastly different,which allow an unambiguous identification of the explosion mechanism: a puredeflagration produces a single peak in the neutrino light curve, while theaddition of the second maximum characterizes a delayed-detonation. Weidentified the following main contributors to the neutrino signal: 1 weakelectron neutrino emission from electron captures in particular on the protonsCo55 and Ni56 and numerous beta-active nuclei produced by the thermonuclearflame and-or detonation front, 2 electron antineutrinos from positroncaptures on neutrons, and 3 the thermal emission from pair annihilation. Weestimate that a pure deflagration supernova explosion at a distance of 1 kpcwould trigger about 14 events in the future 50 kt liquid scintillator detectorand some 19 events in a 0.5 Mt water Cherenkov-type detector. Conclusions:While in contrast to core-collapse supernovae neutrinos carry only a very smallfraction of the energy produced in the thermonuclear supernova explosion, theSN Ia neutrino signal provides information that allows us to unambiguouslydistinguish between different possible explosion scenarios. These studies willbecome feasible with the next generation of proposed neutrino observatories.

Autor: A. Odrzywolek, T. Plewa


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