Abstract
Based on detailed models for the explosions, light curves and NLTE-spectra, evolutionary effects of Type Ia Supernovae (SNe Ia) with redshift have been studied to evaluate their size on cosmological time scales, how the effects can be recognized and how one may be able to correct for them. In the first part, we summarize the current status of scenarios for Type Ia Supernovae, including the explosion of a Chandrasekhar mass white dwarf (MCh-WD), the merging scenario and the helium-triggered explosions of low-mass WDs. We show that delayed detonation models can account for the majority of observations of spectra and light curves. IR observations are a new and powerful tools to constrain explosion models and details of the flame propagation in the WD. A strong Mg II line at 1.05 μm shows that nuclear burning takes place at the outer, low density layers. This requires a transition from the deflagration to the detonation regime of the nuclear burning front, or a very fast deflagration close to the speed of sou...
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