EXPLOSION MODELS FOR TYPE Ia SUPERNOVAE: A COMPARISON WITH OBSERVED LIGHT CURVES, DISTANCES, H_0, AND q_0

摘要

Theoretical monochromatic light curves and photospheric expansion velocities are compared with observations of 27 Type Ia supernovae (SN Ia's). A set of 37 models has been considered which encompasses all currently discussed explosion scenarios for Type Ia supernovae including deflagrations, detonations, delayed detonations, pulsating delayed detonations and tamped detonations of Chandrasekhar mass, and helium detonations of low-mass white dwarfs. The explosions are calculated using one-dimensional Lagrangian hydro and radiation-hydro codes with incorporated nuclear networks. Subsequently, light curves are constructed using our light-curve (LC) scheme which includes an implicit radiation transport, expansion opacities, a Monte Carlo γ-ray transport, and molecular and dust formation. For some supernovae, results of detailed non-LTE calculations have been considered. Observational properties of our series of models are discussed, in particular, the relation between the absolute brightness, postmaximum decline rates, the colors at several moments of time, etc. All models with a ~(56)Ni production larger than ≈0.4 solar mass produce light curves of similar brightness. The influence of the cosmological redshift on the light curves and on the correction for interstellar reddening is discussed.