Critical ingredients of Type Ia supernova radiative-transfer modelling

摘要: We explore the physics of Type Ia supernova (SN Ia) light curves and spectra using 1D non-local thermodynamic equilibrium (non-LTE) time-dependent radiative-transfer code cmfgen. Rather than adjusting ejecta properties to match observations, we select as input one `standard' Chandrasekhar-mass delayed-detonation hydrodynamical model, then sensitivity radiation gas on modelling assumptions. The correct computation SN is not exclusively a solution an `opacity problem', characterized by treatment large number lines. demonstrate that key identify treat important atomic processes consistently. This limited treating line blanketing in non-LTE. show including forbidden-line transitions metals, particular Co, increasingly for temperature ionization beyond maximum light. Non-thermal excitation are also critical since they affect colour evolution Delta M-15 decline rate our model. While impacting little bolometric luminosity, more complete decay routes leads enhanced blanketing, e.g. associated with Ti-48 U B bands. Overall, find influenced complicated way data employ, so obtaining converged results real challenge. Nonetheless, fully fledged cmfgen obtain good agreement golden standard 2005cf optical near-IR, from 5 60 d after explosion, suggesting assuming spherical symmetry detrimental at these times. Multi-D effects no doubt matter, but perhaps less accurately non-LTE crucial reliable structures.