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The delayed-detonation explosion mechanism applied to a Chandrasekhar-masswhite dwarf offers a very attractive model to explain the inferredcharacteristics of Type Ia supernovae (SNe Ia). The resulting ejecta arechemically stratified, have the same mass and roughly the same asymptotickinetic energy, but exhibit a range in 56Ni mass. We investigate thecontemporaneous photometric and spectroscopic properties of a sequence ofdelayed-detonation models, characterized by 56Ni masses between 0.18 and 0.81Msun. Starting at 1d after explosion, we perform the full non-LTE,time-dependent radiative transfer with the code CMFGEN, with an accuratetreatment of line blanketing, and compare our results to SNe Ia at bolometricmaximum. Despite the 1D treatment, our approach delivers an excellent agreementto observations. We recover the range of SN Ia luminosities, colours, andspectral characteristics from the near-UV to 1 micron, for standard as well aslow-luminosity 91bg-like SNe Ia. Our models predict an increase in rise time topeak with increasing 56Ni mass, from ~15 to ~21d, yield peak bolometricluminosities that match Arnett's rule to within 10%, and reproduce the muchsmaller scatter in near-IR magnitudes compared to the optical. We reproduce themorphology of individual spectral features, the stiff dependence of the R(Si)spectroscopic ratio on 56Ni mass, and the onset of blanketing from TiII/ScII inlow-luminosity SNe Ia with a 56Ni mass <0.3 Msun. We find that ionizationeffects, which often dominate over abundance variations, can producehigh-velocity features in CaII lines, even in 1D. Distinguishing betweendifferent SN Ia explosion mechanisms is a considerable challenge but theresults presented here provide additional support to the viability of thedelayed-detonation model.

One-dimensional delayed-detonation models of Type Ia supernovae: Confrontation to observations at bolometric maximum