So in georgeeze -- and for the sake of my fellow peanuters -- you are saying the luminosity is fixed because the half life is constant for these decaying elements, thus the dimming seen in the light curve is unaffected by the possible difference in size of the SC SN, compared with regular Type Ia supernovae.
Originally Posted by antoniseb
Yet the bigger the ball of a glowing gas, the brigher it looks (i.e. apparent magnitude). And Jerry seems to be saying that size does matter, namely that a slower expansion of the extremely bright shell will appear more dim than normal and will take longer to fade away.
I would guess, however, that the SED (spectral energy distribution) would have a lot to say about this. Perhaps the outer layers beyond Ni56 suppress the light, but this too should be quite noticeable in the SED as strong absorption lines. Sphericity also becomes important since a spherical blast will have the same apparent magnitude regardless of what side we are on. The SC SN mentioned seem to have spherical expansions (thankfully).
We know time flies, we just can't see its wings.