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It has recently been proposed that gravitationally lensed type-Ia supernovaecan provide microlensing-free time-delay measurements provided that themeasurement is taken during the achromatic expansion phase of the explosion andthat color light curves are used rather than single-band light curves. Ifverified, this would provide both precise and accurate time-delay measurements,making lensed type-Ia supernovae a new golden standard for time-delaycosmography. However, the 3D geometry of the expanding shell can introduce anadditional bias that has not yet been fully explored. In this work, we presentand discuss the impact of this effect on time-delay cosmography with lensedsupernovae and find that on average it leads to a bias of a few tenths of a dayfor individual lensed systems. This is negligible in view of the cosmologicaltime delays predicted for typical lensed type-Ia supernovae but not for thespecific case of the recently discovered type-Ia supernova iPTF16geu, whosetime delays are expected to be smaller than a day.

Impact of the 3D source geometry on time-delay measurements of lensed type-Ia Supernovae