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The early lightcurves of Type Ia supernovae (SNe Ia) can be used to testpredictions about their progenitor systems. If the progenitor system consistsof a single white dwarf in a binary with a Roche-lobe-overflowingnon-degenerate stellar companion, then the SN ejecta should collide with thatcompanion soon after the explosion and get shock-heated, leaving an early UVexcess in the lightcurve. This excess would only be observable for events withfavorable viewing angles, $\sim$10\% of the time. We model the 2018 ZTF sampleof 127 SNe Ia using companion shocking models, and recover an observed earlyexcess rate of $12.0\pm3.6\%$, consistent both with several other ratescalculated throughout the literature, and with the expectation that SNe Iapredominantly occur in single-degenerate systems. We observe early excessesonly in spectroscopically normal SNe Ia, in contradiction to the claim thatsuch excesses occur more frequently in overluminous SNe Ia. We also show thatthe detection of early excesses can be methodology-dependent. We encourage theobservation of large samples of SNe Ia with high-cadence multiwavelength earlydata in order to test the statistical predictions of SN Ia progenitor models,and we also encourage the refinement of existing models.

Companion Shocking Fits to the 2018 ZTF Sample of SNe Ia Are Consistent with Single-Degenerate Progenitor Systems