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Samples of young type Ia supernovae have shown `early excess' emission in afew cases. Similar excesses are predicted by some explosion and progenitorscenarios and hence can provide important clues regarding the origin ofthermonuclear supernovae. They are however, only predicted to last up to thefirst few days following explosion. It is therefore unclear whether suchscenarios are intrinsically rare or if the relatively small sample size simplyreflects the difficulty in obtaining sufficiently early detections. To thatend, we perform toy simulations covering a range of survey depths and cadences,and investigate the efficiency with which young type Ia supernovae arerecovered. As input for our simulations, we use models that broadly cover therange of predicted luminosities. Based on our simulations, we find that in atypical three day cadence survey, only $\sim$10% of type Ia supernovae would bedetected early enough to rule out the presence of an excess. A two day cadencehowever, should see this increase to $\sim$15%. We find comparable results frommore detailed simulations of the Zwicky Transient Facility surveys. Using therecovery efficiencies from these detailed simulations, we investigate thenumber of young type Ia supernovae expected to be discovered assuming somefraction of the population come from scenarios producing an excess at earlytimes. Comparing the results of our simulations to observations, we find theintrinsic fraction of type Ia supernovae with early flux excesses is$\sim28^{+13}_{-11}%$%.

The detection efficiency of type Ia supernovae from the Zwicky Transient Facility: Limits on the intrinsic rate of early flux excesses