Modern photometric transit surveys such as K2, TESS, NGTS and PLATO now have the precision to identify exoplanets from only a single transit. This will allow the detection of planets down to super-Earth radii on periods much longer than the campaign duration. Provided the host star can be characterised, the information contained within a single transit can also be used to estimate a circular orbital period, which is demonstrable with known Kepler planets. Such objects could therefore allow orbital and atmospheric follow-up of a new range of cool exoplanets.

I will present the results of a search for single transits in the first seven K2 fields which includes more than a dozen potential planet candidates from super-Earth to Jupiter radii around 9th to 13th magnitude stars. I will also provide orbital period estimates for these objects and detail results from an ongoing follow-up campaign.

Finally, I will address the capability of future transit surveys to detect single transits and show how these objects can improve the NGTS and TESS planet yields by as much as 15%, and how PLATO will provide single-transit period estimates with 10% precision for cool planets down to super-Earth size.