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Exomoons are expected to produce potentially detectable transit timingvariations (TTVs) upon their parent planet. Unfortunately, distinguishingmoon-induced TTVs from other sources, in particular planet-planet interactions,has severely impeded its usefulness as a tool for identifying exomooncandidates. A key feature of exomoon TTVs is that they will always beundersampled, due to the simple fact that we can only observe the TTVs once pertransit/planetary period. We show that it is possible to analytically expressthe aliased TTV periodicity as a function of planet and moon period. Further,we show that inverting an aliased TTV period back to a true moon period isfraught with hundreds of harmonic modes. However, a unique aspect of these TTValiases is that they are predicted to occur at consistently short periods,irrespective of what model one assumes for the underlying moon population.Specifically, 50% of all exomoons are expected to induce TTVs with a periodbetween 2 to 4 cycles, a range that planet-planet interactions rarely manifestat. This provides an exciting and simple tool for quickly identifying exomoonscandidates and brings the TTV method back to the fore as an exomoon huntingstrategy. Applying this method to the candidate, Kepler-1625b i, reveals thatits TTV periodicity centers around the median period expected for exomoons.

The Exomoon Corridor: Half of all exomoons exhibit TTV frequencies within a narrow window due to aliasing