TTVs are derived from Q1-Q16 Kepler data. x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Kepler light flux vs. time data. y-axes: “(O – C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris. The plots are pictured in the order of orbital periods.
Discussion: The observed sinusoidal TTV and corresponding Lomb-Scargle periodicity for KOI-3042.01 (727.67 and 725.90 days, respectively) suggest the presence of another unseen (non-transiting) exoplanet in this system.