TTVs are derived from Q1-Q17 Kepler data. x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Normalized PDCSAP_FLUX Kepler light flux vs. time (BJD_tdb - 2454900) data. y-axes: “(O – C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.
Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.
28 May 2015
Kepler KOI-1432 (Kepler-299, KIC-11014932) 5-(or more?)-Planet System
Discussion: A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-1432.04 (Kepler-299e) showed (Figure below) a periodicity (P_ttv) of 504.19 ± 20.12 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 494.37 days. Potentially, one other (a 5th), as yet unseen, non-transiting planet is gravitationally interacting with KOI-1432.04 in this stellar system. It appears that no (or very minor) TTVs are associated with the other three transiting planets in this system.