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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.

Figure: KOI-4636.01, P = 122.75 days [Plot avg. error bars = ± 9.58 min.]
TTV_minimum: 840.95 ± 167.95 days, Amp_ttv_minimum: -45.81 ± 19.95 min.
TTV_maximum: 1178.08 ± 197.12 days, Amp_ttv_maximum: 48.85 ± 19.95 min.
P_ttv: 674.25 ± 84.33 days.
Amp_ttv: 94.66 ± 28.22 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 668.64 days; Power: 2.41; FAP: 0.105.
Linear ephemeris (this work): Tc = [122.73954045 ± 0.00488943](Tc#) + [104.08456511 ± 0.03834385]


Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.

14 April 2015
                  Kepler KOI-4636 (KIC-9773270) 2-(or more?)-Planet System

Discussion:
In the example of the transiting planet, KOI-4636.01, after a sinusoidal curve-fit of the (O-C) vs. Time data showed (Figure 1.) a periodicity (P_ttv) of 674.25 ± 84.33 days (668.64 days was observed in the Lomb-Scargle Periodogram (LSP) of the same data).