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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-456.01, P = 13.70 days [Plot avg. error bars = ± 3.64 min.]
TTV_maximum: 357.06 ± 17.73 days, Amp_ttv_maximum: 17.92 ± 1.59 min.
TTV_minimum: 793.43 ± 21.98 days, Amp_ttv_minimum: -23.44 ± 1.59 min.
TTV_maximum: 1229.79 ± 27.92 days, Amp_ttv_maximum: 17.92 ± 1.59 min.
P_ttv: 872.73 ± 15.99 days.
Amp_ttv: 41.36 ± 2.24 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 855.24 days; Power: 32.55; FAP: 6.741 x 10^-12.
Linear ephemeris (this work): Tc = [13.69942749 ± 0.00003939](Tc#) + [104.48011847 ± 0.00229358]


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

21 May 2015
         Kepler KOI-456 (Kepler-160; KIC-7269974) 3-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-456.01 (Kepler-160c) showed (Figure below) a periodicity (P_ttv) of 872.73 ± 15.99 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 855.24 days.  Potentially, a non-transiting planet is gravitationally interacting with KOI-456.01 in this stellar system other than KOI-456.02.