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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-5753.01, P = 70.52 days [Plot avg. error bars = ± 0.084 min.]
TTV_minimum: 165.76 ± 22.76 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
TTV_maximum: 294.40 ± 23.65 days, Amp_ttv_maximum: 0.154 ± 0.05 min.
TTV_minimum: 423.03 ± 24.97 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
TTV_maximum: 551.67 ± 26.66 days, Amp_ttv_maximum: 0.154 ± 0.05 min.
TTV_minimum: 680.30 ± 28.66 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
TTV_maximum: 808.94 ± 30.91 days, Amp_ttv_maximum: 0.154 ± 0.05 min.
TTV_minimum: 937.58 ± 33.35 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
TTV_maximum: 1066.21 ± 35.94 days, Amp_ttv_maximum: 0.154 ± 0.05 min.
TTV_minimum: 1194.85 ± 38.66 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
TTV_maximum: 1323.48 ± 41.48 days, Amp_ttv_maximum: 0.154 ± 0.05 min.
TTV_minimum: 1452.12 ± 44.38 days, Amp_ttv_minimum: -0.153 ± 0.05 min.
P_ttv: 257.27 ± 6.80 days.
Amp_ttv: 0.31 ± 0.07 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 257.48 days; Power: 4.52; FAP: 0.0487.
Linear ephemeris (this work): Tc = [70.51623093 ± 0.00000440](Tc#) + [75.85813418 ± 0.00004931]


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

29 April 2015
               Kepler KOI-5753 (KIC-10006096) 2-(or more?)-Planet System

Discussion:
In the example of KOI-5753.01, a sinusoidal curve-fit of the (O-C) vs. Time data showed (Figure below) a periodicity (P_ttv) of 257.27 ± 6.80 days; 257.48 days was observed in the Lomb-Scargle Periodogram (LSP) of the same data.  The amplitude (Amp_ttv), which was quite small, still seems credible since the EXOFAST evaluations of the unusually large transits yielded relatively small errors.