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-5088.01, P = 49.18 days [Plot avg. error bars = ± 18.50 min.]
TTV_maximum: 258.27 ± 11.70 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 355.59 ± 12.05 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 452.92 ± 12.49 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 550.24 ± 13.03 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 647.56 ± 13.63 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 744.89 ± 14.31 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 842.21 ± 15.04 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 939.53 ± 15.82 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 1036.86 ± 16.65 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 1134.18 ± 17.51 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 1231.51 ± 18.40 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
TTV_minimum: 1328.83 ± 19.32 days, Amp_ttv_minimum: -58.32 ± 12.30 min.
TTV_maximum: 1426.15 ± 20.26 days, Amp_ttv_maximum: 49.71 ± 12.30 min.
P_ttv: 194.65 ± 2.30 days.
Amp_ttv: 108.03 ± 17.39 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 194.94 days; Power: 5.56; FAP: 0.00451.
Linear ephemeris (this work): Tc = [49.17735507 ± 0.00087474](Tc#) + [98.78297861 ± 0.01572228]


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

23 May 2015

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                 Kepler KOI-5088 (KIC-4813750) 2-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-5088.01 showed (Figure below) a periodicity (P_ttv) of 194.65 ± 2.30 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 194.94 days.  Potentially, one other non-transiting planet is gravitationally interacting with KOI-5088.01 in this stellar system.