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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-5117.01, P = 33.37 days [Plot avg. error bars = ± 17.42 min.]
TTV_maximum: 246.21 ± 37.30 days, Amp_ttv_maximum: 39.61 ± 15.55 min.
TTV_minimum: 465.65 ± 40.79 days, Amp_ttv_minimum: -52.77 ± 15.55 min.
TTV_maximum: 685.08 ± 45.89 days, Amp_ttv_maximum: 39.61 ± 15.55 min.
TTV_minimum: 904.52 ± 52.11 days, Amp_ttv_minimum: -52.77 ± 15.55 min.
TTV_maximum: 1123.95 ± 59.11 days, Amp_ttv_maximum: 39.61 ± 15.55 min.
TTV_minimum: 1343.39 ± 66.64 days, Amp_ttv_minimum: -52.77 ± 15.55 min.
P_ttv: 438.87 ± 18.35 days.
Amp_ttv: 92.37 ± 21.99 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 445.28 days; Power: 4.67; FAP: 0.125.
Linear ephemeris (this work): Tc = [33.37193876 ± 0.00053487](Tc#) + [86.62117214 ± 0.01334805]


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

30 Nov 2014
                Kepler KOI-5117 (KIC-5027859) 2-(or more?)-Planet System

TTV Evidence:
The presence of both a credible periodicity in the Lomb-Scargle Periodogram (LSP) and a corresponding pronounced one (P_ttv) in a sinusoidal distribution of [(O-C) vs. Time] ("TTVxy") data points is strongly suggestive of the presence of a second unseen (probably non-transiting) gravitationally-perturbing planetary object in a system.  This is the case for KOI-5117.01.