Kepler KOI-3738 (KIC-5478083) 2-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-3738.01 showed (Figure below) a periodicity (P_ttv) of 462.07 ± 40.65 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a xxxxhigh,medium,lowxxxx-credibility periodicity of 456.82 days.  Potentially, one other non-transiting planet is gravitationally interacting with KOI-3738.01 in this stellar system.

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TTVs are derived from Q10-Q17, the only recorded Kepler data available for this system.
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-3738.01, P = 15.85 days [Plot avg. error bars = ± 2.44 min.]
TTV_minimum: 1051.44 ± 140.24 days, Amp_ttv_minimum: -2.22 ± 0.62 min.
TTV_maximum: 1282.48 ± 154.40 days, Amp_ttv_maximum: 2.16 ± 0.62 min.
P_ttv: 462.07 ± 40.65 days.
Amp_ttv: 4.38 ± 0.88 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 456.82 days; Power: 6.62; FAP: 0.00868.
Linear ephemeris (this work): Tc = [15.85231617 ± 0.00002500](Tc#) + [75.52418975 ± 0.00177854]


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

30 May 2015