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                 Kepler KOI-5483 (KIC-8179747) 2-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-5483.01 showed (Figure below) a periodicity (P_ttv) of 1617.83 ± 535.60 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a medium-credibility periodicity of 1537.52 days.  Potentially, one other non-transiting planet is gravitationally interacting with KOI-5483.01 in this stellar system.

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-5483.01, P = 17.95 days [Plot avg. error bars = ± 0.247 min.]
TTV_maximum: 786.94 ± 370.90 days; Amp_ttv_maximum: 0.41 ± 0.23 min.
P_ttv: 1617.83 ± 535.60 days.
Amp_ttv: 0.90 ± 0.32 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 1537.52 days; Power: 10.02; FAP: 0.0316.
Linear ephemeris (this work): Tc = [17.94632696 ± 0.00000194](Tc#) + [69.94820640 ± 0.00009106]


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

21 May 2015