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-473.01, P = 12.71 days [Plot avg. error bars = ± 4.39 min.]
TTV_minimum: 280.26 ± 31.49 days, Amp_ttv_minimum: -20.36 ± 3.29 min.
TTV_maximum: 717.75 ± 39.29 days, Amp_ttv_maximum: 29.37 ± 3.29 min.
TTV_minimum: 1155.24 ± 50.80 days, Amp_ttv_minimum: -20.36 ± 3.29 min.
P_ttv: 874.98 ± 31.12 days.
Amp_ttv: 49.73 ± 4.66 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 860.18 days; Power: 20.55; FAP: 9.853 x 10^-7.
Linear ephemeris (this work): Tc = [12.70639574 ± 0.00005546](Tc#) + [113.63269037 ± 0.00332372]


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

21 May 2015
                 Kepler KOI-473 (KIC-10155434) 2-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-473.01 showed (Figure below) a periodicity (P_ttv) of 874.98 ± 31.12 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 860.18 days.  Potentially, one other non-transiting planet is gravitationally interacting with KOI-473.01 in this system.

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