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               Kepler KOI-1081 (KIC-10149023) 2-(or more?)-Planet System

Discussion:
A sinusoidal curve-fit of the [(O-C) vs. Time] data for KOI-1081.01 showed (Figure below) a periodicity (P_ttv) of 911.88 ± 23.32 days; a Lomb-Scargle Periodogram (LSP) of the same data gave a high-credibility periodicity of 903.78 days.  Potentially, one other non-transiting planet is gravitationally interacting with KOI-1081.01 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-1081.01, P = 9.96 days [Plot avg. error bars = ± 8.41 min. (smaller than symbols)]
TTV_maximum: 345.34 ± 21.51 days, Amp_ttv_maximum: 58.22 ± 5.81 min.
TTV_minimum: 801.28 ± 28.37 days, Amp_ttv_minimum: -69.18 ± 5.81 min.
TTV_maximum: 1257.22 ± 37.66 days, Amp_ttv_maximum: 58.22 ± 5.81 min.
P_ttv: 911.88 ± 23.31 days.
Amp_ttv: 127.39 ± 8.22 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 903.78 days; Power: 33.35; FAP: 3.630 x 10^-12.
Linear ephemeris (this work): Tc = [9.95589489 ± 0.00010051](Tc#) + [67.30930771 ± 0.00702181]


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

26 May 2015

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