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KOI's (Blue)  or
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Exoplanet-Science.com

TTVs are derived from Q0-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-868.01, P = 236.0 days [Plot avg. error bars = ± 0.91 min., smaller than symbols]
TTV_minimum: 611.11 ± 61.97 days, Amp_ttv_minimum: -41.77 ± 6.14 min.
TTV_maximum: 1107.54 ± 80.41 days, Amp_ttv_maximum: 29.45 ± 6.14 min.
P_ttv: 992.84 ± 55.08 days.
Amp_ttv: 71.22 ± 8.68 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 1001.68 days; Power: 2.27; FAP: 0.0544.
Linear ephemeris (this work): Tc = 235.99720720(Tc#) + 141.41480633

For literature references, including Tc#, Tc, and major TTV tabulations, see my "Summary" webpage.

27 Sep 2014
Kepler KOI-868 (KIC-6867155) 2-(or more?)-Planet System