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Exoplanet-Science.com

TTVs are derived from Q1-Q16 Kepler data.  x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Kepler light flux vs. time data.  y-axes: “(O – C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.

Discussion:
The observed sinusoidal TTV suggests the presence of another unseen (non-transiting) exoplanet in this system.


KOI-2931.01, P = 99.25 days [Plot error bars = ± 10.98 min.]
TTV_maximum: 193.18 ± 165.68 days, Amp_ttv_maximum: 28.00 ± 11.40 min.
TTV_minimum: 816.97 ± 225.92 days, Amp_ttv_minimum: -36.24 ± 11.40 min.
TTV_maximum: 1440.75 ± 322.12 days, Amp_ttv_maximum: 28.00 ± 11.40 min.
P_ttv: 1247.57 ± 241.39 days.
Amp_ttv: 64.24 ± 16.12 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 1366.12 days; Power: 3.87; P-value: 0.0542.
Linear ephemeris (this work): Tc = 99.25322334(Tc#) + 81.53321047


17 Oct 2013
Kepler KOI-2931.01 (KIC-8611257) 2-(or more?)-Planet System