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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.  The plots are pictured in the order of orbital periods.

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


KOI-2975.01, P = 175.32 days [Plot error bars = ± 9.52 min.]
TTV_minimum: 611.42 ± 93.81 days, Amp_ttv_minimum: -38.17 ± 12.03 min.
TTV_maximum: 1031.12 ± 118.47 days, Amp_ttv_maximum: 44.37 ± 12.03 min.
P_ttv: 839.42 ± 73.15 days.
Amp_ttv: 82.54 ± 17.01 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 834.28 days; Power: 2.55; P-value: 0.0437.
Linear ephemeris (this work): Tc = 175.32474596(Tc#) + 163.95521100


21 Oct 2013
Kepler KOI-2975.01 (KIC-12416987) 2-(or more?)-Planet System