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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 for KOI-2194.02 suggests the presence of another unseen (non-transiting) exoplanet in this system.


1st: KOI-2194.01, P = 34.76 days [Plot error bars = ± 8.47 min.]
Linear ephemeris (this work): Tc = 34.76309543(Tc#) + 94.74289145

2nd: KOI-2194.02, P = 67.97 days [Plot error bars = ± 9.15 min.]

TTV_maximum: 289.19 ± 72.46 days, Amp_ttv_maximum: 20.88 ± 7.08 min.
TTV_minimum: 701.17 ± 87.56 days, Amp_ttv_minimum: -25.54 ± 7.08 min.
TTV_maximum: 1113.14 ± 109.97 days, Amp_ttv_maximum: 20.88 ± 7.08 min.
P_ttv: 823.95 ± 63.41 days.
Amp_ttv: 46.42 ± 10.01 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 809.93 days; Power: 4.82; P-value: 0.0146.
Linear ephemeris (this work): Tc = 67.96769702(Tc#) + 96.57317471


References:
• For Q0-Q6 TTV data of 2194.01 (thru ~ 563 (BJD-2454900) days), see: Ford et al., 2012, arXiv-1201.1892.
• For Q0-12 TTV data of 2194.01 (thru ~ 1116 (BJD-2454900) days), see: Mazeh et al., 2013, arXiv-1301.5499.

2 Jan 2014
KOI-2194 (Kepler-371, KIC-3548044) 2-(or more?)-Planets