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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-1547.01, P = 30.69 days [Plot error bars = ± 0.806 min.]
TTV_maximum: 479.06 ± 54.60 days, Amp_ttv_maximum: 0.91 ± 0.32 min.
TTV_minimum: 737.30 ± 61.49 days, Amp_ttv_minimum: -0.90 ± 0.32 min.
TTV_maximum: 995.53 ± 70.15 days, Amp_ttv_maximum: 0.91 ± 0.32 min.
TTV_minimum: 1253.77 ± 80.01 days, Amp_ttv_minimum: -0.90 ± 0.32 min.
P_ttv: 516.47 ± 26.07 days.
Amp_ttv: 1.81 ± 0.45 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 513.51 days; Power: 4.45; P-value: 0.146.
Linear ephemeris (this work): Tc = 30.69395119(Tc#) + 298.66581876

References:
• For Q0-6 TTV data of 1547.01 (thru ~ 563 (BJD-2454900) days), see: Ford et al., 2012, arXiv-1201.1892.
• For Q0-12 TTV data of 1547.01 (thru ~ 1116 (BJD-2454900) days), see: Mazeh et al., 2013, arXiv-1301.5499.

16 Nov 2013
Kepler KOI-1547 (KIC-5283458) 2-(or more?)-Planet System