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 of 1871.01 suggests the presence of another unseen (non-transiting) exoplanet in this system.
1st: KOI-1871.02, P = 32.38 days [Plot error bars = ± 6.41 min.] Linear ephemeris (this work): Tc = 32.37635619(Tc#) + 83.41232325
References: • Fabrycky et al., arXiv-1201.5415; P_ttv = 1/|(nmmri_a/P_a - nmmri_b/P_b)|. • For Q0-Q6 TTV data of 1871.01 (thru ~ 563 (BJD-2454900) days), see: Ford et al., 2012, arXiv-1201.1892. • For Q0-12 TTV data of 1871.01 (thru ~ 1116 (BJD-2454900) days), see: Mazeh et al., 2013, arXiv-1301.5499.
20 Dec 2013
Kepler KOI-1871 (KIC-9758089) 3-(or more?)-Planet System