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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 at least a second (unseen, non-transiting) exoplanet in this system.


KOI-4548.01, P = 61.08 days [Plot error bars = ± 17.47 min.]
TTV_maximum: 304.70 ± 52.77 days, Amp_ttv_maximum: 110.48 ± 37.83 min.
TTV_minimum: 596.81 ± 61.83 days, Amp_ttv_minimum: -128.02 ± 37.83 min.
TTV_maximum: 888.92 ± 74.38 days, Amp_ttv_maximum: 110.48 ± 37.83 min.
TTV_minimum: 1181.03 ± 88.96 days, Amp_ttv_minimum: -128.02 ± 37.83 min.
TTV_maximum: 1473.13 ± 104.73 days, Amp_ttv_maximum: 110.48 ± 37.83 min.
P_ttv: 584.22 ± 36.67 days.
Amp_ttv: 238.50 ± 53.50 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 584.14 days; Power: 4.74; P-value: 0.0365.
Linear ephemeris (this work): Tc = 61.07974653(Tc#) + 65.51409132


25 Oct 2013
Kepler KOI-4548 (KIC-3223433) 2-(or more?)-Planet System