TTVs are derived from Q1-Q17 Kepler data.  x-axes: “Observed Tc” (Mid-Transit Time): EXOFAST’s best-fits from Normalized PDCSAP_FLUX Kepler light flux vs. time (BJD_tdb - 2454900) data.  y-axes: “(O-C)”: difference between Observed Tc and the Calculated Tc from the graphically obtained linear ephemeris.

Figure: KOI-398.01, P = 51.85 days [Plot avg. error bars = ± 1.42 min.]
TTV_maximum: 123.99 ± 20.86 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 228.00 ± 21.37 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 332.00 ± 22.16 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 436.01 ± 23.19 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 540.01 ± 24.45 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 644.01 ± 25.88 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 748.02 ± 27.48 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 852.02 ± 29.20 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 956.03 ± 31.04 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 1060.03 ± 32.96 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 1164.03 ± 34.96 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
TTV_minimum: 1268.04 ± 37.03 days, Amp_ttv_minimum: -1.89 ± 0.66 min.
TTV_maximum: 1372.04 ± 39.14 days, Amp_ttv_maximum: 1.90 ± 0.66 min.
P_ttv: 208.01 ± 5.04 days.
Amp_ttv: 3.79 ± 0.94 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 208.44 days; Power: 4.49; FAP: 0.0746.
Linear ephemeris (this work): Tc = [51.846876 ± 0.000042](Tc#) + [103.083205 ± 0.000613]


References:
• Numerous literature and major Tc#, Tc, and TTV tabulation references can be found on my "Summary" webpage following the table.

9 Feb 2015
Kepler KOI-398.01 (KIC-9946525) 4-(or more?)-Planet System

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