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TTVs are derived from Q0-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-620.01, P = 45.16 days [Plot avg. error bars = ± 1.67 min.]
TTV_minimum: 389.11 ± 24.23 days, Amp_ttv_minimum: -6.80 ± 0.87 min.
TTV_maximum: 788.88 ± 30.07 days, Amp_ttv_maximum: 8.61 ± 0.87 min.
TTV_minimum: 1188.65 ± 37.91 days, Amp_ttv_minimum: -6.80 ± 0.87 min.
P_ttv: 799.54 ± 20.75 days.
Amp_ttv: 15.41 ± 1.23 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 791.73 days; Power: 11.23; FAP: 1.068 x 10^-8.
Linear ephemeris (this work): Tc = 45.15529054(Tc#) + 92.10860020

Figure: KOI-620.03, P = 85.31 days [Plot avg. error bars = ± 5.08 min.]
TTV_maximum: 254.59 ± 138.37 days, Amp_ttv_maximum: 10.78 ± 5.59 min.
TTV_minimum: 824.59 ± 182.05 days, Amp_ttv_minimum: -18.75 ± 5.59 min.
TTV_maximum: 1394.59 ± 248.85 days, Amp_ttv_maximum: 10.78 ± 5.59 min.
P_ttv: 1140.00 ± 171.97 days.
Amp_ttv: 29.54 ± 7.90 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 1359.99 days; Power: 3.25; FAP: 0.163.
Linear ephemeris (this work): Tc = 85.31654586(Tc#) + 228.31458639

Figure: KOI-620.02, P = 130.18 days [Plot avg. error bars = ± 1.41 min.]
TTV_maximum: 712.08 ± 237.77 days, Amp_ttv_maximum: 13.35 ± 4.20 min.
P_ttv: 1335.11 ± 314.63 days.
Amp_ttv: 24.72 ± 5.94 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 1436.47 days; Power: 3.56; FAP: 0.00662.
Linear ephemeris (this work): Tc = 130.17811096(Tc#) + 145.03534185

For literature references, including Tc#, Tc, and major TTV tabulations, see my "Summary" webpage.

24 July 2014
KOI-620 (Kepler-51, KIC-11773022) System