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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-3527.01, P = 76.82 days [Plot avg. error bars = ± 0.13 min.]
TTV_maximum: 264.80 ± 33.64 days, Amp_ttv_maximum: 0.67 ± 0.17 min.
TTV_minimum: 546.25 ± 37.58 days, Amp_ttv_minimum: -0.82 ± 0.17 min.
TTV_maximum: 827.69 ± 43.45 days, Amp_ttv_maximum: 0.67 ± 0.17 min.
TTV_minimum: 1109.14 ± 50.59 days, Amp_ttv_minimum: -0.82 ± 0.17 min.
TTV_maximum: 1390.59 ± 58.52 days, Amp_ttv_maximum: 0.67 ± 0.17 min.
P_ttv: 562.90 ± 19.75 days.
Amp_ttv: 1.49 ± 0.24 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 564.47 days; Power: 5.06; FAP: 0.00315.
Linear ephemeris (this work): Tc = [76.81983204 ± 0.00002090](Tc#) + [121.12747057 ± 0.00021713]


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

12 Dec 2014
                Kepler KOI-3527 (KIC-8733497) 2-(or more?)-Planet System

TTV Evidence:
The presence of both a credible periodicity in the Lomb-Scargle Periodogram (LSP) and a corresponding pronounced one (P_ttv) in a sinusoidal distribution of [(O-C) vs. Time] ("TTVxy") data points is strongly suggestive of the presence of a second (possibly unseen, non-transiting) gravitationally-perturbing planetary object in a system.  This is the case for KOI-3527.01.