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Exoplanet-Science.com

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-3528.01, P = 165.41 days [Plot avg. error bars = ± 0.14 min.]
TTV_minimum: 76.00 ± 36.79 days, Amp_ttv_minimum: -0.75 ± 0.21 min.
TTV_maximum: 323.60 ± 38.80 days, Amp_ttv_maximum: 0.85 ± 0.21 min.
TTV_minimum: 571.20 ± 42.95 days, Amp_ttv_minimum: -0.75 ± 0.21 min.
TTV_maximum: 818.80 ± 48.70 days, Amp_ttv_maximum: 0.85 ± 0.21 min.
TTV_minimum: 1066.40 ± 55.57 days, Amp_ttv_minimum: -0.75 ± 0.21 min.
TTV_maximum: 1314.00 ± 63.17 days, Amp_ttv_maximum: 0.85 ± 0.21 min.
P_ttv: 495.20 ± 19.39 days.
Amp_ttv: 1.59 ± 0.30 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 495.43 days; Power: 2.958; FAP: 0.0188.
Linear ephemeris (this work): Tc = [165.40578042 ± 0.00006484](Tc#) + [74.58016446 ± 0.00031430]


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

4 Dec 2014
                Kepler KOI-3528 (KIC-4255422) 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-3528.01.