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KOI's (Blue)  or
K2 Objects (Green)

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.

This object, KOI-134.01, is currently listed in the NASA Exoplanet Archive as a False Positive but some feel this is not conclusive and that it should still be considered a possible exoplanet candidate (see comments within the CFOP reference below).  Regardless of how it is ultimately characterized, it appears to be under the strong influence of another object that gives rise to the very large TTV (average maximum amplitude of ± 15.7 hours) that is observed.   Note the close agreement between the results of the sinusoidal curve-fit (P_ttv = 1045.21 days) and that of the Lomb-Scargle periodogram (P_ttv = 1036.99 days).

KOI-134.01, P = 67.40 days [Plot error bars (smaller than symbol) = ± 1.52 min.]
TTV_minimum: 518.25 ± 21.20 days, Amp_ttv_minimum: -889.34 ± 71.28 min.
TTV_maximum: 1040.85 ± 28.64 days, Amp_ttv_maximum: 999.32 ± 71.28 min.
P_ttv: 1045.21 ± 22.30 days.
Amp_ttv: 1888.66 ± 100.81 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 1036.99 days; Power: 8.00; P-value: 7.59 x 10^-9.
Linear ephemeris (this work): Tc = 67.53661865(Tc#) + 85.37473592

• Kepler Community Follow-up Observing Program (CFOP):; see Observing Notes for KOI #134.

21 Aug 2013
Kepler KOI-134 (KIC-9032900) 1-(or more?)-Planet System