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Kepler KOI-89 (KIC-8056665) 4-(or more?)-Planet System

Two planets...two unrelated P_ttv's;
i.e.: at least 4 planets in this system (2 unseen to date).
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-89.02, P = 207.60 days [Plot avg. error bars = ± 2.60 min., smaller than data symbols.]
TTV_maximum: 570.72 ± 161.51 days, Amp_ttv_maximum: 34.70 ± 18.05 min.
TTV_minimum: 1091.24 ± 205.03 days, Amp_ttv_minimum: -32.12 ± 18.05 min.
P_ttv: 1041.03 ± 141.37 days.
Amp_ttv: 66.82 ± 25.53 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 1035.05 days; Power: 1.92; FAP: 0.3025.
Linear ephemeris (this work): Tc = 207.58340354(Tc#) + 222.88420939


Figure: KOI-89.01, P = 84.69 days [Plot avg. error bars = ± 3.10 min.]
TTV_maximum: 157.19 ± 48.77 days, Amp_ttv_maximum: 9.64 ± 3.04 min.
TTV_minimum: 426.58 ± 53.27 days, Amp_ttv_minimum: -9.16 ± 3.04 min.
TTV_maximum: 695.97 ± 61.00 days, Amp_ttv_maximum: 9.64 ± 3.04 min.
TTV_minimum: 965.36 ± 70.91 days, Amp_ttv_minimum: -9.16 ± 3.04 min.
TTV_maximum: 1234.75 ± 82.22 days, Amp_ttv_maximum: 9.64 ± 3.04 min.
TTV_minimum: 1504.14 ± 94.42 days, Amp_ttv_minimum: -9.16 ± 3.04 min.
P_ttv: 538.78 ± 29.12 days.
Amp_ttv: 18.80 ± 4.29 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 543.10 days; Power: 4.13; FAP: 0.0326.
Linear ephemeris (this work): Tc = 84.68766758(Tc#) + 83.57221868


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

12 Sep 2014