Scroll Down  to

KOI's (Blue)  or
K2 Objects (Green)

Exoplanet-Science.com

Kepler KOI-84 (Kepler-19, KIC-2571238) 2-(or more?)-Planet System

TTV Evidence for two confirmed planets in this system (see NASA Exoplanet Archives):
Transiting: KOI-84.01, Kepler-19b;
Non-Transiting: KOI-84.02, Kepler-19c.

The presence of both a credible periodicity in the Lomb-Scargle Periodogram (LSP) of [(O-C) vs. Time] ("TTVxy") data points along with a sinusoidal distribution of the same points displaying a corresponding periodicity ("P_ttv") (see Figure below) is tabulated below the following TTV figure.
TTVs are derived from Short-Cadence Q3-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-84.01, P = 9.29 days [Plot avg. error bars = ± 1.01 min.]
TTV_maximum: 309.60 ± 9.37 days, Amp_ttv_maximum: 4.56 ± 0.43 min.
TTV_minimum: 467.33 ± 10.00 days, Amp_ttv_minimum: -4.84 ± 0.43 min.
TTV_maximum: 625.06 ± 10.83 days, Amp_ttv_maximum: 4.56 ± 0.43 min.
TTV_minimum: 782.79 ± 11.81 days, Amp_ttv_minimum: -4.84 ± 0.43 min.
TTV_maximum: 940.52 ± 12.91 days, Amp_ttv_maximum: 4.56 ± 0.43 min.
TTV_minimum: 1098.25 ± 14.10 days, Amp_ttv_minimum: -4.84 ± 0.43 min.
TTV_maximum: 1255.99 ± 15.37 days, Amp_ttv_maximum: 4.56 ± 0.43 min.
TTV_minimum: 1413.72 ± 16.68 days, Amp_ttv_minimum: -4.84 ± 0.43 min.
P_ttv: 315.46 ± 3.16 days.
Amp_ttv: 9.39 ± 0.61 minutes.
Lomb-Scargle periodogram, periodicity (P_ttv): 315.06 days; Power: 35.74; FAP: 3.964 x 10^-13.
Linear ephemeris (this work): Tc = [9.28697334 ± 0.00000709](Tc#) + [68.99503145 ± 0.00062119]

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

17 Nov 2014