Exoplanet-Science.com

Kepler KOI-2830 (KIC-9244508) 1-(& more?)-Planet System

Scroll Down  to

KOI's (Blue)  or
K2 Objects (Green)
TTVs are derived from Q1-Q15 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.

Discussion:
The TTV plot strongly suggests the presence of at least one more non-transiting exoplanet in this star system.  Note the particularly close agreement between the P_ttv (from the best-fit sinusoidal curve) and the major Lomb-Scargle periodogram peak: 958.90 vs. 972.76 days.

1st: KOI-2830.01, P = 40.53 days
TTV_maximum: 585.41 ± 130.49 days, Amp_ttv_maximum: 53.23 ± 21.99 min.
TTV_minimum: 1064.86 ± 168.28 days, Amp_ttv_minimum: -54.06 ± 21.99 min.
P_ttv: 958.90 ± 114.55 days.
Amp_ttv: 107.29 ± 31.10 minutes.
Lomb-Scargle periodogram, candidate P_ttv: 972.76 days; Power: 3.83; P-value: 0.247.
Linear ephemeris: Tc = 40.52906891(Tc#) + 101.02958513 [this work].


18 June 2013; updated 9 Aug 2013