Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-03-08
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
Corrected error in analysis, which fortuitously clarified our conclusions; new figures, tables, improved section 5, and minor
Scientific paper
The recent announcement of 2300+ candidate transiting exoplanets (KOIs) orbiting \sim1800 host stars discovered with the Kepler mission enables a plethora of ensemble analysis of the architecture and properties of exoplanetary systems. We use the transit durations to probe the ensemble validity of stellar parameters for Kepler candidate host stars. While the new KOI stellar parameters are an improvement over the previous release, our analysis shows that a systematic trend in the ensemble stellar radii remains, which affects the KOI exoplanet radii inferred from transit depths. We also compare the distribution of observed transit durations to a model generated from the known eccentricities of radial velocity (RV) discovered exoplanets. We find that the Kepler and RV distributions differ at a statistically significant level, even after accounting for the transit probability as a function of the eccentricity, inclination, and periastron angle. Additionally, smaller radii KOIs are preferentially found on more circular orbits. Finally, there is an over-abundance of KOIs with long transit durations. We identify that errors in stellar metallicity and possibly extinction can account for these sources rather than eccentric planets improbably transiting near aphastron.
Bilinski Christopher
Currie Thayne
Plavchan Peter
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