A Bayesian Analysis Of Kepler-2b Using The EXONEST Algorithm

21/09/2014
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Publication MaxEnt 2014
OAI : oai:www.see.asso.fr:9603:11337
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A Bayesian Analysis Of Kepler-2b Using The EXONEST Algorithm

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A Bayesian Analysis of Kepler-2b Using The EXONEST Algorithm Ben Placek1 and Kevin H. Knuth1,2 1 Department of Physics 2 Department of Informatics University at Albany (SUNY), Albany NY, USA bplacek@albany.edu kknuth@albany.edu Abstract The study of exoplanets (planets orbiting other stars) is revolutionizing the way we view our universe. High-precision photometric data provided by the Kepler Space Telescope (Kepler) enables not only the detection of such planets, but also their characterization. This presents a unique opportunity to apply Bayesian methods to better characterize the multitude of previously confirmed exoplanets. This pa- per focuses on applying the EXONEST algorithm to characterize the transiting short-period-hot-Jupiter, Kepler-2b. EXONEST evaluates a suite of exoplanet pho- tometric models by applying Bayesian Model Selection, which is implemented with the MultiNest algorithm. These models take into account planetary effects, such as reflected light and thermal emissions, as well as the effect of the planetary motion on the host star, such as Doppler beaming, or boosting, of light from the reflex motion of the host star, and photometric variations due to the planet-induced ellipsoidal shape of the host star. By calculating model evidences, one can determine which model best describes the observed data, thus identifying which effects dominate the planetary system. Presented are parameter estimates and model evidences for Kepler-2b. Key Words: Exoplanets, Model Selection, Kepler-2b