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19 April 2024

» arxiv » 1001.0413

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The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7
William F. Welsh ; Jerome A. Orosz ; Sara Seager ; Jonathan J. Fortney ; Jon Jenkins ; Jason F. Rowe ; David Koch ; William J. Borucki ;
Date:	3 Jan 2010
Abstract:	We present an analysis of the early Kepler observations of the previously discovered transiting planet HAT-P-7b. The light curve shows the transit of the star, the occultation of the planet, and the orbit phase-dependent light from the planet. In addition, phase-dependent light from the star is present, known as "ellipsoidal variations". The very nearby planet (only 4 stellar radii away) gravitationally distorts the star and results in a flux modulation twice per orbit. The ellipsoidal variations can confuse interpretation of the planetary phase curve if not self-consistently included in the modeling. We fit the light curve using the Roche potential approximation and derive improved planet and orbit parameters.
Source:	arXiv, 1001.0413
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