The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7

Details The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7 The Discovery of Ellipsoidal Variations in the Kepler Light Curve of HAT-P-7

2010-01-03

arxiv.org/abs/1001.0413v2

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

8 pages, 3 figures, 1 table; Accepted by ApJL on 2010 Feb 4. Revision contains minor corrections and updates to references, af

Scientific paper

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.

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