Analysis Of Kepler Observations Of HAT-P-7 b

Details Analysis Of Kepler Observations Of HAT-P-7 b Analysis Of Kepler Observations Of HAT-P-7 b

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0306j&link_type=abstract

American Astronomical Society, ESS meeting #2, #3.06

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Scientific paper

HAT-P-7 b is among the hottest hot Jupiters ever discovered. Its orbital distance of about 4 stellar radii from an F star suggests the planet has a dayside temperature in excess of 2700 K. Moreover, HAT-P-7 b exerts tremendous tidal influence on its host star, significantly distorting the star's equilibrium shape. Prompted in part by these expectations, the Kepler mission observed the HAT-P-7 system in its short-cadence mode (i.e. 60 second integration times) from May 2009 till December 2010. Early analyses of a subset of these data have revealed the unique phenomena exhibited by this system. Borucki et al. (2009) analyzed the first ten days of observations (quarter 0) and identified atmospheric emission from the planet, suggesting a dayside temperature of 2650 K and little day-to-nightside redistribution of stellar heating. Welsh et al. (2010) followed with an analysis of 34 days of observations (quarter 1) and found an increase in flux from the system as the planet passed through quadrature. These oscillations are consistent with variations in the host star's projected surface area resulting from its tidal distortion (ellipsoidal variations). Since those analyses, another 90 days (quarter 2) of Kepler data have been made public, nearly tripling the number of planetary transits observed. This increase in the number of transits allows more complete removal of other systematic variations, facilitating a search for planetary variability. In this presentation, we will discuss our analysis of the publicly available Kepler transit data of HAT-P-7 b. We will present improved constraints on transit parameters and the ellipsoidal variations exhibited by the host star. We will also discuss our search for changes from one orbit to the next in the planet's phase curve, indicative of meteorological variability.
Jackson was funded through the NASA Postdoctoral Program (NPP).

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