SIMBAD references

2013ApJ...764L..22M - Astrophys. J., 764, L22 (2013/February-3)

Kepler's optical secondary eclipse of HAT-P-7b and probable detection of planet-induced stellar gravity darkening.

MORRIS B.M., MANDELL A.M. and DEMING D.

Abstract (from CDS):

We present observations spanning 355 orbital phases of HAT-P-7 observed by Kepler from 2009 May to 2011 March (Q1-9). We find a shallower secondary eclipse depth than initially announced, consistent with a low optical albedo and detection of nearly exclusively thermal emission, without a reflected light component. We find an approximately 10 ppm perturbation to the average transit light curve near phase -0.02 that we attribute to a temperature decrease on the surface of the star, phased to the orbit of the planet. This cooler spot is consistent with planet-induced gravity darkening, slightly lagging the sub-planet position due to the finite response time of the stellar atmosphere. The brightness temperature of HAT-P-7b in the Kepler bandpass is TB= 2733 ±21 K and the amplitude of the deviation in stellar surface temperature due to gravity darkening is approximately -0.18 K. The detection of the spot is not statistically unequivocal due its small amplitude, though additional Kepler observations should be able to verify the astrophysical nature of the anomaly.

Abstract Copyright:

Journal keyword(s): eclipses - planets and satellites: fundamental parameters - planets and satellites: individual: HAT-P-7b - stars: atmospheres - stars: individual: HAT-P-7

Simbad objects: 5

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