Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2012-01-19
Astronomy Reports, 2011, Vol.55, pp.1051-1073
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
37 pages, 16 tables, 17 figures
Scientific paper
High-accuracy multicolor light curves of the binary system HD 189733, which contains an exoplanet, are analyzed. We have determined the radii of the star and the planet in the binary system, as well as the orbital inclination. The limb-darkening coefficients of the stellar disk were obtained in 10 filters in the wavelength interval 5500-10500 AA. The uncertainties of the fitted parameters were estimated using the differential-correction and confidence-area methods. The wavelength dependence of the limb-darkening coefficients is compared to the corresponding theoretical function for a model thin stellar atmosphere. We confirm the wavelength dependence of the exoplanet's radius found by Pont et al. The exoplanet radius increases with decreasing wavelength, which seems to argue for the presence of an atmosphere around the planet.
Abubekerov M. K.
Cherepashchuk Anatol M.
Gostev Yu. N.
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