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The center-to-limb variation (CLV) describes the brightness of the stellardisk as a function of the limb angle. Across strong absorption lines, the CLVcan vary quite significantly. We obtained a densely sampled time series ofhigh-resolution transit spectra of the active planet host star HD 189733 withUVES. Using the passing planetary disk of the hot Jupiter HD 189733 b as aprobe, we study the CLV in the wings of the Ca II H and K and Na I D1 and D2Fraunhofer lines, which are not strongly affected by activity-inducedvariability. In agreement with model predictions, our analysis shows that thewings of the studied Fraunhofer lines are limb brightened with respect to the(quasi-)continuum. The strength of the CLV-induced effect can be on the sameorder as signals found for hot Jupiter atmospheres. Therefore, a carefultreatment of the wavelength dependence of the stellar CLV in strong absorptionlines is highly relevant in the interpretation of planetary transitspectroscopy.

The center-to-limb variation across the Fraunhofer lines of HD 189733; Sampling the stellar spectrum using a transiting planet