Extrasolar planet HD 189733b whitelight curve

HD 189733b is one of the most extensively studied exoplanets and is a cornerstone for hot Jupiter models. In this paper, we report the dayside emission spectrum of HD 189733b in the wavelength range 1.1-1.7 {mu}m obtained with the Hubble Space Telescope Wide Field Camera 3 (WFC3) in spatial scan mode.

The quality of the data is such that even a straightforward analysis yields a high-precision Poisson noise-limited spectrum: the median 1{sigma} uncertainty is 57 ppm per 0.02 {mu}m bin. We also build a white-light curve correcting for systematic effects and derive an absolute eclipse depth of 96+/-39 ppm. The resulting spectrum shows marginal evidence for water vapor absorption, but can also be well explained by a blackbody spectrum.