Detection of an Extrasolar Planet Atmosphere

@article{Charbonneau2001DetectionOA,
  title={Detection of an Extrasolar Planet Atmosphere},
  author={David Charbonneau and Timothy M. Brown and Robert W. Noyes and Ronald L. Gilliland},
  journal={The Astrophysical Journal},
  year={2001},
  volume={568},
  pages={377 - 384}
}
We report high-precision spectrophotometric observations of four planetary transits of HD 209458, in the region of the sodium resonance doublet at 589.3 nm. We find that the photometric dimming during transit in a bandpass centered on the sodium feature is deeper by (2.32 ± 0.57) × 10-4 relative to simultaneous observations of the transit in adjacent bands. We interpret this additional dimming as absorption from sodium in the planetary atmosphere, as recently predicted from several theoretical… 

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