The signature of orbital motion from the dayside of the planet τ Boötis b

  title={The signature of orbital motion from the dayside of the planet $\tau$ Bo{\"o}tis b},
  author={Matteo Brogi and Ignas A. G. Snellen and Remco J. de Kok and Simon H. Albrecht and Jayne L. Birkby and Ernst J. W. de Mooij},
The giant planet orbiting τ Boötis (named τ Boötis b) was amongst the first extrasolar planets to be discovered. It is one of the brightest exoplanets and one of the nearest to us, with an orbital period of just a few days. Over the course of more than a decade, measurements of its orbital inclination have been announced and refuted, and have hitherto remained elusive. Here we report the detection of carbon monoxide absorption in the thermal dayside spectrum of τ Boötis b. At a spectral… 

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