First exoplanet seen spinning

@article{Cowen2014FirstES,
  title={First exoplanet seen spinning},
  author={Ron Cowen},
  journal={Nature},
  year={2014}
}
  • R. Cowen
  • Published 30 April 2014
  • Physics, Geology
  • Nature
A gas giant orbiting a relatively nearby star rotates every eight hours, its spectrum reveals. 

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TLDR
The combined line profile exhibits a rotational broadening of about 25 kilometres per second, meaning that β Pictoris b spins significantly faster than any planet in the Solar System, in line with the extrapolation of the known trend in spin velocity with planet mass.
The fast spin-rotation of a young extrasolar planet
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