Fast spin of the young extrasolar planet β Pictoris b

  title={Fast spin of the young extrasolar planet $\beta$ Pictoris b},
  author={Ignas A. G. Snellen and Bernhard Brandl and Remco J. de Kok and Matteo Brogi and Jayne L. Birkby and Henriette Schwarz},
The spin of a planet arises from the accretion of angular momentum during its formation, but the details of this process are still unclear. In the Solar System, the equatorial rotation velocities and, consequently, spin angular momenta of most of the planets increase with planetary mass; the exceptions to this trend are Mercury and Venus, which, since formation, have significantly spun down because of tidal interactions. Here we report near-infrared spectroscopic observations, at a resolving… 
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