Spectroscopic observations of a young exoplanet have allowed its spin velocity to be directly measured. Its fast spin is in accord with the extrapolation of the known trend in spin velocity as a function of planet mass. See Letter p.63
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Barman, T. A new spin on exoplanets. Nature 509, 41–42 (2014). https://doi.org/10.1038/509041a
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DOI: https://doi.org/10.1038/509041a
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