Wasp-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit

@article{Anderson2009Wasp17bAU,
  title={Wasp-17b: An Ultra-Low Density Planet in a Probable Retrograde Orbit},
  author={D. R. Anderson and Coel Hellier and Micha{\"e}l Gillon and Amaury H. M. J. Triaud and Barry Smalley and Leslie Hebb and Andrew Collier Cameron and P. F. L. Maxted and Didier Queloz and Richard G. West and Samuel J. Bentley and B. Enoch and Keith Horne and Tim Lister and Michel Mayor and N. R. Parley and Francesco A. Pepe and Don Pollacco and Damien S'egransan and St{\'e}phane Udry and D. Mark Wilson},
  journal={The Astrophysical Journal},
  year={2009},
  volume={709},
  pages={159-167}
}
We report the discovery of the transiting giant planet WASP-17b, the least-dense planet currently known. It is 1.6 Saturn masses, but 1.5-2 Jupiter radii, giving a density of 6%-14% that of Jupiter. WASP-17b is in a 3.7 day orbit around a sub-solar metallicity, V = 11.6, F6 star. Preliminary detection of the Rossiter-McLaughlin effect suggests that WASP-17b is in a retrograde orbit (λ –150°), indicative of a violent history involving planet-planet or star-planet scattering. WASP-17b's bloated… 

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