WASP-54b, WASP-56b and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP ⋆

  title={WASP-54b, WASP-56b and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP ⋆},
  author={Francesca Faedi and Don Pollacco and S. C. C. Barros and D. J. A. Brown and Andrew Collier Cameron and Amanda P. Doyle and Rachel M. Enoch and Micha{\"e}l Gillon and Yilen G'omez Maqueo Chew and Guillaume H{\'e}brard and Monika Lendl and Christine Liebig and Barry Smalley and A. H. M. J. Triaud and Richard G. West and Peter J. Wheatley and Khalid A. Alsubai and D. R. Anderson and David J Armstrong and Joao Bento and J. Bochiński and François Bouchy and R. Busuttil and Luca Fossati and Aur{\'e}lie Fumel and Carole A. Haswell and Coel Hellier and Stefan Holmes and Emmanuel Jehin and Ulrich C. Kolb and J. McCormac and Grant R. M. Miller and Claire Moutou and Andrew J. Norton and N. R. Parley and Didier Queloz and Alexandre Santerne and Ian Skillen and A M S Smith and St{\'e}phane Udry and Christopher A. Watson},
  journal={Astronomy and Astrophysics},
We present three newly discovered sub-Jupiter mass planets from the SuperWASP survey: WASP-54b is a heavily bloated planet of mass 0.636(-0.024)(+0.025) M-J and radius 1.653(-0.083)(+0.090) R-J. It orbits a F9 star, evolving off the main sequence, every 3.69 days. Our MCMC fit of the system yields a slightly eccentric orbit (e = 0.067(-0.025)(+ 0.033)) for WASP-54b. We investigated further the veracity of our detection of the eccentric orbit for WASP-54b, and we find that it could be real… 
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