WASP-166b: a bloated super-Neptune transiting a V = 9 star

Coel Hellier, A. H. M. J. Triaud, F. Bouchy, A. Burdanov, A. Collier Cameron, L. Delrez, D. Ehrenreich, M. Gillon, E. Jehin, M. Lendl, E. Linder, L. D. Nielsen, P. F. L. Maxted, F. Pepe, D. Pollacco, D. Queloz, D. Ségransan, B. Smalley, J. J. Spake, L. Y. TempleS. Udry, R. G. West, A. Wyttenbach

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We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 MJup (1.9 MNep) and a bloated radius of 0.63 RJup. It transits a V = 9.36, F9V star in a 5.44-d orbit that is aligned with the stellar rotation axis (sky-projected obliquity angle λ = 3 ± 5 degrees). Variations in the radial-velocity measurements are likely the result of magnetic activity over a 12-d stellar rotation period. WASP-166b appears to be a rare object within the “Neptune desert”.
Original languageEnglish
Pages (from-to)3067-3075
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date10 Jul 2019
Publication statusPublished - Sept 2019


  • Planetary systems
  • Stars: individual (WASP-166)


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