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

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arxiv 1811.05292 v2 pith:DRIH7YC7 submitted 2018-11-13 astro-ph.EP

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

Coel Hellier , D.R. Anderson , A.H.M.J. Triaud , F. Bouchy , A. Burdanov , A. Collier Cameron , L. Delrez , D. Ehrenreich
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M. Gillon E. Jehin M. Lendl E. Linder L.D. Nielsen P.F.L. Maxted F. Pepe D. Pollacco D. Queloz D. Segransan B. Smalley J. J. Spake L. Y. Temple S. Udry R.G. West A. Wyttenbach
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keywords wasp-166bbloatedrotationstarstellarsuper-neptuneactivityaligned
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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 lambda = 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''.

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