Abstract
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 deg). 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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Hellier, C., Anderson, D. R., Triaud, A. H. M. J., Bouchy, F., Burdanov, A., Cameron, A. C., … Wyttenbach, A. (2019). WASP-166b: A bloated super-Neptune transiting a V = 9 star. Monthly Notices of the Royal Astronomical Society, 488(3), 3067–3075. https://doi.org/10.1093/mnras/stz1903
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