From dense hot Jupiter to low-density Neptune : the discovery of WASP-127b, WASP-136b, and WASP-138b
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We report three newly discovered exoplanets from the SuperWASP survey. WASP-127b is a heavily inflated super-Neptune of mass 0.18 ± 0.02 MJ and radius 1.37 ± 0.04 RJ. This is one of the least massive planets discovered by the WASP project. It orbits a bright host star (Vmag = 10.16) of spectral type G5 with a period of 4.17 days. WASP-127b is a low-density planet that has an extended atmosphere with a scale height of 2500 ± 400 km, making it an ideal candidate for transmission spectroscopy. WASP-136b and WASP-138b are both hot Jupiters with mass and radii of 1.51 ± 0.08 MJ and 1.38 ± 0.16 RJ, and 1.22 ± 0.08 MJ and 1.09 ± 0.05 RJ, respectively. WASP-136b is in a 5.22-day orbit around an F9 subgiant star with a mass of 1.41 ± 0.07 M⊙ and a radius of 2.21 ± 0.22 R⊙. The discovery of WASP-136b could help constrain the characteristics of the giant planet population around evolved stars. WASP-138b orbits an F7 star with a period of 3.63 days. Its radius agrees with theoretical values from standard models, suggesting the presence of a heavy element core with a mass of ∼ 10 M⊕. The discovery of these new planets helps in exploring the diverse compositional range of short-period planets, and will aid our understanding of the physical characteristics of both gas giants and low-density planets.
Lam , K W F , Faedi , F , Brown , D J A , Anderson , D R , Delrez , L , Gillon , M , Hébrard , G , Lendl , M , Mancini , L , Southworth , J , Smalley , B , Triaud , A H M , Turner , O D , Hay , K L , Armstrong , D J , Barros , S C C , Bonomo , A S , Bouchy , F , Boumis , P , Collier Cameron , A , Doyle , A P , Hellier , C , Henning , T , Jehin , E , King , G , Kirk , J , Louden , T , Maxted , P F L , McCormac , J J , Osborn , H P , Palle , E , Pepe , F , Pollacco , D , Prieto-Arranz , J , Queloz , D , Rey , J , Ségransan , D , Udry , S , Walker , S , West , R G & Wheatley , P J 2017 , ' From dense hot Jupiter to low-density Neptune : the discovery of WASP-127b, WASP-136b, and WASP-138b ' Astronomy & Astrophysics , vol 599 , A3 . DOI: 10.1051/0004-6361/201629403
Astronomy & Astrophysics
© ESO, 2017. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at: https://doi.org/10.1051/0004-6361/201629403
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