From dense hot Jupiter to low-density Neptune: The discovery of WASP-127b, WASP-136b, and WASP-138b
Journal
Date Issued
2017
Author(s)
Lam, K. W. F.
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Faedi, F.
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Brown, D. J. A.
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Anderson, D. R.
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Delrez, L.
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Gillon, M.
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Hébrard, G.
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Lendl, M.
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Mancini, L.
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Southworth, J.
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Smalley, B.
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Triaud, A. H. M.
•
Turner, O. D.
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Hay, K. L.
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Armstrong, D. J.
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Barros, S. C. C.
•
•
Bouchy, F.
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Boumis, P.
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Collier Cameron, A.
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Doyle, A. P.
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Hellier, C.
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Henning, T.
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Jehin, E.
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King, G.
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Kirk, J.
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Louden, T.
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Maxted, P. F. L.
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McCormac, J. J.
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Osborn, H. P.
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Palle, E.
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Pepe, F.
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Pollacco, D.
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Prieto-Arranz, J.
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Queloz, D.
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Rey, J.
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Ségransan, D.
•
Udry, S.
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Walker, S.
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West, R. G.
•
Wheatley, P. J.
Abstract
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.
Radial velocity and photometry tables are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/599/A3
Volume
599
Start page
A3
Issn Identifier
0004-6361
Ads BibCode
2017A&A...599A...3L
Rights
open.access
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