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From dense hot Jupiter to low-density Neptune : the discovery of WASP-127b, WASP-136b, and WASP-138b
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(2017) From dense hot Jupiter to low-density Neptune : the discovery of WASP-127b, WASP-136b, and WASP-138b. Astronomy & Astrophysics, 599 . A3. doi:10.1051/0004-6361/201629403
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Official URL: http://dx.doi.org/10.1051/0004-6361/201629403
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.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||
| Divisions: | Faculty of Science > Physics | ||||||||
| Library of Congress Subject Headings (LCSH): | Extrasolar planets , Planetary systems, Stars | ||||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
| Publisher: | EDP Sciences | ||||||||
| ISSN: | 0004-6361 | ||||||||
| Official Date: | March 2017 | ||||||||
| Dates: |
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| Volume: | 599 | ||||||||
| Article Number: | A3 | ||||||||
| DOI: | 10.1051/0004-6361/201629403 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Restricted or Subscription Access | ||||||||
| Funder: | University of Warwick, Queen's University of Belfast, University of St. Andrews, University of Keele, University of Leicester, Open University, Royal Greenwich Observatory. Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands), Science and Technology Facilities Council (Great Britain) (STFC), Fonds national de la recherche scientifique (Belgium) (FNRS), Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung [Swiss National Science Foundation] (SNSF), Seventh Framework Programme (European Commission) (FP7), UK Space Agency (UKSA), Fundação para a Ciência e a Tecnologia (FCT) | ||||||||
| Grant number: | FRFC 2.5.594.09.F (FNRS), RG226604 OPTICON, 313014 ETAEARTH (FP7), FCT Contract No. IF/01312/2014 and the grant reference PTDC/FIS-AST/1526/2014 (FCT) |
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