Projects per year
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.
Original language | English |
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Article number | A3 |
Number of pages | 10 |
Journal | Astronomy & Astrophysics |
Volume | 599 |
Early online date | 20 Feb 2017 |
DOIs | |
Publication status | Published - 1 Mar 2017 |
Keywords
- Planetary systems
- Stars: individual: WASP-127
- Stars: individual: WASP-136
- Stars: individual: WASP-138
- Techniques: photometric
- Techniques: radial velocities
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- 4 Finished
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Astronomy at St Andrews 2015-2018: Astronomy at St Andrews 2015-2018
Jardine, M. M. (PI), Cameron, A. C. (CoI), Cyganowski, C. J. (CoI), Horne, K. D. (CoI) & Wood, K. (CoI)
Science & Technology Facilities Council
1/04/15 → 31/03/18
Project: Standard
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PATT linked Travel and Subsistence: St Andrrews Astronomy PATT linked Travel and subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/10 → 30/09/13
Project: Standard
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PATT Linked Travel ST/G001006/1: Patt Linked Travel & Subsistence
Cameron, A. C. (PI), Driver, S. P. (CoI), Greaves, J. S. (CoI) & Horne, K. D. (CoI)
Science & Technology Facilities Council
1/10/08 → 30/09/10
Project: Standard