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WASP-20b and WASP-28b : a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars
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Anderson, D. R., Collier Cameron, A., Hellier, C., Lendl, M., Lister, T. A., Maxted, P. F. L., Queloz, D., Smalley, B., Smith, A. M. S., Triaud, A. H. M. J., Brown, D. J. A., Gillon, M., Neveu-VanMalle, M., Pepe, F., Pollacco, Don, Ségransan, D., Udry, S., West, Richard G. and Wheatley, Peter J. (2015) WASP-20b and WASP-28b : a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars. Astronomy & Astrophysics, Volume 575 . Article number A61. doi:10.1051/0004-6361/201423591
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Official URL: http://dx.doi.org/10.1051/0004-6361/201423591
Abstract
We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31 MJup; 1.46 RJup) in a 4.9-day, near-aligned (λ = 12.7 ± 4.2°) orbit around CD-24 102 (V = 10.7; F9). Due to the low density of the planet and the apparent brightness of the host star, WASP-20 is a good target for atmospheric characterisation via transmission spectroscopy. WASP-28b is an inflated, Jupiter-mass planet (0.91 MJup; 1.21 RJup) in a 3.4-day, near-aligned (λ = 8 ± 18°) orbit around a V = 12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars (7+ 2-1 Gyr and 6000 ± 100 K for WASP-20; 5+ 3-2 Gyr and 6100 ± 150 K for WASP-28), their orbital alignment is consistent with the hypothesis that close-in giant planets are scattered into eccentric orbits with random alignments, which are then circularised and aligned with their stars’ spins via tidal dissipation.
| Item Type: | Journal Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science > Physics | ||||||||
| Journal or Publication Title: | Astronomy & Astrophysics | ||||||||
| Publisher: | EDP Sciences | ||||||||
| ISSN: | 0004-6361 | ||||||||
| Official Date: | March 2015 | ||||||||
| Dates: |
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| Volume: | Volume 575 | ||||||||
| Article Number: | Article number A61 | ||||||||
| DOI: | 10.1051/0004-6361/201423591 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published |
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