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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

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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:
DateEvent
March 2015Published
5 December 2014Accepted
6 February 2014Submitted
Volume: Volume 575
Article Number: Article number A61
DOI: 10.1051/0004-6361/201423591
Status: Peer Reviewed
Publication Status: Published

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