Anderson, DR, Cameron, AC, Hellier, C ORCID: https://orcid.org/0000-0002-3439-1439, Lendl, M, Lister, TA, Maxted, PFL ORCID: https://orcid.org/0000-0003-3794-1317, Queloz, D, Smalley, B ORCID: https://orcid.org/0000-0002-3456-087X, Smith, AMS, Triaud, AHMJ, Brown, DJA, Gillon, M, Neveu-VanMalle, M, Pepe, F, Pollacco, D, Segransan, D, Udry, S, West, RG and Wheatley, PJ (2015) WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars. Astronomy & Astrophysics, 575.

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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: Article
Additional Information: ©ESO
Uncontrolled Keywords: planetary systems, stars, WASP-20b, WASP-28b
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 04 Jun 2015 10:59
Last Modified: 07 May 2019 11:42
URI: http://eprints.keele.ac.uk/id/eprint/566

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