Keele Research Repository
Explore the Repository
Anderson, DR, Cameron, AC, Hellier, C, Lendl, M, Lister, TA, Maxted, PFL, Queloz, D, Smalley, B, 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. ISSN 0004-6361
D Anderson - WASP-20b and WASP-28b - a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars.pdf - Accepted Version
Available under License Creative Commons Attribution.
Download (681kB) | Preview
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: | https://eprints.keele.ac.uk/id/eprint/566 |