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WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars
Anderson, D. R.; Collier Cameron, A.; Hellier, C. et al.
2014
 

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Keywords :
Astrophysics - Earth and Planetary Astrophysics
Abstract :
[en] 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 $M_{\rm Jup}$; 1.46 $R_{\rm Jup}$) in a 4.9-day, near-aligned ($\lambda = 8.1 \pm 3.6^\circ$) orbit around CD-24 102 ($V$=10.7; F9). WASP-28b is an inflated, Jupiter-mass planet (0.91 $M_{\rm Jup}$; 1.21 $R_{\rm Jup}$) in a 3.4-day, near-aligned ($\lambda = 8 \pm 18^\circ$) orbit around a $V$=12, F8 star. As intermediate-mass planets in short orbits around aged, cool stars ($7^{+2}_{-1}$ Gyr for WASP-20 and $5^{+3}_{-2}$ Gyr for WASP-28; both with $T_{\rm eff}$ < 6250 K), 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Anderson, D. R.
Collier Cameron, A.
Hellier, C.
Lendl, M.
Lister, T. A.
Maxted, P. F. L.
Queloz, D.
Smalley, B.
Smith, A. M.
Triaud, A. H. M. J.
Brown, D. J. A.
Gillon, Michaël  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Neveu-VanMalle, M.
Pepe, F.
Pollacco, D.
Segransan, D.
Udry, S.
West, R. G.
Wheatley, P. J.
More authors (9 more) Less
Language :
English
Title :
WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars
Publication date :
01 February 2014
Commentary :
Submitted to A&A. 9 pages, 6 figures, 6 tables. Fixed some typos
Available on ORBi :
since 29 March 2014

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