Reference : WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around s...
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Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars
Anderson, D. R. mailto [> >]
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 mailto [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. [> >]
[en] Astrophysics - Earth and Planetary Astrophysics
[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.
Submitted to A&A. 9 pages, 6 figures, 6 tables. Fixed some typos

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