Reference : WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/171346
WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit
English
Lendl, Monika [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Triaud, A. H. M. J. [> >]
Anderson, D. R. [> >]
Collier Cameron, A. [> >]
Delrez, Laetitia [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Doyle, A. [> >]
Gillon, Michaël [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Hellier, C. [> >]
Jehin, Emmanuel [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Maxted, P. F. L. [> >]
Neveu-VanMalle, M. [> >]
Pepe, F. [> >]
Pollacco, D. [> >]
Queloz, D. [> >]
Segransan, D. [> >]
Smalley, B. [> >]
Smith, A. M. S. [> >]
Udry, S. [> >]
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
West, R. G. [> >]
Aug-2014
Astronomy and Astrophysics
EDP Sciences
568
81
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics - Earth and Planetary Astrophysics ; Astrophysics - Solar and Stellar Astrophysics
[en] We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of M_p = 0.2755 (+/-0.0090) M_jup, a radius of R_p = 1.021 (-0.065 +0.076) R_jup and is in an eccentric (e = 0.302 +/-0.023), 10.02165 +/- 0.00055 d orbit around a main-sequence F9 star. The host star's brightness (V=10.15 mag) makes WASP-117 a good target for follow-up observations, and with a planetary equilibrium temperature of T_eq = 1024 (-26 +30) K and a low planetary density (rho_p = 0.259 (-0.048 +0.054) rho_jup) it is one of the best targets for transmission spectroscopy among planets with periods around 10 days. From a measurement of the Rossiter-McLaughlin effect, we infer a projected angle between the planetary orbit and stellar spin axes of beta = -44 (+/-11) deg, and we further derive an orbital obliquity of psi = 69.5 (+3.6 -3.1) deg. Owing to the large orbital separation, tidal forces causing orbital circularization and realignment of the planetary orbit with the stellar plane are weak, having had little impact on the planetary orbit over the system lifetime. WASP-117b joins a small sample of transiting giant planets with well characterized orbits at periods above ~8 days.
http://hdl.handle.net/2268/171346
10.1051/0004-6361/201424481

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