Reference : Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and ...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Spin-orbit measurements and refined parameters for the exoplanet systems WASP-22 and WASP-26
Anderson, D. R. [> > > >]
Collier Cameron, A. [> > > >]
Gillon, Michaël mailto [> > > >]
Hellier, C. [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image]
Jehin, Emmanuel [> > > >]
Lendl, M. [> > > >]
Queloz, D. [> > > >]
Smalley, B. [> > > >]
Triaud, A H M J [> > > >]
Vanhuysse, M. [ > > ]
Astronomy and Astrophysics
EDP Sciences
Yes (verified by ORBi)
Les Ulis
[en] Astrophysics - Earth and Planetary Astrophysics
[en] We report on spectroscopic and photometric observations through transits of the exoplanets WASP-22b and WASP-26b, intended to determine the systems' spin-orbit angles. We combine these data with existing data to refine the system parameters. We measure a sky-projected spin-orbit angle of 22 ± 16° for WASP-22b, showing the planet's orbit to be prograde and, perhaps, slightly misaligned. We do not detect the Rossiter-McLaughlin effect of WASP-26b due to its low amplitude and observation noise. We place 3-σ upper limits on orbital eccentricity of 0.063 for WASP-22b and 0.050 for WASP-26b. After refining the drift in the systemic velocity of WASP-22 found by Maxted et al. (2010, AJ, 140, 2007), we find the third body in the system to have a minimum-mass of 5.3 ± 0.3 MJup (a3 / 5 AU)2, where a3 is the orbital distance of the third body.
Submitted to A&A: 8 pages, 4 figures, 3 tables

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