TY - JOUR
T1 - WASP-94 A and B planets
T2 - hot-Jupiter cousins in a twin-star system
AU - Neveu-VanMalle, M.
AU - Queloz, Didier
AU - Anderson, D.~R.
AU - Charbonnel, C.
AU - Collier Cameron, A.
AU - Delrez, L.
AU - Gillon, M.
AU - Hellier, C.
AU - Jehin, E.
AU - Lendl, M.
AU - Maxted, P.F.L.
AU - Pepe, F.
AU - Pollacco, D.
AU - Ségransan, D.
AU - Smalley, B.
AU - Smith, A.M.S.
AU - Southworth, J.
AU - Triaud, A.H.M.J.
AU - Udry, S.
AU - West, R.G.
PY - 2014/12
Y1 - 2014/12
N2 - We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 MJup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.
AB - We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJup, and an orbital period of 3.95 days. The Rossiter-McLaughlin effect is clearly detected, and the measured projected spin-orbit angle indicates that the planet occupies a retrograde orbit. WASP-94B (2MASS 20550915–3408078) is an F9 stellar companion at an angular separation of 15′′ (projected separation 2700 au), hosting a gas giant with a minimum mass of 0.618 ± 0.028 MJup with a period of 2.008 days, detected by Doppler measurements. The orbital planes of the two planets are inclined relative to each other, indicating that at least one of them is inclined relative to the plane of the stellar binary. These hot Jupiters in a binary system bring new insights into the formation of close-in giant planets and the role of stellar multiplicity.
KW - planetary systems
KW - stars: individual: WASP-94
KW - techniques: photometric
KW - techniques: radial velocities
KW - techniques: spectroscopic
KW - binaries: visual
U2 - 10.1051/0004-6361/201424744
DO - 10.1051/0004-6361/201424744
M3 - Article
SN - 0004-6361
VL - 572
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A49
ER -