WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system

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Authors

  • M. Neveu-VanMalle
  • Didier Queloz
  • D.~R. Anderson
  • C. Charbonnel
  • A. Collier Cameron
  • L. Delrez
  • M. Gillon
  • C. Hellier
  • E. Jehin
  • M. Lendl
  • P.F.L. Maxted
  • F. Pepe
  • D. Pollacco
  • D. Ségransan
  • B. Smalley
  • A.M.S. Smith
  • J. Southworth
  • S. Udry
  • R.G. West

Colleges, School and Institutes

Abstract

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.

Details

Original languageEnglish
Article numberA49
Number of pages5
JournalAstronomy and Astrophysics
Volume572
Early online date26 Nov 2014
Publication statusPublished - Dec 2014

Keywords

  • planetary systems, stars: individual: WASP-94, techniques: photometric, techniques: radial velocities, techniques: spectroscopic, binaries: visual