A nearly polar orbit for the extrasolar hot jupiter WASP-79b

B. C. Addison, C. G. Tinney, D. J. Wright, D. Bayliss, G. Zhou, J. D. Hartman, G. A. Bakos, B. Schmidt

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41 Scopus citations


We report the measurement of a spin-orbit misalignment for WASP-79b, a recently discovered, bloated hot Jupiter from the Wide Angle Search for Planets (WASP) survey. Data were obtained using the CYCLOPS2 optical-fiber bundle and its simultaneous calibration system feeding theUCLES spectrograph on theAnglo-Australian Telescope. We have used the Rossiter McLaughlin effect to determine the sky-projected spin-orbit angle to be λ = -106 +19-13 This result indicates a significant misalignment between the spin axis of the host star and the orbital plane of the planet-the planet being in a nearly polar orbit. WASP-79 is consistent with other stars that have Teff < 6250 Kand host hot Jupiters in spin-orbit misalignment.

Original languageEnglish (US)
Article numberL9
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Sep 1 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planets and satellites: dynamical evolution and stability
  • stars: individual (WASP-79)
  • techniques: radial velocities


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