# A Nearly Polar Orbit for the Extrasolar Hot Jupiter WASP-79b

## Author(s): Addison, BC; Tinney, CG; Wright, DJ; Bayliss, D; Zhou, G; et al

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 Abstract: 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 the UCLES spectrograph on the Anglo-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 T eff > 6250 K and host hot Jupiters in spin-orbit misalignment. Publication Date: 1-Sep-2013 Electronic Publication Date: 14-Aug-2013 Citation: Addison, BC, Tinney, CG, Wright, DJ, Bayliss, D, Zhou, G, Hartman, JD, Bakos, GÁ, Schmidt, B. (2013). A Nearly Polar Orbit for the Extrasolar Hot Jupiter WASP-79b. \apj, 774 (L9 - L9. doi:10.1088/2041-8205/774/1/L9 DOI: doi:10.1088/2041-8205/774/1/L9 Type of Material: Journal Article Journal/Proceeding Title: Astrophysical Journal Letters Version: Final published version. This is an open access article.