Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b*

Joshua N. Winn; John Asher Johnson; Kathryn M. G. Peek; Geoffrey W. Marcy; Gaspar Á. Bakos; Keigo Enya; Norio Narita; Yasushi Suto; Edwin L. Turner; Steven S. Vogt

doi:10.1086/521362

Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b^*

Joshua N. Winn¹, John Asher Johnson², Kathryn M. G. Peek², Geoffrey W. Marcy², Gaspar Á. Bakos^3,4, Keigo Enya⁵, Norio Narita⁶, Yasushi Suto⁶, Edwin L. Turner⁷, and Steven S. Vogt⁸

Published 2007 August 6 • © 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 665, Number 2 Citation Joshua N. Winn et al 2007 ApJ 665 L167 DOI 10.1086/521362

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Author affiliations

¹ Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139

² Department of Astronomy, University of California, Berkeley, CA 94720

³ Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138

⁴ Hubble Fellow

⁵ Department of Infrared Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 229-8510, Japan

⁶ Department of Physics, The University of Tokyo, Tokyo 113-0033, Japan

⁷ Princeton University Observatory, Princeton, NJ 08544

⁸ UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz, CA 95064

Dates

Received 2007 June 11
Accepted 2007 July 5
Published 2007 August 6

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Abstract

The short-period exoplanet HD 147506b (also known as HAT-P-2b) has an eccentric orbit, raising the possibility that it migrated through planet-planet scattering or Kozai oscillations accompanied by tidal dissipation. Either of these scenarios could have significantly tilted the orbit relative to the host star's equatorial plane. Here we present spectroscopy of a transit of HD 147506b and assess the spin-orbit alignment via the Rossiter-McLaughlin effect. We find the angle between the sky projections of the stellar spin axis and orbital axis to be aligned within 14°. Thus, we find no corroborating evidence for scattering or Kozai migration, although these scenarios cannot be ruled out with the present data.

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Footnotes

*
Data presented herein were obtained at the W. M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration, and was made possible by the generous financial support of the W. M. Keck Foundation.

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Spin-Orbit Alignment for the Eccentric Exoplanet HD 147506b*