Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b*

John Asher Johnson; Joshua N. Winn; Norio Narita; Keigo Enya; Peter K. G. Williams; Geoffrey W. Marcy; Bun’ei Sato; Yasuhiro Ohta; Atsushi Taruya; Yasushi Suto; Edwin L. Turner; Gaspar Bakos; R. Paul Butler; Steven S. Vogt; Wako Aoki; Motohide Tamura; Toru Yamada; Yuzuru Yoshii; Marton Hidas

doi:10.1086/591078

Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b^*

John Asher Johnson^1,2, Joshua N. Winn³, Norio Narita⁴, Keigo Enya⁵, Peter K. G. Williams¹, Geoffrey W. Marcy¹, Bun'ei Sato⁶, Yasuhiro Ohta⁷, Atsushi Taruya⁷, Yasushi Suto⁷, Edwin L. Turner⁸, Gaspar Bakos⁹, R. Paul Butler¹⁰, Steven S. Vogt¹¹, Wako Aoki⁴, Motohide Tamura⁴, Toru Yamada¹², Yuzuru Yoshii¹³, and Marton Hidas¹⁴

© 2008. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal, Volume 686, Number 1 Citation John Asher Johnson et al 2008 ApJ 686 649 DOI 10.1086/591078

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¹ Department of Astronomy, University of California, Mail Code 3411, Berkeley, CA 94720

² Current address: Institute for Astronomy, University of Hawaii, Honolulu, HI 96822; NSF Postdoctoral Fellow

³ Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139

⁴ National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

⁵ Department of Infrared Astrophysics, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan

⁶ Global Edge Institute, Tokyo Institute of Technology, 2-12-1 Okayama, Meguro, Tokyo 152-8550, Japan

⁷ Department of Physics, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

⁸ Princeton University Observatory, Peyton Hall, Princeton, NJ 08544

⁹ Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; NSF Postdoctoral Fellow

¹⁰ Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015-1305

¹¹ UCO/Lick Observatory, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064

¹² Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan

¹³ Institute of Astronomy, School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan

¹⁴ Las Cumbres Observatory, 6740 Cortona Drive, Suite 102, Santa Barbara, CA 93117

Dates

Received 2008 April 28
Accepted 2008 June 9

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Abstract

We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, λ = 3.7°± 2.1°. The small value of λ for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial velocity measurements with those obtained previously.

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Footnotes

*
Based on observations obtained at the 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; the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan; and the Lick Observatory, which is operated by the University of California.

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