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Title:
Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733
Authors:
Winn, Joshua N.; Johnson, John Asher; Marcy, Geoffrey W.; Butler, R. Paul; Vogt, Steven S.; Henry, Gregory W.; Roussanova, Anna; Holman, Matthew J.; Enya, Keigo; Narita, Norio; Suto, Yasushi; Turner, Edwin L.
Affiliation:
AA(Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139.), AB(Department of Astronomy, University of California, MC 3411, Berkeley, CA 94720.), AC(Department of Astronomy, University of California, MC 3411, Berkeley, CA 94720.), AD(Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road, NW, Washington, DC 20015-1305.), AE(UCO/Lick Observatory, University of California at Santa Cruz, Santa Cruz, CA 95064.), AF(Center of Excellence in Information Systems, Tennessee State University, 3500 John A. Merritt Boulevard, Box 9501, Nashville, TN 37209.), AG(Department of Physics, and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139.), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AI(Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan.), AJ(Department of Physics, University of Tokyo, Tokyo 113-0033, Japan.), AK(Department of Physics, University of Tokyo, Tokyo 113-0033, Japan.), AL(Princeton University Observatory, Peyton Hall, Princeton, NJ 08544.)
Publication:
The Astrophysical Journal, Volume 653, Issue 1, pp. L69-L72. (ApJL Homepage)
Publication Date:
12/2006
Origin:
UCP
ApJ Keywords:
Stars: Planetary Systems, Stars: Planetary Systems: Formation, stars: individual (HD 189733), Stars: Rotation
DOI:
10.1086/510528
Bibliographic Code:
2006ApJ...653L..69W

Abstract

We present spectroscopy of a transit of the exoplanet HD 189733b. By modeling the Rossiter-McLaughlin effect (the anomalous Doppler shift due to the partial eclipse of the rotating stellar surface), we find the angle between the sky projections of the stellar spin axis and orbit normal to be λ=-1.4d+/-1.1d. This is the third case of a ``hot Jupiter'' for which λ has been measured. In all three cases λ is small, ruling out random orientations with 99.96% confidence, and suggesting that the inward migration of hot Jupiters generally preserves spin-orbit alignment.

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 NASA, and was made possible by the generous financial support of the W. M. Keck Foundation.


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