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Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733

Winn, Joshua N. and Johnson, John Asher and Marcy, Geoffrey W. and Butler, R. Paul and Vogt, Steven S. and Henry, Gregory W. and Roussanova, Anna and Holman, Matthew J. and Enya, Keigo and Narita, Norio and Suto, Yasushi and Turner, Edwin L. (2006) Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733. Astrophysical Journal, 653 (1). L69-L72. ISSN 0004-637X.

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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°.4 ± 1°.1. 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Winn, Joshua N.0000-0002-4265-047X
Johnson, John Asher0000-0001-9808-7172
Marcy, Geoffrey W.0000-0002-2909-0113
Henry, Gregory W.0000-0003-4155-8513
Holman, Matthew J.0000-0002-1139-4880
Additional Information:© 2006 American Astronomical Society. Received 2006 September 15; accepted 2006 November 1; published 2006 November 30. 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. We thank Debra Fischer for running SME on our spectra and Scott Gaudi for very helpful discussions. We recognize and acknowledge the very significant cultural role and reverence that the summit of Mauna Kea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.
Subject Keywords:planetary systems; planetary systems: formation; stars: individual (HD 189733); stars: rotation
Issue or Number:1
Record Number:CaltechAUTHORS:20130122-104241039
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Official Citation:Measurement of the Spin-Orbit Alignment in the Exoplanetary System HD 189733 Joshua N. Winn et al. 2006 ApJ 653 L69
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36506
Deposited By: Jason Perez
Deposited On:23 Jan 2013 19:27
Last Modified:09 Mar 2020 13:18

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