Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 1 of 1
Full-Text Articles in Physical Sciences and Mathematics
Measurement Of The Spin-Orbit Alignment In The Exoplanetary System Hd 189733, Joshua N. Winn, John Asher Johnson, Geoffrey W. Marcy, R. Paul Butler, Steve Vogt, Gregory W. Henry, Anna Roussanova, Matthew J. Holman, Keigo Enya, Norio Narita, Yasushi Suto, Edwin L. Turner
Measurement Of The Spin-Orbit Alignment In The Exoplanetary System Hd 189733, Joshua N. Winn, John Asher Johnson, Geoffrey W. Marcy, R. Paul Butler, Steve Vogt, Gregory W. Henry, Anna Roussanova, Matthew J. Holman, Keigo Enya, Norio Narita, Yasushi Suto, Edwin L. Turner
Information Systems and Engineering Management Research Publications
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 = -1fdg4 ± 1fdg1. 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.