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

2006/09/30 by Joshua N. Winn, John A. Johnson, John Asher Johnson +10 · 12 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Doppler effect #Eclipse #Exoplanet #History and Developments in Astronomy #Hot Jupiter #Orbit (dynamics) #Planetary system #Sky #Stellar rotation #Stellar, planetary, and galactic studies #Transit (satellite) #astro-ph

paper · pdf · doi:10.1086/510528

published as Astrophys.J.653:L69-L72,2006 · ApJ Letters, in press

arxiv created 2006/11/03 · openalex publication_date 2006/11/30 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

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 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.

Citations

• A Jupiter-mass companion to a solar-type star
• The Rossiter‐McLaughlin Effect and Analytic Radial Velocity Curves for Transiting Extrasolar Planetary Systems
• Observed Properties of Exoplanets: Masses, Orbits, and Metallicities
• Inference from Iterative Simulation Using Multiple Sequences
• Statistical properties of exoplanets

Cited by

• The Transit Light Curve Project. III. Tres Transits of TrES‐1
• Measurement of the Spin‐Orbit Angle of Exoplanet HAT‐P‐1b
• THE ROTATION PERIOD OF THE PLANET-HOSTING STAR HD 189733
• Homogeneous studies of transiting extrasolar planets – I. Light-curve analyses
• Deriving the radial-velocity variations induced by stellar activity from high-precision photometry
• The Rossiter-McLaughlin effect of CoRoT-3b and HD 189733b
• Detection of sodium in the atmosphere of WASP-69b
• MOSTSpace‐based Photometry of the Transiting Exoplanet System HD 189733: Precise Timing Measurements for Transits across an Active Star
• The center-to-limb variation across the Fraunhofer lines of HD 189733
• Improved Parameters for Extrasolar Transiting Planets
• The architecture of the GJ 876 planetary system
• THE CLIMATE OF HD 189733b FROM FOURTEEN TRANSITS AND ECLIPSES MEASURED BYSPITZER