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

Joshua N. Winn | Zendy; John Asher Johnson | Zendy; Geoffrey W. Marcy | Zendy; R. Paul Butler | Zendy; Steven S. Vogt | Zendy; Gregory W. Henry | Zendy; Anna Roussanova | Zendy; Matthew J. Holman | Zendy; Keigo Enya | Zendy; Norio Narita | Zendy; Yasushi Suto | Zendy; Edwin L. Turner | Zendy

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

Author(s) -

Joshua N. Winn,

John Asher Johnson,

Geoffrey W. Marcy,

R. Paul Butler,

Steven S. Vogt,

Gregory W. Henry,

Anna Roussanova,

Matthew J. Holman,

Keigo Enya,

Norio Narita,

Yasushi Suto,

Edwin L. Turner

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/510528

Subject(s) - hot jupiter , exoplanet , eclipse , physics , orbit (dynamics) , transit (satellite) , sky , tidal locking , astronomy , astrophysics , spin (aerodynamics) , planet , public transport , political science , law , engineering , thermodynamics , aerospace engineering

We present spectroscopy of a transit of the exoplanet HD 189733b. By modelingthe Rossiter-McLaughlin effect (the anomalous Doppler shift due to the partialeclipse of the rotating stellar surface), we find the angle between the skyprojections of the stellar spin axis and orbit normal to be lambda = -1.4 +/-1.1 deg. This is the third case of a ``hot Jupiter'' for which lambda has beenmeasured. In all three cases lambda is small, ruling out random orientationswith 99.96% confidence, and suggesting that the inward migration of hotJupiters generally preserves spin-orbit alignment.Comment: ApJ Letters, in pres

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