The Prograde Orbit of Exoplanet TrES‐2b
The Astrophysical Journal2008Vol. 682(2), pp. 1283–1288
Citations Over TimeTop 10% of 2008 papers
Joshua N. Winn, John Asher Johnson, Norio Narita, Yasushi Suto, Edwin L. Turner, Debra A. Fischer, R. Paul Butler, Steven S. Vogt, Francis T. O’Donovan, B. Scott Gaudi
Abstract
We monitored the Doppler shift of the G0 V star TrES-2 throughout a transit of its giant planet. The anomalous \nDoppler shift due to stellar rotation (the Rossiter-McLaughlin effect) is discernible in the data, with a signal-to-noise ratio of 2.9, even though the star is a slow rotator. By modeling this effect we find that the planet’s trajectory across the face of the star is tilted by -9° ± 12° relative to the projected stellar equator. With 98% confidence, the orbit is prograde.
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