The prograde orbit of exoplanet TrES-2b

Creators: Winn, Joshua N.; Johnson, John Asher; Narita, Norio; Suto, Yasushi; Turner, Edwin L.; Fischer, Debra A.; Butler, R. Paul; Vogt, Steven S.; O'Donovan, Francis T.; Gaudi, B. Scott

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Abstract

We monitored the Doppler shift of the G0 V star TrES-2 throughout a transit of its giant planet. The anomalous Doppler 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.

Additional Information

© 2008 The American Astronomical Society. Received 2008 February 22, accepted for publication 2008 April 10. We thank G. Marcy for advice and encouragement, and D. Charbonneau for helpful conversations. We are grateful for support from the NASA Keck PI Data Analysis Fund (JPL 1326712). J. A. J. is an NSF Astronomy and Astrophysics Postdoctoral Fellow and acknowledges support from NSF grant AST 07-02821. 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 aremost fortunate to have the opportunity to conduct observations from this mountain. Access to the Keck telescopes for this project was through the Telescope System Instrumentation Program, and was supported by AURA through the National Science Foundation under AURA Cooperative Agreement AST 01-32798 as amended.

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