期刊
ASTROPHYSICAL JOURNAL
卷 682, 期 2, 页码 1283-1288出版社
UNIV CHICAGO PRESS
DOI: 10.1086/589235
关键词
planetary systems; planetary systems : formation; stars : individual (GSC 03549-02811 TrES-2); stars : rotation
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 degrees +/- 12 degrees relative to the projected stellar equator. With 98% confidence, the orbit is prograde.
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