Journal Article

Measurement of the Rossiter–McLaughlin Effect in the Transiting Exoplanetary System TrES-1

Norio Narita, Keigo Enya, Bun’ei Sato, Yasuhiro Ohta, Joshua N. Winn, Yasushi Suto, Atsushi Taruya, Edwin L. Turner, Wako Aoki, Motohide Tamura, Toru Yamada and Yuzuru Yoshii

in Publications of the Astronomical Society of Japan

Published on behalf of Astronomical Society of Japan

Volume 59, issue 4, pages 763-770
Published in print August 2007 | ISSN: 0004-6264
Published online August 2007 | e-ISSN: 2053-051X | DOI: https://dx.doi.org/10.1093/pasj/59.4.763
Measurement of the Rossiter–McLaughlin Effect in the Transiting Exoplanetary System TrES-1

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We report a measurement of the Rossiter–McLaughlin effect in the transiting extrasolar planetary system TrES-1, via simultaneous spectroscopic and photometric observations with the Subaru and MAGNUM telescopes. By modeling the radial velocity anomaly that was observed during a transit, we determine the sky-projected angle between the stellar spin axis and the planetary orbital axis to be [math]. This is the third case for which [math] has been measured in a transiting exoplanetary system, and the first demonstration that such measurements are possible for relatively faint host stars ([math] 12, as compared to [math] 8 for the other systems). We also derive a time of mid-transit, constraints on the eccentricity of the TrES-1b orbit ([math] 0.048[math]0.025), and upper limits on the mass of the Trojan companions ([math] 14 [math]) at the 3[math] level.

Keywords: stars: planetary systems: individual (TrES-1); stars: rotation; techniques: photometric; techniques: radial velocities; techniques: spectroscopic

Journal Article.  5439 words.  Illustrated.

Subjects: Astronomical Instrumentation, Methods, and Techniques ; Stars

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