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, Yuzuru Yoshii

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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 λ = 30° ± 21°. This is the third case for which λ has been measured in a transiting exoplanetary system, and the first demonstration that such measurements are possible for relatively faint host stars (V ∼ 12, as compared to V ∼ 8 for the other systems). We also derive a time of mid-transit, constraints on the eccentricity of the TrES-1b orbit (e = 0.048±0.025), and upper limits on the mass of the Trojan companions (≲ 14 M) at the 3σ level.

Original languageEnglish (US)
Pages (from-to)763-770
Number of pages8
JournalPublications of the Astronomical Society of Japan
Issue number4
StatePublished - 2007

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Stars: planetary systems: individual (TrES-1)
  • Stars: rotation
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic


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