Measurement of the Rossiter-Laughlin Effect in the Transiting Exoplanetary System TrES-1
Abstract
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.
- Publication:
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Publications of the Astronomical Society of Japan
- Pub Date:
- August 2007
- DOI:
- 10.1093/pasj/59.4.763
- arXiv:
- arXiv:astro-ph/0702707
- Bibcode:
- 2007PASJ...59..763N
- Keywords:
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- Astrophysics
- E-Print:
- 8 pages, 5 figures, 2 tables. Published in PASJ. Corrected typos