Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b

Details Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b Measurement of the Spin-Orbit Angle of Exoplanet HAT-P-1b

2008-06-10

arxiv.org/abs/0806.1734v1

Astronomy and Astrophysics

Astrophysics

28 total pages, 4 figures, 4 tables, ApJ Accepted

Scientific paper

10.1086/591078

We present new spectroscopic and photometric observations of the HAT-P-1 planetary system. Spectra obtained during three transits exhibit the Rossiter-McLaughlin effect, allowing us to measure the angle between the sky projections of the stellar spin axis and orbit normal, \lambda = 3.7 +/- 2.1 degrees. The small value of \lambda for this and other systems suggests that the dominant planet migration mechanism preserves spin-orbit alignment. Using two new transit light curves, we refine the transit ephemeris and reduce the uncertainty in the orbital period by an order of magnitude. We find a upper limit on the orbital eccentricity of 0.067, with 99% confidence, by combining our new radial-velocity measurements with those obtained previously.

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