The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733

Details The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733 The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733

2006-12-08

arxiv.org/abs/astro-ph/0612224v3

Astron.J.133:1828-1835,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication in AJ [21 pages]; minor changes

Scientific paper

10.1086/512159

We present photometry of HD 189733 during eight transits of its close-in giant planet, and out-of-transit photometry spanning two years. Using the transit photometry, we determine the stellar and planetary radii and the photometric ephemeris. Outside of transits, there are quasiperiodic flux variations with a 13.4 day period that we attribute to stellar rotation. In combination with previous results, we derive upper limits on the orbital eccentricity, and on the true angle between the stellar rotation axis and planetary orbit (as opposed to the angle between the projections of those axes on the sky).

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