The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733
Astrophysics
2008-11-26 v3
Abstract
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).
Cite
@article{arxiv.astro-ph/0612224,
title = {The Transit Light Curve Project. V. System Parameters and Stellar Rotation Period of HD 189733},
author = {Joshua N. Winn and Matthew J. Holman and Gregory W. Henry and Anna Roussanova and Keigo Enya and Yuzuru Yoshii and Avi Shporer and Tsevi Mazeh and John A. Johnson and Norio Narita and Yasushi Suto},
journal= {arXiv preprint arXiv:astro-ph/0612224},
year = {2008}
}
Comments
Accepted for publication in AJ [21 pages]; minor changes