Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Physical Sciences and Mathematics
The Rotation Period Of The Planet-Hosting Star Hd 189733, Gregory W. Henry, Joshua N. Winn
The Rotation Period Of The Planet-Hosting Star Hd 189733, Gregory W. Henry, Joshua N. Winn
Information Systems and Engineering Management Research Publications
We present synoptic optical photometry of HD 189733, the chromospherically active parent star of one of the most intensively studied exoplanets. We have significantly extended the timespan of our previously reported observations and refined the estimate of the stellar rotation period by more than an order of magnitude: P = 11.953 ± 0.009 days. We derive a lower limit on the inclination of the stellar rotation axis of 54° (with 95% confidence), corroborating earlier evidence that the stellar spin axis and planetary orbital axis are well aligned.
The Transit Light Curve Project. V. System Parameters And Stellar Rotation Period Of Hd 189733, Joshua N. Winn, Matthew J. Holman, Gregory W. Henry, Anna Roussanova, Keigo Enya, Yuzuru Yoshii, Avi Shporer, Tsevi Mazeh, John Asher Johnson, Norio Narita
The Transit Light Curve Project. V. System Parameters And Stellar Rotation Period Of Hd 189733, Joshua N. Winn, Matthew J. Holman, Gregory W. Henry, Anna Roussanova, Keigo Enya, Yuzuru Yoshii, Avi Shporer, Tsevi Mazeh, John Asher Johnson, Norio Narita
Information Systems and Engineering Management Research Publications
We present photometry of HD 189733 during eight transits of its close-in giant planet, and out-of-transit photometry spanning 2 yr. Using the transit photometry, we determine the stellar and planetary radii and the photometric ephemeris. Outside of transits, there are quasi-periodic 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).