Parameters and predictions for the long-period transiting planet HD 17156b

被引:22
作者
Irwin, Jonathan [1 ]
Charbonneau, David [1 ]
Nutzman, Philip [1 ]
Welsh, William F. [2 ]
Rajan, Abhijith [2 ]
Hidas, Marton [3 ]
Brown, Timothy M. [3 ]
Lister, Timothy A. [3 ]
Davies, Donald
Laughlin, Gregory [4 ]
Langton, Jonathan [4 ]
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA
[3] Las Cumbres Observ, Santa Barbara, CA 93117 USA
[4] Univ Calif Santa Cruz, UCO, Lick Observ, Santa Cruz, CA 95064 USA
基金
美国国家科学基金会;
关键词
planetary systems; stars : individual (HD 17156); techniques : photometric;
D O I
10.1086/588461
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report high-cadence time series photometry of the recently discovered transiting exoplanet system HD 17156, spanning the time of transit on UT 2007 October 1, from three separate observatories. We present a joint analysis of our photometry, previously published radial velocity measurements, and times of transit center for three additional events. Adopting the spectroscopically determined values and uncertainties for the stellar mass and radius, we estimate a planet radius of R-p 1.01 +/- 0.09 R-Jup and an inclination of i = 86.5(-0.7)(+1.1) deg. We find a time of transit center of T-c 2,454, 374.8338 +/- 0.0020 HJD and an orbital period of P = 21.21691 +/- 0.00071 days and note that the four transits reported to date show no sign of timing variations that would indicate the presence of a third body in the system. Our results do not preclude the existence of a secondary eclipse, but imply that there is only a 9.2% chance for this to be present and an even lower probability (6.9%) that the secondary eclipse would be a nongrazing event. Due to its eccentric orbit and long period, HD 17156b is a fascinating object for the study of the dynamics of exoplanet atmospheres. To aid such future studies, we present theoretical light curves for the variable infrared emission from the visible hemisphere of the planet throughout its orbit.
引用
收藏
页码:636 / 643
页数:8
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