Detection of planetary transits across a sun-like star

被引:1173
作者
Charbonneau, D
Brown, TM
Latham, DW
Mayor, M
机构
[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
[2] Natl Ctr Atmospher Res, High Altitude Observ, Boulder, CO 80307 USA
[3] Observ Geneva, CH-1290 Sauverny, Switzerland
基金
美国国家航空航天局; 美国国家科学基金会;
关键词
binaries : eclipsing; planetary systems; stars : individual (HD 209458); techniques : photometric; techniques : radial velocities;
D O I
10.1086/312457
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report high-precision, high-cadence photometric measurements of the star HD 209458, which is known from radial velocity measurements to have a planetary-mass companion in a close orbit. We detect two separate transit events at times that are consistent with the radial velocity measurements. In both cases, the detailed shape of the transit curve due to both the limb darkening of the star and the finite size of the planet is clearly evident. Assuming stellar parameters of 1.1 R. and 1.1 M., we find that the data are best interpreted as a gas giant with a radius of 1.27 +/- 0.02 R-Jup in an orbit with an inclination of 87 degrees 1 +/- 0 degrees 2. We present values for the planetary surface gravity, escape velocity, and average density and discuss the numerous observations that are warranted now that a planet is known to transit the disk of its parent star.
引用
收藏
页码:L45 / L48
页数:4
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