期刊
ASTROPHYSICAL JOURNAL
卷 658, 期 2, 页码 1322-1327出版社
IOP PUBLISHING LTD
DOI: 10.1086/512008
关键词
planetary systems; stars : individual (WASP-1, WASP-2); techniques : photometric
We present precise z-band photometric time series spanning times of transit of the two exoplanets recently discovered by the SuperWASP collaboration. We find planetary radii of 1.44 +/- 0.08 and 1.04 +/- 0.06 R-J for WASP-1b and WASP-2b, respectively. These error estimates include both random errors in the photometry and also the uncertainty in the stellar masses. Our results are 5 times more precise than the values derived from the discovery data alone. Our measurement of the radius of WASP-2b agrees with previously published models of hot Jupiters that include both a 20 M-circle plus core of solid material and the effects of stellar insolation. In contrast, we find that the models cannot account for the large size of WASP-1b, even if the planet has no core. Thus, we add WASP-1b to the growing list of hot Jupiters that are larger than expected. This suggests that inflated'' hot Jupiters are more common than previously thought and that any purported explanations involving highly unusual circumstances are disfavored.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据