期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 419, 期 2, 页码 1248-1253出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2011.19784.x
关键词
methods: data analysis; methods: observational; techniques: photometric; stars: individual: WASP-13; planetary systems
资金
- UK Science and Technology Facilities Council
- STFC [ST/K001620/1, ST/J000027/1, ST/F002270/1, ST/I00016X/1, ST/I001719/1, ST/H002391/1, ST/I001123/1, ST/K006126/1, PP/E001149/1, ST/G009465/1, ST/J001465/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K006126/1, ST/F002270/1, ST/G009465/1, ST/I001123/1, ST/K001620/1, PP/E001149/1, ST/J000027/1, ST/I001719/1, ST/H002391/1, ST/I00016X/1, ST/J001465/1] Funding Source: researchfish
WASP-13b is a sub-Jupiter mass exoplanet orbiting a G1V type star with a period of 4.35 d. The current uncertainty in its impact parameter (0 < b < 0.46) results in poorly defined stellar and planetary radii. To better constrain the impact parameter, we have obtained high-precision transit observations with the rapid imager to search for exoplanets (RISE) instrument mounted on 2.0-m Liverpool Telescope. We present four new transits which are fitted with a Markov chain Monte Carlo routine to derive accurate system parameters. We found an orbital inclination of 85.2 +/- 0.3 resulting in stellar and planetary radii of 1.56 +/- 0.04 R circle dot and 1.39 +/- 0.05RJup, respectively. This suggests that the host star has evolved off the main sequence and is in the hydrogen-shell-burning phase. We also discuss how the limb darkening affects the derived system parameters. With a density of 0.17 rho J, WASP-13b joins the group of low-density planets whose radii are too large to be explained by standard irradiation models. We derive a new ephemeris for the system, T0= 245 5575.5136 +/- 0.0016 (HJD) and P= 4.353 011 +/- 0.000 013 d. The planet equilibrium temperature (Tequ= 1500 K) and the bright host star (V= 10.4 mag) make it a good candidate for follow-up atmospheric studies.
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