期刊
ASTROPHYSICAL JOURNAL
卷 768, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/768/1/42
关键词
planetary systems; stars: individual (WASP-8); techniques: photometric
资金
- Fulbright Program for Foreign Students
- Yale Center for Astronomy and Astrophysics through the YCAA postdoctoral fellowship
- NASA
- NASA through JPL/Caltech
- NASA through Astrophysics Data Analysis Program [NNX13AF38G]
WASP-8b has 2.18 times Jupiter's mass and is on an eccentric (e = 0.31) 8.16 day orbit. With a time-averaged equilibrium temperature of 948 K, it is one of the least-irradiated hot Jupiters observed with the Spitzer Space Telescope. We have analyzed six photometric light curves of WASP-8b during secondary eclipse observed in the 3.6, 4.5, and 8.0 mu m Infrared Array Camera bands. The eclipse depths are 0.113% +/- 0.018%, 0.069% +/- 0.007%, and 0.093% +/- 0.023%, respectively, giving respective brightness temperatures of 1552, 1131, and 938 K. We characterized the atmospheric thermal profile and composition of the planet using a line-by-line radiative transfer code and a Markov-chain Monte Carlo sampler. The data indicated no thermal inversion, independently of any assumption about chemical composition. We noted an anomalously high 3.6 mu m brightness temperature (1552 K); by modeling the eccentricity-caused thermal variation, we found that this temperature is plausible for radiative timescales less than similar to 10(2) hr. However, as no model spectra fit all three data points well, the temperature discrepancy remains as an open question.
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