Patricio Cubillos, Joseph Harrington, Nikku Madhusudhan, Kevin B. Stevenson, Ryan A. Hardy, Jasmina Blecic, David R. Anderson, Matthew Hardin, Christopher J. Campo
2013 Astrophysical Journal  
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 Infrared Array Camera bands. The eclipse depths are 0.113± 0.018 0.093± 0.023 1552, 1131, and 938 K. We characterized the atmospheric thermal profile
more » ... 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- brightness temperature (1552 K); by modeling the eccentricity-caused thermal variation, we found that this temperature is plausible for radiative time scales less than ∼ 10^2 hours. However, as no model spectra fit all three data points well, the temperature discrepancy remains as an open question.
doi:10.1088/0004-637x/768/1/42 fatcat:a2qonj6chvgipaw4oh6ql3yjze