Statistical Characterization of Hot Jupiter Atmospheres using Spitzer's Secondary Eclipses

摘要: We report 78 secondary eclipse depths for a sample of 36 transiting hot Jupiters observed at 3.6- and 4.5 microns using the Spitzer Space Telescope. Our results 27 these planets are new, include highly irradiated worlds such as KELT-7b, WASP-87b, WASP-76b, WASP-64b, important targets JWST WASP-62b. find that WASP-62b has slightly eccentric orbit e cos(omega) = 0.00614 +/- 0.00058, we confirm eccentricity HAT-P-13b WASP-14b. The remainder individually consistent with circular orbits, but statistical evidence increasing orbital period in our range from 1 to 5 days. day-side brightness temperatures yield information on albedo heat redistribution, following Cowan Agol (2011). Planets having maximum day side exceeding ~ 2200K zero distribution stellar irradiance uniformly over hemisphere. most intriguing result is detect systematic difference between emergent spectra compared blackbodies. ratio temperatures, Tb(4.5)/Tb(3.6), increases equilibrium temperature by 98 26 parts-per-million per Kelvin, entire (800K 2500K). No existing model predicts this trend large temperature. suggest may be due structural atmospheric profile real planetary atmospheres models.