Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets Using Spitzer Secondary Eclipses

@article{Wallack2019InvestigatingTI,
  title={Investigating Trends in Atmospheric Compositions of Cool Gas Giant Planets Using Spitzer Secondary Eclipses},
  author={Nicole L. Wallack and Heather A. Knutson and Caroline V. Morley and Julianne I. Moses and Nancy H. Thomas and Daniel P. Thorngren and Drake L. Deming and J.-M. D'esert and Jonathan J. Fortney and Joshua A. Kammer},
  journal={The Astronomical Journal},
  year={2019},
  volume={158}
}
We present new 3.6 and 4.5 μm secondary eclipse measurements for five cool (T ≲ 1000 K) transiting gas giant planets: HAT-P-15b, HAT-P-17b, HAT-P-18b, HAT-P-26b, and WASP-69b. We detect eclipses in at least one bandpass for all planets except HAT-P-15b. We confirm and refine the orbital eccentricity of HAT-P-17b, which is also the only planet in our sample with a known outer companion. We compare our measured eclipse depths in these two bands, which are sensitive to the relative abundances of… 

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