Journal
ASTRONOMICAL JOURNAL
Volume 156, Issue 3, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/aad781
Keywords
planets and satellites: atmospheres; techniques: spectroscopic
Categories
Funding
- W. M. Keck Foundation
- NASA
- NSF Astronomy Astrophysics
- NASA Exoplanets Research Programs [AST-1109857, NNX16AI14G]
- Sloan Foundation
- NASA [NNX16AI14G, 903345] Funding Source: Federal RePORTER
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We describe the detection of water vapor in the atmosphere of the transiting hot Jupiter KELT-2Ab by treating the star-planet system as a spectroscopic binary with high-resolution, ground-based spectroscopy. We resolve the signal of the planet's motion with deep combined flux observations of the star and the planet. In total, six epochs of Keck NIRSPEC L-band observations were obtained, and the full data set was subjected to a cross-correlation analysis with a grid of self-consistent atmospheric models. We measure a radial projection of the Keplerian velocity, K-p, of 148 +/- 7 km s(-1), consistent with transit measurements, and detect water vapor at 3.8 sigma. We combine NIRSPEC L-band data with Spitzer IRAC secondary eclipse data to further probe the metallicity and carbon-to-oxygen ratio of KELT-2Ab's atmosphere. While the NIRSPEC analysis provides few extra constraints on the Spitzer data, it does provide roughly the same constraints on metallicity and carbon-to-oxygen ratio. This bodes well for future investigations of the atmospheres of non-transiting hot Jupiters.
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