Ground- and Space-based Detection of the Thermal Emission Spectrum of the Transiting Hot Jupiter KELT-2Ab
Line, Michael R.
Knutson, Heather A.
Crockett, Nathan R.
Lockwood, Alexandra C.
Blake, Geoffrey A.
Barman, Travis S.
Johnson, John A.
AffiliationUniv Arizona, Steward Observ
Univ Arizona, Lunar & Planetary Lab
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationDanielle Piskorz et al 2018 AJ 156 133
Rights© 2018. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe 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.
VersionFinal published version
SponsorsW. M. Keck Foundation; NASA; NSF Astronomy Astrophysics; NASA Exoplanets Research Programs [AST-1109857, NNX16AI14G]; Sloan Foundation