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Atmospheric Characterization of Six Ultrahot Jupiters from K-band High-resolution Spectroscopy

  • Authors: Luke Finnerty, Michael P. Fitzgerald, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Shubh Agrawal, Ashley Baker, Randall Bartos, Geoffrey A. Blake, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Daniel Echeverri, Katelyn Horstman, Chih-Chun Hsu, Nemanja Jovanovic, Joshua Liberman, Ronald A. López, Dimitri Mawet, Evan Morris, Jacklyn Pezzato-Rovner, Jean-Baptiste Ruffio, Ben Sappey, Tobias Schofield, Andrew Skemer, J. Kent Wallace, Nicole L. Wallack, Jason J. Wang, 劲飞 王, Ji Wang, 吉 王

Luke Finnerty et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 6.

Planet-to-star flux ratios for the free retrieval maximum-likelihood (purple), free retrieval median (green), equilibrium maximum-likelihood (cyan), and equilibrium median (yellow) planet models, compared with a blackbody (dashed blue). Observed NIRSPEC orders are shaded. All retrieved spectra except KELT-9 b are dominated by emission from the 12CO ν = 2–0 band beyond 2.3 μm, with features from mostly H2O or OH in the three bluest orders. In contrast, the retrieved KELT-9 b spectra are dominated by H2O emission, with contributions from the 13CO at longer wavelengths.

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