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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 9.

Left: Kp−Δvsys map for KELT-9 b, similar to Figure 3, but using the 12CO-only template used in Figure 4. The CO template is weakly detected at SNR ∼ 4, consistent with expectations that the atmosphere of KELT-9 b is hot enough to dissociate nearly all molecules. Right: Kp−Δvsys map for KELT-9 b, using the maximum-likelihood model from the chemical equilibrium retrieval, which is dominated by Fe emission features. This model is detected at SNR = 5 and is consistent with the known ephemeris of KELT-9 b. An Fe-dominated atmosphere is consistent with results from optical emission spectroscopy (Y. Zhang et al. 2026).

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