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The Watery Atmosphere of HD 209458 b Revealed by Joint K- and L-band High-resolution Spectroscopy

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

Luke Finnerty et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 2.

Kp–Δvsys plots for each molecule. Planet models were generated using the maximum-likelihood parameters, setting the specified mass fraction to 10−1.5 and all others to 10−15. Only H2O shows a clear peak consistent with the ephemeris of HD 209458 b. While CO, H2S, and HCN show SNR ∼ 3 peaks consistent with the planet, comparison to other molecules shows that features of comparable strength regularly appear at random locations in the Kp–Δvsys space. CO shows a strong peak at very negative Kp, which may be a result of stellar or telluric contamination.

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