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A Comprehensive Reanalysis of K2-18 b’s JWST NIRISS+NIRSpec Transmission Spectrum

  • Authors: Stephen P. Schmidt, Ryan J. MacDonald, Shang-Min Tsai, Michael Radica, Le-Chris Wang, Eva-Maria Ahrer, Taylor J. Bell, Chloe Fisher, Daniel P. Thorngren, Nicholas Wogan, Erin M. May, Piero Ferrari, Katherine A. Bennett, Zafar Rustamkulov, Mercedes López-Morales, David K. Sing

Stephen P. Schmidt et al 2025 The Astronomical Journal 170 .

  • Provider: AAS Journals

Caption: Figure 10.

The equilibrium abundances of H2O and CH4 as a function of C/O ratio. The shaded regions represent the range across pressures from 100–1 bar and temperatures from 800–1000 K, which cover the expected quench levels. The dashed line is the 2σ upper limit of H2O from our retrieval analysis, and the open circle with an error bar represents our retrieved 1σ CH4 abundance.

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