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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 12.

Atmospheric composition over time for a hycean scenario for K2-18 b. Upper panel: the steady-state composition profiles computed by VULCAN in our hycean scenario. Lower panel: the composition evolution at 0.1 bar. The red arrow corresponds to the 2σ upper limit of CO2 from our retrievals, while the dashed line indicates the CO2 abundance required to produce a potentially detectable (∼100 ppm) transmission feature at 4.2 μm.

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