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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 9.

Self-consistent mini-Neptune models of K2-18 b’s atmosphere. Upper panel: 100× solar metallicity case. Lower panel: the same metallicity, but with 5000 × nitrogen depletion. The temperature (black lines) and composition profiles (colored lines) from VULCAN-HELIOS (solid lines) and Photochem-PICASO (dashed lines) with the 1σ CH4 range (orange bar) and 95% upper limits for other molecules (arrows).

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