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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 8.

Influence of stellar contamination on K2-18 b retrievals. Top: two POSEIDON retrieval models for the low-resolution FIREFLy data variant, one including a planetary atmosphere and stellar contamination (orange) and an alternative atmosphere-only model (purple). Bottom: corresponding posterior distributions for the CH4, CO2, and DMS abundances. The inferred atmospheric composition is insensitive to whether or not stellar contamination is included.

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