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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 15.

Reproduction of the results from N. Madhusudhan et al. (2023) using their full-resolution NIRISS + NIRSpec data. Retrieval results are overplotted for three retrieval models: (i) with no offset between NIRISS and NIRSpec (blue), (ii) an offset between NIRISS and NIRSpec (orange), and (iii) two offsets, one between NIRISS and NIRSpec G395H NRS1 and one between NIRISS and NIRSpec G395H NRS2 (violet). The statistically favored retrieval model has a single offset. Our POSEIDON retrieval framework produces consistent results with N. Madhusudhan et al. (2023) when using the same priors and data. Any differences in detections for our other retrievals are therefore due to differences in data reduction rather than differences inherent to our retrieval approach.

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