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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 1.

JWST NIRISS SOSS data and white light-curve fit for K2-18 b from the FIREFLy reduction. Left: first-order data. Right: second-order data. The photometric data points (points, top panels) are compared with the best-fit light curve (green lines), resulting in a 124 ppm residual scatter for order 1 and 414 ppm for order 2 (bottom panels). Integrations during a spot-crossing event are highlighted (brown points), which are trimmed in the white and spectroscopic light-curve fits.

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