Retrieval posteriors for WASP-39 b differ between transmission spectra reduced from identical JWST raw data, producing stable Gaussian distributions for well-constrained species like H2O and CO2 but unstable heavy-tailed distributions for species like SO2 and C2H2.
For the background, we fit a second-order polynomial, with an out- lier rejection threshold of 5σ
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Knobs and dials of retrieving JWST transmission spectra. II. Impacts of pipeline-level differences on retrieval posteriors
Retrieval posteriors for WASP-39 b differ between transmission spectra reduced from identical JWST raw data, producing stable Gaussian distributions for well-constrained species like H2O and CO2 but unstable heavy-tailed distributions for species like SO2 and C2H2.