Fig. 7
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Posterior distributions of atmospheric parameters retrieved from the JWST/NIRSpec observations of TWA 27A (top row) and TWA 28 (bottom row). From left to right, the panels show the carbon-to-oxygen ratio, carbon isotope ratio and oxygen isotope ratio from H2O and CO. The vertical axis of each panel represents the posterior probability density (not shown). The oxygen-isotope homogeneity calibration is applied to TWA 27A, with the resulting posteriors indicated with an arrow. Reference values for the interstellar medium (ISM), the solar value, and literature values are shown where available. Results from JWST/NIRSpec for the planetary-mass companion of TWA 27A (Zhang et al. 2025) and for TWA 28 from HRS CRIRES+ observations (González Picos et al. 2024) are shown in grey.
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