Extended Data Fig. 8: Corner plot showing the 1D and 2D marginalized posterior probability distributions from the POSEIDON retrieval using CLR mixing ratio parameters. | Nature Astronomy

Extended Data Fig. 8: Corner plot showing the 1D and 2D marginalized posterior probability distributions from the POSEIDON retrieval using CLR mixing ratio parameters.

From: A JWST transmission spectrum of the nearby Earth-sized exoplanet LHS 475 b

Extended Data Fig. 8: Corner plot showing the 1D and 2D marginalized posterior probability distributions from the POSEIDON retrieval using CLR mixing ratio parameters.The alternative text for this image may have been generated using AI.

The units are: Rp, ref (R⊕), g (cm s−2), Psurf (bar), and T (K). The inset shows the corresponding retrieved transmission spectrum model (1σ and 2σ confidence regions) compared to the NIRSpec G395H observations. The error bars are 1-σ standard deviations. The solution rules out H2-dominated atmospheres (to > 5σ) and thick atmospheres (Psurf ≳ 10 mbar) dominated by CH4 (to 3σ).

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