Comparing Gaussian and split-normal likelihoods in retrievals of simulated WASP-39b spectra shows the Gaussian assumption is safe at current JWST asymmetry levels but would bias results if asymmetries grow toward 80% or more.
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Investigating the Influence of Asymmetric Errors on Retrievals of Exoplanet Transmission Spectra
Comparing Gaussian and split-normal likelihoods in retrievals of simulated WASP-39b spectra shows the Gaussian assumption is safe at current JWST asymmetry levels but would bias results if asymmetries grow toward 80% or more.