The first HST/WFC3 transmission spectrum of sub-Neptune HD 191939 b shows no significant absorption features and is consistent with a flat line.
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The SPACE Program II: No discernible spectral features in the transmission spectrum of the sub-Neptune HD 191939 b observed with HST/WFC3
The first HST/WFC3 transmission spectrum of sub-Neptune HD 191939 b shows no significant absorption features and is consistent with a flat line.