The first NIRSpec G395H transmission spectrum of GJ 357 b is featureless, ruling out low mean molecular weight atmospheres at 3-sigma and pointing to a bare rock or a high molecular weight secondary atmosphere.
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JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b
The first NIRSpec G395H transmission spectrum of GJ 357 b is featureless, ruling out low mean molecular weight atmospheres at 3-sigma and pointing to a bare rock or a high molecular weight secondary atmosphere.