HIP94235b shows no detectable helium escape (mass loss below 10^11 g/s) and no detectable water absorption in two CRIRES+ transits, implying it likely lacks a large hydrogen-helium envelope.
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Searching for helium escape and a low density atmosphere around the 120 Myr old sub-Neptune HIP94235b using CRIRES+
HIP94235b shows no detectable helium escape (mass loss below 10^11 g/s) and no detectable water absorption in two CRIRES+ transits, implying it likely lacks a large hydrogen-helium envelope.