The young planet V1298 Tau b has a clear H/He atmosphere with low metallicity, a 12 to 15 Earth-mass mass, and a methane deficit that requires either a hot interior or a metallicity gradient.
We do not find significant offset between NRS1 and NRS2 however we find∼400 ppm offset between HST and JWST
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A metal-poor atmosphere with a hot interior for a young sub-Neptune progenitor: JWST/NIRSpec transmission spectrum of V1298 Tau b
The young planet V1298 Tau b has a clear H/He atmosphere with low metallicity, a 12 to 15 Earth-mass mass, and a methane deficit that requires either a hot interior or a metallicity gradient.