Keck/NIRSPEC observations find no metastable helium absorption from TOI-4010 b, c, or d, placing 95% upper limits on mass loss that challenge standard 1D solar-composition photoevaporation predictions.
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Stringent Upper Bounds on Atmospheric Mass Loss from Three Neptune-Sized Planets in the TOI-4010 System
Keck/NIRSPEC observations find no metastable helium absorption from TOI-4010 b, c, or d, placing 95% upper limits on mass loss that challenge standard 1D solar-composition photoevaporation predictions.