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Alam, N\\'estor Espinoza, Patrick McCreery, Romain Allart, Vincent Bourrier","submitted_at":"2024-05-27T15:59:34Z","abstract_excerpt":"We search for excess in-transit absorption of neutral helium at 1.083 $\\mu$m in the atmospheres of the young (<800 Myr) sub-Jovian (0.2-0.5 $\\rm R_{J}$) planets HD 63433b, K2-100b, and V1298 Tau c using high-resolution (R~25,000) transit observations taken with Keck II/NIRSPEC. Our observations do not show evidence of helium absorption for any of the planets in our sample. We calculate 3$\\sigma$ upper limits on the planets' excess helium absorption of <0.47% for HD 63433b, <0.56% for K2-100b, and <1.13% for V1298 Tau c. 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