Abstract
Abstract We report the non-detection of excess absorption in the 1083.2 nm line of neutral triplet helium during a transit of K2-136c, a 2.9R ⊕ planet on a 17.3 days orbit around a K-type dwarf in the 650 Myr old Hyades cluster. We limit the equivalent width of any transit-associated absorption in the He i line to <25 mÅ at 99% confidence.
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