Search for H3+ isotopologues toward CRL 2136 IRS 1 Miwa Goto, Thomas R. Geballe, Jorma Harju, Paola Caselli, Olli Sipilä, Karl M. Menten and Tomonori Usuda A&A, 632 (2019) A29 Published online: 22 November 2019 DOI: 10.1051/0004-6361/201936119