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Stritzinger, M. Lundquist, M. M. Phillips, M. Shahbandeh, M. Shrestha, N. B. Suntzeff, N. E. Meza Retamal, N. Morrell, O. Fox, P. Hoeflich, P. J. Brown, P. Mazzali, S. Kumar, S. Stangl, S. Valenti, T. B. Mera Evans, T. de Jaeger, Y. Dong, Y. Yang","submitted_at":"2023-10-13T14:48:23Z","abstract_excerpt":"We present a JWST mid-infrared spectrum of the under-luminous Type Ia Supernova (SN Ia) 2022xkq, obtained with the medium-resolution spectrometer on the Mid-Infrared Instrument (MIRI) $\\sim130$ days post-explosion. We identify the first MIR lines beyond 14 $\\mu$m in SN Ia observations. We find features unique to under-luminous SNe Ia, including: isolated emission of stable Ni, strong blends of [Ti II], and large ratios of singly ionized to doubly ionized species in both [Ar] and [Co]. 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