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We present mid-infrared (mid-IR) imaging of the Type IIL supernova (SN) 1980Kwith the James Webb Space Telescope (JWST) more than 40 yr post-explosion. SN1980K, located in the nearby ($D\approx7$ Mpc) "SN factory" galaxy NGC 6946,was serendipitously captured in JWST/MIRI images taken of the field of SN2004et in the same galaxy. SN 1980K serves as a promising candidate forstudying the transitional phase between young SNe and older SN remnants andalso provides a great opportunity to investigate its the close environment. SN1980K can be identified as a clear and bright point source in all eight MIRIfilters from F560W up to F2550W. We fit analytical dust models to the mid-IRspectral energy distribution that reveal a large amount ($M_d \approx 0.002{M}_{\odot}$) of Si-dominated dust at $T_{dust}\approx 150$ K (accompanied by ahotter dust/gas component), and also computed numerical SED dust models.Radiative transfer modeling of a late-time optical spectrum obtained recentlywith Keck discloses that an even larger ($\sim 0.24-0.58~{M}_{\odot}$) amountof dust is needed in order for selective extinction to explain the asymmetricline profile shapes observed in SN 1980K. As a conclusion, with JWST, we maysee i) pre-existing circumstellar dust heated collisionally (or, partlyradiatively), analogous to the equatorial ring of SN 1987A, or ii) the mid-IRcomponent of the presumed newly-formed dust, accompanied by much more colderdust present in the ejecta (as suggested by the late-time the optical spectra).

Serendipitous detection of the dusty Type IIL SN 1980K with JWST/MIRI