JWST nebular spectra detect cooling ~400 K carbonaceous dust emission in normal SN Ia 2023qov at +276 and +363 days, modeled as pre-existing circumstellar dust with mass ~10^{-4} M_sun located within ~1 light year.
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@doi [ ] 10.1086/186970, https://ui.adsabs.harvard.edu/abs/1993ApJ...413L.105P 413
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