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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Late-time radio observations of Type IIn and II-L supernovae show a range of CSM densities and mass-loss rates, with detections supporting a continuum between subtypes driven by recent dense material rather than long-term mass loss.
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JWST Nebular Spectroscopy of SN 2023qov: Circumstellar Dust Emission in a Normal Type Ia Supernova
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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Probing the Mass-loss Histories of Type IIn and II-L Supernovae with Late-time Radio Observations
Late-time radio observations of Type IIn and II-L supernovae show a range of CSM densities and mass-loss rates, with detections supporting a continuum between subtypes driven by recent dense material rather than long-term mass loss.