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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AT 2025abao is the fourth LRN in M31, showing a plateau light curve, canonical spectroscopic evolution from hot continuum with Balmer lines to cool molecular bands, and an AGB progenitor whose IR SED is reported for the first time.
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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.
- Interacting Binary Stars as Progenitors for Interacting Supernovae