Case C mass transfer in binaries with 10-20 solar mass donors naturally produces the dense, nearby CSM required to power interacting supernovae and may account for 13 percent of core-collapse progenitors.
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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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Interacting Binary Stars as Progenitors for Interacting Supernovae
Case C mass transfer in binaries with 10-20 solar mass donors naturally produces the dense, nearby CSM required to power interacting supernovae and may account for 13 percent of core-collapse progenitors.
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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.