MESA binary models demonstrate that Case C Roche-lobe overflow in 10-20 Msun donors with 1000-2700 Rsun separations produces CSM matching interacting SNe and accounts for ~13% of CCSN 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
MESA binary models demonstrate that Case C Roche-lobe overflow in 10-20 Msun donors with 1000-2700 Rsun separations produces CSM matching interacting SNe and accounts for ~13% of CCSN 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.