A synchrotron forward-shock model with confined broken-power-law CSM explains FBOT radio diversity via shock transition out of the dense shell, yielding trans-relativistic velocities of 0.1-0.5c and high but brief mass-loss rates of 10^{-4} to 10^{-3} solar masses per year.
W., Panagia, N., Montes, M
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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.
citing papers explorer
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Radio Emission from Fast Blue Optical Transients Powered by Trans-relativistic Shocks in Confined Circumstellar Material
A synchrotron forward-shock model with confined broken-power-law CSM explains FBOT radio diversity via shock transition out of the dense shell, yielding trans-relativistic velocities of 0.1-0.5c and high but brief mass-loss rates of 10^{-4} to 10^{-3} solar masses per 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.