Unshocked SN ejecta dominate evolving FRB local DM (DM∝t^{-1.8–1.9}); matching observed dDM/dt implies tens–hundreds pc cm^{-3} of SNR DM_source and GHz transparency by ≲70 yr.
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Probing the Dispersion and Rotation Measure Contributions from Supernova Remnants in Fast Radio Burst Source Environments with 1D SNR Simulation
Unshocked SN ejecta dominate evolving FRB local DM (DM∝t^{-1.8–1.9}); matching observed dDM/dt implies tens–hundreds pc cm^{-3} of SNR DM_source and GHz transparency by ≲70 yr.