Resurrection of type IIL supernova 2018ivc: Implications for a binary evolution sequence connecting hydrogen-rich and -poor progenitors

Understand

Long-term observations of synchrotron emission from supernovae (SNe), covering more than a year after the explosion, provide a unique opportunity to study the poorly-understood evolution of massive stars in the final millennium of their lives via changes in the mass-loss rate.

• Here, we present a result of our long-term monitoring of a peculiar type IIL SN 2018ivc, using the Atacama Large Millimeter/submillimeter Array (ALMA).
• Following the initial decay, it showed unprecedented rebrightening starting at ~ a year after the explosion.
• This is one of the rare examples showing such rebrightening in the synchrotron emission, and the first case at millimeter wavelengths.