Scientists May Have Located Never-Before-Seen Type of Supernova
"Follow-up radio and optical spectroscopy show that it is an expanding supernova remnant slamming into surrounding material, probably ejected from the star centuries before it exploded", an excerpt from the research said. "An unidentified x-ray transient occurred at a consistent location in 2014, suggesting an explosion at that time that produced a jet. The authors suggest that the most likely explanation is a merger-triggered supernova."
"The X-ray transient was an unusual event—it signaled that a relativistic jet was launched at the time of the explosion," said Dillon Dong, one of the study's co-authors. "And the luminous radio glow indicated that the material from that explosion later crashed into a massive torus of dense gas that had been ejected from the star centuries earlier. These two events have never been associated with each other, and on their own they're very rare."