The football-shaped elliptical galaxy near the center of this image hosted a surprising supernova last year. PS1-12sk, the yellow dot at image center, is classified as a very rare Type Ibn supernova - only the sixth such example found out of thousands of supernovae. A Type Ibn supernova is thought to come from the explosion of a young, massive star. However, the site of the explosion shows no signs of recent star formation, and a supernova from a massive star has never before been seen in a galaxy of this type.
It was discovered on the outskirts of this bright elliptical galaxy (the yellow blob to the upper left of the supernova). Although the origin of this supernova type is unclear, the most likely cause seems to be the explosion of a massive star that previously ejected massive amounts of helium gas, much like Eta Carinae's Homunculus Nebula. That origin was supported by the fact that the five previous Type Ibn supernovae were all found in galaxies like the Milky Way that are actively forming stars. (Since massive stars don't live long, they don't stray far from where they are born before exploding.)
"It could be that we simply got very lucky with this discovery. But luck favors the prepared," said second author Alicia Soderberg of the CfA.
"Is this a runaway star from another star formation site? Is it a very local bit of star formation? Is it a different way for such a supernova to occur? None of these seems very likely so we have a real puzzle," said co-author John Tonry (University of Hawaii Institute for Astronomy). The research has been submitted for publication in The Astrophysical Journal.
For more information: pan-starrs.ifa.hawaii.edu/public/ Journal reference: Astrophysical Journal
The Daily Galaxy via Harvard-Smithsonian Center for Astrophysics