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.
The finding suggests that the host galaxy might be hiding a star
factory, allowing it to form massive stars where none were expected.
Alternatively, PS1-12sk might have an entirely different origin such as a
collision of two white dwarfs, one of which was helium-rich. "This
supernova is one-of-a-kind," said Nathan Sanders of the Harvard-Smithsonian Center for Astrophysics
(CfA), lead author of the discovery paper. "And it's definitely in the
wrong neighborhood."
Supernova explosions of massive stars are common in spiral galaxies like
the Milky Way, where new stars are forming all the time. They are
almost never seen in elliptical galaxies where star formation has nearly
ceased. As a result, astronomers were surprised to find a young-looking
supernova in an old galaxy. Supernova PS1-12sk, discovered with the Pan-STARRS telescope on Haleakala, is rare in more ways than one.
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
Source: The Daily Galaxy via Harvard-Smithsonian Center for Astrophysics
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