In
the latest issue of the journal Nature,
astronomers from Stockholm University reveal the origin of a thermonuclear
supernova explosion. Strong emission lines of helium and the first detection of
such a supernova in radio waves show that the exploding white dwarf star had a
helium-rich companion.
Supernovae of Type Ia are important for
astronomers since they are used to measure the expansion of the universe.
However, the origin of these explosions has remained an open question. While it
is established that the explosion is that of a compact white dwarf star somehow
accreting too much matter from a companion star, the exact process and the nature of the progenitor
is not known. The new discovery of supernova SN 2020eyj established that the companion star
was a helium star that had lost much of its material just prior to the
explosion of the white dwarf.
"Once we saw the signatures of
strong interaction with the material from the companion we tried to also detect
it in radio emission," explains Erik Kool, post-doc at the Department
of Astronomy at Stockholm University and lead author of the paper. "The
detection in radio is the first one of a Type Ia supernova—something
astronomers have tried to do for decades."
Supernova 2020eyj was discovered by the Zwicky Transient Facility camera on Palomar mountain, where the Oskar Klein Center at Stockholm University are members.
Animation of a supernova explosion. Credit: Adam
Makarenko/W. M. Keck Observatory
"The Nordic Optical telescope
on La Palma was fundamental for following up this supernova," says
Professor Jesper Sollerman at the Department of Astronomy and co-author of the
paper. "As were spectra from the large Keck telescope on Hawai'i that
immediately revealed the very unusual helium-dominated material around the exploded
star."
"This is clearly a very
unusual Type Ia supernova, but still related to the ones we use to measure the
expansion of the universe," adds Joel Johansson from the Department of
Physics.
"While normal Type Ia supernovae appear to always explode with the same brightness, this supernova tells us that there are many different pathways to a white dwarf star explosion," he adds.
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