Researchers have been trying for decades to use radio signals to detect the origins of a special type of supernova, and now they've managed to pull it off.
While much of the donor material in Type Ia supernova accretes to the white dwarf, it is suspected that not all of it gets pulled onto the white dwarf. It's theorized that a cloud of circumstellar material from the donor star will form around the two stars.
When the white dwarf explodes in a supernova, it has long been suspected that it should create shockwaves in this cloud, which would excite the atoms in the cloud and produce radio waves that astronomers will be able to detect. This is principally what the researchers found in SN 2020eyj. One of the key insights for finding the radio signal came from the study of the material surrounding the explosion source.
“Once we saw the signatures of strong interaction with the material from the companion we tried to also detect it in radio emission”, said the paper's lead author, Erik Kool, a post-doctoral researcher at the SU's Department of Astronomy. “The detection in radio is the first one of a Type Ia supernova – something astronomers have tried to do for decades.”
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