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The Cosmic Companion
That is the place the story will get scorching
In December 2019, astronomers on the Zwicky Transient Facility (ZTF) in California noticed a supernova they dubbed SN2019yvq. Evaluation of the information revealed this was a kind Ia [one A] supernova, a fairly-common kind of explosion for white dwarf stars. Happening roughly 140 million gentle years from Earth, this occasion was seen close to the tail of the constellation Draco.
“These are a number of the commonest explosions within the universe. However what’s particular is that this UV flash. Astronomers have looked for this for years and by no means discovered it. To our information, that is really solely the second time a UV flash has been seen with a kind Ia supernova,” Miller mentioned.
The manufacturing of ultraviolet gentle normally suggests processes taking place at temperatures a number of occasions hotter than the floor of the Solar. This show lasted for a number of days, suggesting an energetic process prompted this uncommon flash.
Nonetheless, white dwarfs normally develop into cooler over time, confounding researchers. Presently, astrophysicists have a number of theories on why these white dwarf stars often produce flashes of ultraviolet gentle earlier than exploding.
Some stars in binary methods would possibly eat materials from its associate star till it builds as much as a essential mass and explodes. Expelled materials from the eruption might race outwards, colliding with the companion star, producing the ultraviolet flash.
One other risk is that radioactive materials within the core of the white dwarf would possibly combine with the outer layers of the star, elevating the floor temperature to a spread the place it radiates in ultraviolet gentle.
A 3rd concept holds that helium ignites thermonuclear reactions in carbon inside the star, leading to a double explosion producing the ultraviolet flash.
One other risk is that the ultraviolet radiation comes from materials ejected by the collision of a pair of white dwarfs.