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Gargantuan flash from a supernova is now a cosmic mystery



White dwarf stars have been doing some weird things lately. There was one that came out of the way of the half-burned Milky Way, and now a white grandmother who has gone supernova has been found to have emitted a monstrous and mysterious UV flash.

This is not your typical supernova. Whatever it is, as it has not yet had a name, the phenomenon of a white dwarf exploding in UV light is so rare that this is only the second time it has ever been observed. No one knows exactly how or why it happens so far. Discovering what flashing like this can help reveal even darker secrets, from how the universe creates heavy metals to the cosmic acceleration thought to be caused by dark energy. Astrophysicist Adam Miller of Northwestern University and his team of researchers may be able to find it.

“These are some of the most common explosions in the universe,”

; Miller, who recently published a study on the Internet The Astrophysical Journal, said in a press release. “But what’s special is this UV flash. Astronomers have been looking for it for years and never found it.”

Surely there is something abnormal about this cosmic outbreak (now known as SN2019yvq). Type Ia (one-A) supernovae are the typical way of distant white nanny systems entering the neck of their death, although they don’t always end up what they started. Many are also superluminous and the most beautiful supernovae known to occur. The white dwarfs made of carbon and oxygen keep a star feed falling until they reach a limit at which they end up exploding – the Chandrasekhar Limit of 1.4 solar masses. It is believed to be the maximum mass a white dwarf can reach without crashing into a neutron star or black hole.

The first human eyes caught the strange supernova the day after it exploded. Using the Zwicky Transitional Facility in California, the researchers were able to say it happened right next to the constellation Draco, and astrophysicists then looked more closely at X-rays and UV waves. at NASA’s Swift Neil Gehrels Observatory. SN2019yvq was initially classified as type Ia. Almost passed for one, but the intense UV emission could not be ignored. This was not a flash that was still bright. This lasted several days, meaning that something that was not very hot had to be in or at least close to the dying star. Except cool white dwarfs as they fail.

This intense UV light needs something at least three or four times warmer than the sun to generate it. It is invisible to us because UV wavelengths are too short for our eyes to process, and X-rays have an even shorter wavelength. Previously, another team of researchers had found ways to determine the characteristics of superluminous supernovae using this type of light. Computer simulations that showed the event at UV wavelength is how the mechanism of explosion behind it was determined, and that method can be used to identify mechanisms of explosion in the middle of another supernova. This goes beyond that.

“Most supernovae aren’t that hot, so you don’t have very intense UV radiation. Something unusual has happened to this supernova that creates a very hot phenomenon,” Miller said.

Miller has four hypotheses about how this can happen. The dying white dwarf may have slowly suppressed gas and dust from supernova Ia, which exploded when it exceeded the limit, and the exploding star collided with the other star in its binary system. UV flash. Maybe there was a superhot radioactive material in its core that warmed the outer shell that shed the point of no return. Chances are the helium was the one that drastically raised the star’s temperature so high that the resulting double explosion also emitted the UV flash. Finally, it is possible the immense amount of UV radiation lit in the cosmos when the two white dwarfs in the star system merged and the remnants of the explosion collided.

What actually caused these special effects of real-life movies could reveal itself in about a year, according to Miller. Ejecta travels further and further from the source until the core of the explosion is exposed. Activate suspense.


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