Scientists have found the star just before the explosion; it looks completely different than they expected – Universe – Science and Technology

The Hubble telescope revealed that a relatively cold, low-density star exploded like a supernova that showed no signs of hydrogen.

The Hubble Space Telescope took pictures of the star just before it exploded, known as a supernova. However, scientists were given a look they did not expect at all, the American magazine reported on Thursday Science News.

The Hubble telescope revealed that a relatively cold, low-density star exploded like a supernova that showed no signs of hydrogen. Until now, however, scientists have hypothesized that such “hydrogen-free supernovae” can only form from extremely hot and dense stars.

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The discovery is “a very important test case for star evolution,” said Sung-Chul Jun, an astrophysicist at Seoul State University. Scientists have theories about how massive stars behave before they explode, but such bodies are rare in the surrounding universe, and none of them are going to explode in the foreseeable future, Sung-Chul Jun added.

However, it is difficult to find the stars that exploded, said astronomer Charlie Kilpatrick, who works at Northwestern University in Evanstone, Illinois. In the past, the telescope first had to take pictures of exactly the part of the sky where the supernova then exploded. In addition, a star that was close enough for its pre-explosion light to travel to Earth must have exploded.

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After scientists discovered a supernova in the galaxy NGC 4666 about 46 million light-years away in December 2019, Kilpatrick and his colleagues found an old image of a star that probably exploded. This star, photographed about 2.6 years before the explosion, had a diameter 320 times larger than the Sun and a temperature of 6500 degrees Celsius. However, since the SN 2019yvr supernova did not contain hydrogen, scientists expected the star itself to be deficient and thus extremely hot (10,000 – 50,000 degrees Celsius) and much smaller – at most 50 times larger than the Sun. The star, which scientists found, had to somehow get rid of most of its hydrogen before its explosion, Kilpatrick believes.

Scientists have several possible explanations in this regard. The star could lose much of its hydrogen either through massive explosions caused by some instability in its core or by the impact of another cosmic body. Hydrogen from an exploded star could also be released by interference with another star in its vicinity.

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As Jan Eldridge, an astrophysicist at the University of Auckland in New Zealand, suggested that scientists could point the Hubble telescope at the site of the explosion again to see if the star had actually exploded, or to determine if another star was orbiting it.


Source: Pravda.sk – Veda a technika by vat.pravda.sk.

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