The fastest star "roars" 2285 kilometers per second

Science and Technology Daily, Beijing, June 15 (Reporter Liu Xia) According to a report on the website of the British New Scientist on the 14th, scientists from Harvard University in the United States found in a new study that a White dwarf is the fastest moving star in the Milky Way known so far, with a speed of 2285 kilometers per second. This discovery can explain how some supernovae were formed

Science and Technology Daily, Beijing, June 15 (Reporter Liu Xia) According to a report on the website of the British New Scientist on the 14th, scientists from Harvard University in the United States found in a new study that a White dwarf is the fastest moving star in the Milky Way known so far, with a speed of 2285 kilometers per second. This discovery can explain how some supernovae were formed. The relevant paper has been submitted to the preprint website.

Type Ia supernova is very bright, and astronomers use it as a Geodetic datum to estimate the distance between stars and galaxies. A supernova is born when a White dwarf "eats" material from a nearby star, causing it to become more and more massive, and eventually becomes overwhelmed and explodes. However, the simulation shows that when two White dwarf "dance" with each other and collide, this supernova explosion may also occur. White dwarf are small in size and dense, and can orbit each other closer than any other type of stars. When one of the White dwarf explodes, the other will be pushed away at high speed.

In the latest research, the Harvard University team used the star catalog of the European Space Agency's Gaia satellite probe to identify four extremely fast White dwarf and obtain relevant evidence. Gaia accurately measured the position, distance from Earth, and motion of stars.

The moving speed of the four White dwarf exceeds 1000 km/s, and the speed of one of them reaches 2285 km/s, which is the highest speed of a star known to move freely.

The research team estimates that the supernovae generated in such collisions may account for half of all type Ia supernovae, but it needs to find more and faster moving White dwarf to determine.

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