This is the first time scientists have discovered type IaSupernovaEvidence of the eruption remains. Ia supernova explosions are a relatively rare phenomenon in the universe, occurring only once or twice in each galaxy in hundreds of years.MeteoriteFalling to the ground is even rarer.
Scientists in 1996Egyptian desertA small stone found was later thought to be an alien, not produced on Earth. A recent study by researchers at the University of Johannesburg in South Africa shows that this is not a typical meteorite, but may be the first physical evidence of a supernova ever seen.
A supernova explosion is one of the most energetic celestial phenomena in the universe, and in previous studies, scientists have seen the powerful energy it emits at different wavelengths, such as visible light and telescopes using telescopes. This time, for the first time, scientists saw evidence of such an event.
The researchers used a proton beamHypothesis Meteorite(Hypothesis) For analysis. The silicon content of stone is much lower than that of any substance in the Solar System, less than 1%. Moreover, the ratio of chromium, manganese, iron, sulfur, copper and vanadium contained in it does not match the laws of matter in the solar system.
“We found that many elements in the Solar System have different relative properties, both primitive and later evolved,” said John Kramer, a leading author and geochemist at the University of Johannesburg. Asteroid belt, meteorites, etc. So we began to consider the possibility that it came from outside the Solar System.
They compared the properties of celestial matter to numerous other possible sources, such as dust orbits between different galaxies in the Milky Way, red giant stars, or Type II supernova explosions. Type II supernova explosions are events in which a giant star explodes after running out of fuel. As a result, the potential of these sources was ruled out one by one.
Finally, the researchers examined the possibility that it came from a type Ia supernova. Type Ia supernova is the eruption of a white dwarf star in an orbiting binary star system. Such explosions are powerful enough to crush white dwarf matter to its atomic state. When these atoms meet and condense in the dust of the white dwarf nebula, the researchers say, there is a unique pattern to the ratio of chemicals in the newly created solid.
This study found,Hypothesis MeteoriteAlthough not 100 percent similar, a type Ia is close to the chemical composition of the internal material of the condensate from the supernova.
The research was published April 22 in the journal Planetary Science, Icarus. ◇ #
Responsible Editor: Ye Ziwei