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Des chercheurs du Massachusetts Institute of Technology (MIT, États-Unis) ont repéré, dans un système planétaire, une exoplanète qui a dû connaître un impact géant il y a relativement peu de temps. © MoVille, Adobe Stock

A big impact blew the atmosphere of a young exoplanet

In its youth, our solar system was the site of the giant influences that created its image. Our solar system, and often other Milky Way planetary systems. But such an event has not yet been noticed. However, researchers are announcing today that they have found evidence that it happened.

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In new planetary systems, collisions of bodies are not uncommon. The Astronomers For example think ours நிலா Appeared about 4 billion years ago The collision of our earth With a protoplanet called the size of Mars Thea. But today, researchers say they have found evidence of such an impact on a planetary system other than ours. They go a little further by insisting that this impact, in a way, has “stripped” the extraterrestrial of its sound. Atmosphere.

The impact of the question occurred at just 95 Light years Ours The Solar System. A Star Named HD 172555. A star 23 million years old. This collision is thought to have taken place about 200,000 years ago, between the size of our Earth and one planet Impact Small, moving at no less than 36,000 kilometers per hour.

HD 172555 attracted the attention of astronomers due to the unusual structure of the dust disk around it. Surprisingly rich record Minerals And contains better grains than other circular disks that researchers are accustomed to reading. So are astronomers Massachusetts Institute of Technology (MIT, US) dug from dataAtacama large millimeter array (Alma, Chile) Looking for signs Carbon monoxide (CO) – Because it is so bright Gas – Around this funny star.

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Conflict betrayed by carbon monoxide

The researchers first confirmed the presence of CO in HD 172555. Then they measured its abundance. It is not less than 20% Carbon monoxide Is in the atmosphere Venus. This is a lot. They also noted that the gas was surprisingly close to the star. Is only 10 times the distance between our earth and the earth சோலைல். Surprisingly, CO is susceptible to photosynthesis. The Photons There is an annoying tendency to break it. So it should not appear so close at such a close distance.

The researchers then considered several scenarios. CO comes from the debris of the newly formed star. Or a Asteroid belt Close to frozen. Or even Comets From a Asteroid belt Too far. But the data did not match.

The only possibility that astronomers believe is that this carbon monoxide was produced by a massive impact that would have torn at least part of its atmosphere from a terrestrial planet. In the past the star was so close that there was no time to clear the gas. And is large enough to produce so much gas between two bodies.

Therefore, researchers conclude that the detection of CO around a star will become one of the characteristics for detecting giant impacted planetary systems. One way to finally better understand how garbage works after reality.

Spitzer detects volcanic eruptions from planetary collisions

Before the hot phase of his work began, Spitzer made a record Specter Has been strange Thing On Around the circular path Around the youngest star, HD 172555. A groupAstronomical physicists It has now been discovered that they are evaporated rocks and debris To do Pulled out of a recent confrontation between the two Small planets.

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By article Laurent Sacco Posted on 08/14/2009

Spitzer is definitely coming to the center this time, especially following a post by a team of physicists. Gary M. Lissy. Although we have already known for many years the traces left by recent asteroid collisions on planetary disks (a few million years ago), this is the first time similar remains have been found coming from but larger celestial objects.

In fact, in their publication, researchers estimate that they have HD 172555, a star 12 million years old and about 100 light-years away, at least the size of the moon that corresponds to an object coming from a titanic collision. And the size of one Wednesday.

Shock, The center of the small one must have sunk into the gut of the big one and the heat given by the impact melted the large rocks, probably the bulk of the main body that came out of the collision. Heat andEnergy Published by the latter, which a Speed 10 km Fusion To create what we know on earth Tectonics (These are fragments of rock that melted and were ejected from a crater during the impact of a Meteor)

How many times all these results Astronomy, Taken from the spectral analysis of light emitted by matter. In this case, the observationsInfrared Developed by Spitzer’s tools SiO Steam and Silicates Solid, but Imageless, The terrain is very similar to the Obsidian and of course Tectonics.

If we find more traces of rocks and dust, like the remnants of asteroid collisions already discovered by Spitzer, the presence of silicate vapors and fragments of molten rock cannot be ruled out. Explain the rapid, violent collision between two bodies of large size but not yet found on other disks forming planetary systems.

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Astronomers and astronomers are trying to understand evolution The Solar System This is an important discovery because we know that conflicts like these will not be rare at the beginning of this history. Our moon is coming from one Conflict Between a proto-Earth and a celestial body the size of Mars Thea. Venus has a rotation against the other planets in the solar system and Uranus has a strong inclination of its axis (approximately 90) probably due to the primitive shock with a smaller planet.

The moon may be currently orbiting the main planet. Next generations Telescopes We need to teach more.

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