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An asteroid escaping a dying star gives clues about our solar system

How does the solar system die? It is a very important question that researchers have guessed a lot to create complex theoretical models using our knowledge of physics. We know that the sun will eventually become the “sun”White dwarf”, A remnant of burnt stars, whose dark light gradually fades into darkness. This transformation involves a violent process that destroys a number of unknown planets.

So which planet will survive the death of the sun? One way to find the answer is to look at the fate of other similar planetary systems. However this has proven to be difficult. The weak radiation of white dwarfs makes it difficult to identify planets (planets around stars other than our own Sun) that have escaped this stellar transformation – they are in the absolute darkness of the word.

Of course, over 4,500 extraterrestrial planets Only a handful of white dwarfs known to date have been found – according to the location of these planets, they appear to have arrived after the star’s death.

This lack of data paints an incomplete picture of our own planetary destiny. Fortunately, we are now filling in the gaps. Published in our new pamphlet In natureWe report the discovery of the first living planets after the death of their star, moving a distance comparable to that of the planets between the Sun and the Solar System.

A planet like Jupiter

This is the new planet we discovered Cake Observatory In Hawaii, Jupiter resembles both mass and orbital separation, giving us a concise picture of survivors from planets around dying stars. A star is a so-called “red giant” that inflates into a violent phase of transformation into a white dwarf.Giant branchThe star is a hundred times bigger than before. We believe that the Explanet survived: if it had been closer to its original parent star, it would have sunk due to the star’s expansion.

When the Sun finally becomes a red giant, its radius actually reaches out to Earth’s current orbit. This means that the Sun (perhaps) will sink Mercury and Venus and perhaps the Earth – but we are not sure.

Jupiter and its moons are expected to survive, but we did not know for sure. But with the discovery of this new planet, we can now be more sure that Jupiter will realize it. Moreover, the visible boundary of the planet’s position means that it is currently about half the size of Jupiter’s white dwarf. If so, Jupiter and Mars are additional evidence to assume that it will.

So can any living thing survive this transformation? A white dwarf can give life to moons or planets in the first few billion years and end very closely (about one tenth of the distance between the Sun and Mercury). After that, there is not enough radiation to sustain anything.

Asteroids and white dwarfs

Planets orbiting white dwarfs are hard to find, but there are some that are easy to spot Asteroid rupture Close to the surface of the white dwarf. For exosteroids to be so close to a white dwarf, they must be given sufficient speed to survive on Earth. Therefore, it has long been assumed that exosteroid planets are also present.

Our finding ultimately confirms this. Current technology does not allow us to see exosteroids in the system discussed in the paper, but at least for now we can put together different parts of the planetary destiny puzzle by combining evidence from different white dwarf systems.

The relationship between exosteroids and explons also applies to our own solar system. Individual objects in the asteroid belt and the Kuiper belt (a disk of the outer solar system) may escape the Sun’s death, but some of them run towards the white dwarf surface by gravity.

Expectations of future discoveries

Discovered the new white dwarf Explanet with what is called Method of detection of microscopy. It looks at how light bends due to a strong gravitational field that occurs when a star aligns for a moment with a star that is farther from the star as seen from Earth.

The gravitational pull of the foreground star magnifies the light of the star behind it. Any asteroid orbiting a star will bend and distort this magnifying light so that we can detect it. A quarter of the center of the white dwarf Milky Way galaxy we have examined, or 6,500 light-years from our solar system, is in the center of the most star galaxy.

The main feature of microscopy technology is that it is sensitive to planets orbiting distant stars between Jupiter and the Sun. Other known planets orbiting white dwarfs have been discovered by various technologies that are sensitive to different stellar planetary separations. Two examples of planets that turned a star into white dwarfs and survived, and even more closely. Discovered by one Transitional photography – A method of recognizing planets as they move in front of a white dwarf that causes a drop of light to reach Earth – The other was discovered by discovery. The evaporating atmosphere of the Earth.

Another detection technology – AstronomyThe motion of white dwarfs in the sky is accurately measured – and predicted to give results. Astronomy in a few years Operation Gaya It is expected to find about a dozen planets orbiting white dwarfs. Perhaps these could provide better evidence of how the solar system dies.

These diverse discovery technologies will help us to make future discoveries that will help us gain a better understanding of the fate of our own planet. But now a newly discovered planet like Jupiter provides a clear vision of our future.Conversation

By the article Dmitry Virus, Assistant Professor and Member of STFC Ernest Rutherford Astronomy University of Warwick

This article was republished Conversation Under a creative general license. read out Original article.

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