However, can the flyby of stars really hit planets, comets and asteroids obliquely and reshape the whole planetary system? Astronomers at the University of California, Berkeley and Stanford University believe that they have now found conclusive evidence. A planet orbiting a young binary star may have been disturbed by another pair of stars too close to the system 2 to 3 million years ago, when the planet was formed by rotating disks of dust and gas.
Boko Park-Science Spectrum: If confirmed, this supports the view that not being close to stars helps to shape planetary systems and may determine whether they have planets with stable orbits. Paul Kalas, an adjunct professor of astronomy at the University of California, Berkeley, said: One of the mysteries arising from the study of exoplanets is that the arrangement of planets in the galaxies we see is incorrect, even though they were born on a flat disk. Maybe the cosmic tsunami hit these systems and rearranged everything, but we have no evidence yet. This research paper provides rare observational evidence that these overflights will slightly affect a planetary system in the Milky Way.
Astronomers have been looking for past star flybys in the solar system, but since that may be 4.6 billion years ago, most of the evidence has become cold. The star system studied by astronomers is very young, only about15 million years old, numbered HD 106906, located in the direction of the cross constellation 300 light years away from the earth. Callas and Robert De Rosa described their findings in a paper. This paper was accepted and published by astronomical magazine, and now it has been published online.
Karas studies young and newly formed planetary systems, trying to understand what happened in the early solar system. In 20 15, people found a huge planet in an unusual orbit in HD 106906. He first focused on HD 106906. This planet is named HD 106906 b, and its mass is about 1 1 Jupiter. It orbits HD 106906 (a recently discovered binary star), and its orbit is inclined by 2 1 degree from the disk where other substances around the star are located. At present, its distance from its star is at least 738 times that of the earth to the sun, or about 18 times that of Pluto to the sun.
Caras observed HD 106906 more carefully by using Gemini imager and Hubble Space Telescope located in the Andes of Chile, and found that this star also has an asymmetric comet belt. The fact that the planet's strange orbit and the dust disk itself are asymmetrical shows that something has disturbed this young system. Callas and his colleagues, including De Rosa, suggested that this planet was expelled from the solar system because it interacted with another undiscovered planet or star. Callas and de Rosa now think that both of these things happened: when the planet was dangerously close to the center of the binary star, it was kicked into an eccentric orbit.
In 20 17, Laetitia Rodet, a theorist at the Grenoble Observatory in France, and her colleagues put forward this idea. The repeated gravity of the binary star could have quickly thrown the planet into interstellar space, but the passing star saved the planet by pushing its orbit to a safer distance from the binary star. Gaia Space Observatory gave them the data they needed to verify their hypothesis. In 20 12, the European space agency launched the Gaia satellite, which accurately measured the distance, position and motion of 0/300 million stars in the Milky Way/kloc-0. Hipparcos, the predecessor of Bighea, is 10000 times larger. Caras and de Rosa collected information about 46 1 stars in HD 106906 cluster, and calculated their inversion positions in time.
In other words, the cosmic clock was reversed-another binary star system was found to be close enough to change the planetary system 3 million years ago. What we are doing here is actually looking for a star that could have brought extra gravity to HD 106906 b. The second gravity makes it live longer, just like an imaginary planet in our solar system. The researchers also found that the distance between the orbit of this binary star and the hard disk is about 5 degrees, which is more likely to have a strong and lasting impact on HD 106906. This double recoil may be important for stabilizing comets around planets, asteroids and stars. Studying the planetary system HD 106906 is like going back in time and watching Oort comet clouds form around our young sun.
The giant planets in the solar system kick countless comets into the distance through gravity. Many planets were completely ejected and became interstellar objects like Umwagua, but some planets were influenced by passing stars. The second impact of the star will separate the orbit of the comet from the collision of other planets, thus preventing it from being thrown out. This series of events has kept the most primitive material in the solar system in deep freezing far away from the sun for billions of years. Karas hopes that future observations, such as the updated Gaia survey catalogue, will clarify the significance of HD 106906 overflight. The research started from 46 1 and found two "crime" scenes. "As we collect more evidence, their exact roles will be revealed.
Boko Park-Popular Science | Research/From: University of California, Berkeley
Reference journal literature: astronomy
DOI: 10.3847/ 1538-388 1/ab 0 109
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