Some planets keep their star young

It seems that the stars also have an anti-aging trick and can stay young by having family or in other words suitable planets. Some planets keep their star young

It seems that the stars also have an anti-aging trick and can stay young by having family or in other words suitable planets.

Astrologers They discovered that the presence of a planet of the right size orbiting its parent star fast enough seems to slow down the star's aging process. In particular, a gas giant orbiting close to the central star can transfer angular momentum to the star's rotation process, thus counteracting the gradual decrease in rotation speed due to the star's magnetic field.

Investigating the effect Exoplanets orbit their host stars a little harder. If you look at just one star and one planet, there's still no way to know if the star's rotation rate has been affected by the planet.

Binary Stars

But many stars in the universe They are located in multi-star systems and their motion is easier to understand. For example, binary stars are usually twin stars that are born in a nebula from a mass of dust and gas. As such, their properties are often very similar to each other, and they have the same color, size, brightness, and of course the same rotation process.

According to the article published in the Monthly Notices of the Royal Astronomical Society Astronomical Society) A team of astronomers led by Nikoleta Ilic from the Leibniz Institute for Astrophysics Potsdam (AIP) in Germany focused on binary stars to more closely examine the influence of planets on the rotation and activity of stars.

They looked for binary star systems in which one star has a planet and the other does not, to use as a benchmark for finding possible changes in the planet orbiting the other star. But to create a pattern, it is not enough to study a star system alone, so in this study 34 binaries were examined. Impressions are subjective, you need a lot of patients. The same could be true in astronomy, and this study gives us confidence that these hot Jupiter-type exoplanets really do make their parent stars act younger than they are.

Hot Jupiter

Hot customers are weird orbs. These gas giants are like the planet Jupiter in the solar system, but they are incredibly close to their host stars and their orbits last only a few days or even a few hours, and this proximity to the star causes them to become extremely hot.

  • Discovering a Hot Jupiter That Lasts Only 18 Hours Every Year

Illich and his colleagues analyzed the X-ray data of these 34 binary systems by NASA's Chandra Observatory was prepared, they checked, and because the X-ray activity of faster-rotating stars is greater than that of slower-rotating stars, scientists were able to detect the difference in the rotation rates of the stars in each binary system.

Sure. Faster stars were those with hot Jupiters, and giants orbiting farther from their star, such as Jupiter around the Sun, had no visible effects. But on the other hand, because the rotation of stars slows down over time, younger stars also rotate faster than older stars with similar properties.

This comparison shows that hot Jupiters are like anti-wrinkle cream They work for the stars. The interaction between the star and the exoplanet leads to the transfer of rotation from the exoplanet to the star and increases its rotation speed.

The exact details of this interaction are still not completely clear. For their analysis, the researchers assumed that this interaction was tidal due to the gravity between the two masses. But magnetic forces can also play a role, so further research will help uncover the properties of this complex.

AIP astronomer Marzieh Hosseini noted in this regard: "In previous cases, many points It was interesting, but now we finally have statistical evidence that some planets actually influence their stars and keep them young. It is hoped that future studies will help discover more systems to better understand this effect.

Cover photo: A graphic representation of a hot Jupiter close to its parent star in a binary system
Credit: NASA/ CXC/M. Weiss

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