Found a planet that ages its star




New research has shown that a massive exoplanet ages its parent star , gradually destroying its magnetic field. As a result, the star does not behave according to age. According to scientists, it feels older than it actually is.

WASP-18b – extreme exoplanet. This is one of the most massive hot Jupiters known to science, as well as one of the most closely spaced objects to its star. She behaves in an unexpected way. Planet makes his star to age prematurely, – says the study’s lead author Ignazio Pillitteri from the National Institute of Astrophysics in the Italian city of Palermo.

Star WASP-18, located at a distance of about 330 light years from Earth, has a mass approximately equal to the mass of the Sun. Gas giant WASP-18b, in turn, to more than 10 times as massive as Jupiter. The planet completes one orbit around the parent star in less than 23 hours, which classifies it as a “hot Jupiter.”

According to scientists, the planet WASP-18b about another one million years before being destroyed by its parent star, writes resource

Observing WASP-18 using X-ray Observatory Chandra NASA, Pillitteri team discovered that the star is relatively quiet, which is typical for older stars. Young stars, in contrast, are characterized by high activity, strong magnetic fields, powerful flares and more intense X-ray radiation. Star activity is related to its rotation around its axis. With age, this process slows down.

Researchers estimate that the age of WASP-18 ranges from 500 million to 2 billion years. Thus, the activity of the star is 100 times lower than that of its peers. At the same time, scientists blame a nearby planet that gives the magnetic field of the star. This effect is analogous to the tides on Earth caused by the gravitational pull of the moon, but on a much larger scale.

The findings are published in the journal Astronomy and Astrophysics.

Previously, other astronomers have made at least an interesting discovery. They found traces of the oldest stars in the universe .


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