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Planet with three suns

19.07.2016

A team of astronomers led by Daniel Apai from the University of Arizona (USA) discovered a planet that occupies a rare position between three stars at once. In a distant world, you can enjoy three sunrises and sunsets at once a day. The discovery was made using a highly sensitive infrared spectrometer, which is part of the Very Large Telescope (European Southern Observatory, Chile).

The planet HD 131399Ab rotates in an extended orbit in the constellation Centaurus. Scientists estimate that it is about 16 million years old, making it one of the youngest exoplanets. The planet is about four times the size of Jupiter. It is approximately 340 light years from Earth.

In addition, HD 131399Ab is one of the coldest exoplanets discovered to date, with its surface heating up to 580 ?C.

According to Kevin Wagner, one of the members of the research team, the planet HD 131399Ab completes half of its orbit in 550 Earth years. All this time, three stars are visible in her sky. For most of the year, two of them converge, providing a night shadow on one side of the planet. However, as the planet moves along its orbit, they diverge so that the sunset of one coincides with the sunrise of the other. HD 131399Ab is in this "permanent day" position for about a quarter of its orbital journey - about 140 Earth years.

At the center of this complex star system is the star HD 131399A, around which the twin stars B and C also rotate. The planet HD 131399A rotates in an orbit twice that of Pluto, the planet most distant from the Sun.

To date, this complex system appears to be fairly stable, the researchers say. However, the slightest change can destabilize it. As shown by a computer study, in this case, the planet can be thrown out of the star system.

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