Giant planet with record short year discovered

UNITED STATES (OBSERVATORY NEWS) — Astronomers have discovered hot Jupiter, which revolves around its sun in just 18 hours. This is a record for giant planets. Now scientists are hoping to find out if this celestial body is waiting for death in the arms of a star.

The discovery is described in a scientific article published in the journal Monthly Notices of the Royal Astronomical Society.

The planet is easier to detect, the larger and closer to its luminary. That is why hot Jupiters became the first discovered exoplanets . For a long time they made up most of the famous worlds.

Today, hundreds of such bodies have been discovered (and in total more than four thousand are known for exoplanets ). But the objects that revolve around their sun in less than an earthly day are literally few among them, and this despite the fact that such a planet is ideal for detection. Apparently, this is indeed a very rare occurrence.

“Although theoretically hot jupiters with short orbital periods (less than 24 hours) are much easier to detect due to their large size and frequent transit , they are extremely rare. Of the hundreds of known hot jupiters, only seven have an orbital period of less than one [Earth] day.” – says the first author of a new article, James McCormack ( James McCormac ) from the University of Warwick.

Planet NGTS-10 b is located in a system located at a distance of about a thousand light-years from Earth. It is about twice as heavy as Jupiter and 20% larger in diameter. Due to its circulation period of 18 hours, it became the shortest period of the known hot Jupiters.

The distance between NGTS-10 b and the parent star is only twice the diameter of the latter and one and a half times – the Roche limit , beyond which tidal forces must break the planet.

Probably, this world is always turned to its sun on one side, and it is heated up to a thousand degrees Celsius (which, however, is not a record ).

Astronomers believe that a planet in a similar orbit should gradually approach a star, and sooner or later it will be destroyed. They expect NGTS-10 b to die in about 38 million years.

Interestingly, the star (and, accordingly, the planet) is an approximate age of the Sun, that is, it is about five billion years old. Probably, NGTS-10 b fell into its destructive orbit not so long ago, having received a gravitational impulse from other (not yet discovered) worlds of the system.

There is a more intriguing possibility: it is possible that short-period hot Jupiters can exist on their trajectories much longer than experts believe. In this case, they will have to clarify their models.

Like it or not, observations will show. Already in the next decade, the “year” of NGTS-10 b will have to change by seven seconds, and scientists expect to notice this. They have already planned the necessary observations.


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