Astronomers have recently discovered a new exoplanet, which belongs to a new category, super hot Neptune. The planet, known as LT 9779b, has an orbit very close to its star. Astronomers have also raised the question of how such a system came into being. The planet was discovered by an international team, including astronomers at Cambridge University, using the extrasolar planetary survey satellite (TESS). < p > < p > LTT 9779b is about 260 light-years away from the earth, and it is so close to the star that its revolution cycle is less than one earth day – it goes around the star once every 19 hours – intense radiation will make the planet’s temperature exceed 1700 ℃, thus gaining the title of “ultra-high temperature”. < / P > < p > LTT 9779b is larger than Neptune, but much more massive. The team calculated that its core mass is about 28 Earth masses, and its atmosphere accounts for about 9% of its mass. And that’s the beginning of the puzzle. Because the system is about two billion years old, the planet should not be able to keep its atmosphere that long. Strong radiation so close to the star should have eroded the atmosphere long ago. That’s why there are so few Neptune sized planets found so close to their stars. < / P > < p > the researchers say the most likely explanation for how the LT 9779b formed today is that it was once a gas giant, but the gravity of the star engulfs most of its outer layers. But there are other options. < / P > < p > “it’s also possible that the LT 9779b arrived in its current orbit very late, so it hasn’t been stripped of the atmosphere yet,” said James Jenkins, lead researcher on the study. “Collisions with other planets in the system could throw it into the star. In fact, because it is such a unique and rare world, the more exotic situation may be credible. ” Didi Qingju bicycle has entered 150 cities

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