We’ve just found the hottest planet ever
Astronomers with the extremely small Kilodegree survey telescope (s) (KELT) just announced an incredible discovery: the hottest gas giant ever discovered. In fact, the planet is so hot that it is hotter than most stars, and there are only a few thousand degrees colder than our sun.
The planet, KELT-9b, is about three times the mass of Jupiter and twice its size. His discovery was announced by B. Scott Gaudi of Ohio State University and Vanderbilt University Karen Collins at a press conference Monday afternoon at the 230th session of the American Astronomical Society in Austin, Texas. “We are delighted to announce today the discovery of KELT-9b … a giant gas planet warmer than most stars. And we want to emphasize that this is not a mistake,” Collins said at the conference. press. He then explained that KELT-9b is very hot by the sun “the host star, the hottest giants gas giants and the most massive known giants brighter.” Along with the announcement, the work was also published online in the form of a letter in the journal Nature.
The host star is about 2.5 times the mass of our Sun, and rotates so fast (about once a day) that it is a flattened egg shape that a sphere, like the planet Saturn. Whenever KELT-9b passes in front of its sun, the star’s light decreases only half a percent. The star, a warm blue star, not only radiates in optics, but also raises huge amounts of ultraviolet (UV) light. Its mass production, associated with the vicinity of KELT-9b, increases the temperature of this planet to about 7800 degrees Fahrenheit (4300 Celsius). Because the planet is firmly locked on the same side always faces its star; Astronomers now believe that the next night was much cooler because of the low capacity of the atmosphere to transfer heat from the day side to the grid of the rest of the planet. But even so, this “cool” hot side “The next night would probably be a red dwarf to us,” Gaudi said at the press conference.
In addition, KELT-9b rotates around its star perpendicular to the axis of rotation of the host. This means that they circulate in the same plane as the star’s equator, while the planets around the Sun, KELT-9b flies at the north and south poles of their star with each 1.5-day orbit being completed. This strange orbit, Gaudi said, is probably ready as well, which means that the planet can let its sun travel as seen from Earth in about 150 years, depending on the speed of this precession. Astronomers will have to wait several thousand years before the transits are observed again.
But one of the strangest things KELT-9b may be that it evaporates. Its star emits many UV (700 times the UV radiation transmitted another known gas giant) that “the planet is almost certainly evaporated by high energy photons,” Gaudi said. Although there is no firm measure of how fast gasoline is spent, Gaudi added that KELT-9b could lose its atmosphere at a speed of between 10 billion and 10 billion grams per second. As a result, the planet will probably risk a tail like a comet as it glides around its sun.
On which planet has completely evaporated before its host star only grows in its red giant phase is still in the air. Anyway, Keivan Stassun, part of the discovery and professor of physics and astronomy at Vanderbilt University team, said in a press release accompanying “The prospects of term life or property to KELT-9b are not looks like. ”
Maybe not, but the system is still intriguing and, now, unique. “This will be an excellent system to study with HST, Spitzer and possibly the James Webb space telescope, not to mention ground installations,” Gaudi said. “We are eager to try to characterize the properties of this planet and understanding.”