Researchers from the University of Geneva (UNIGE) and the University of Berne (UNIBE) have discovered the hottest planet. According to spectral data, iron and titanium vapors appear in the atmosphere of this planet. It is believed that its surface temperature has reached 4600K! Related papers were published in the August issue of Nature (Nature 2018).
What planet is the hottest planet?
This hottest planet, whose parent star KELT-9 is located in the constellation Cygnus, is 650 light-years away from Earth. Its temperature is as high as 10,170K, almost twice that of the sun. Since transiting stars are rarely observed next to hot stars, only 6 A-type main-sequence stars have been seen before there are planets, and the hottest parent star WASP-33 is 7430 K, so when KELT-9b is Discovered and attracted the attention of astronomers.
This huge gas planet KELT-9b is only 1/30 of the distance from the earth to the sun from its parent star, and its orbit period is 36 hours, so the surface is heated to 4,600K, even hotter than many stars. Astronomers used the HARPS-North spectrometer of the 3.58-meter telescope (Telescopio Nazionale Galileo) on La Palma in the Canary Islands and found that when the planet KELT-9b passes in front of the host star, strong iron Steam, I saw the signal of titanium when I further studied the data, so I think its surface temperature has reached 4000 degrees! Theoretical researchers at the University of Bern believe that the atmosphere of this planet should be in an atomic state, because particle collisions at extremely high temperatures will destroy the bonds between molecules. However, astronomers do not yet know the exact appearance of the atmosphere, and want to understand the development process of this planetary atmosphere.