On 5 june 2017 Astronomers have discovered the hottest planet ever known, with a dayside temperature of more than 4,300 degrees Celsius. In fact, this planet, called KELT-9b, is hotter than most stars, according to a study published in the journal Nature.
This is the hottest gas giant planet that has ever been discovered,” said Scott Gaudi, Professor at the Ohio State University in Columbus who led a study.KELT-9b is 2.8 times more massive than Jupiter, but only half as dense.As has been highlighted by the recent discoveries from the MEarth collaboration, the planet around Proxima Centauri, and the astonishing system discovered around TRAPPIST-1, the astronomical community is clearly focused on finding Earthlike planets around small, cooler stars like sun, They are easy targets and there’s a lot that can be learned about potentially habitable planets orbiting very low-mass stars in general.Kelt-9b planet was discovered in 2014 when astronomers spotted the shadow as it crossed the face of its host star 650 light years away from Earth in the constellation of Cygnus. The planet was so close to the star that its surface reaches more than 4300 degrees C, making it the hottest giant planet ever found.Astronomers discovered this hottest planet using two robotic telescopes Kilodegree Extremely Little Telescope (KELT) in Arizona and Sutherland to the north of Cape Town in South Africa. The twin telescopes focused on a star called Kelt-9 which at 10000 degrees C is nearly twice as hot as the sun. The observations revealed a regular dimming of starlight reaching Earth, the signature of a massive planet that was moving around it once every one-and-a-half days.