Newly discovered planet is hotter than most stars

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PASADENA, Calif. — A newly discovered planet is so hot, it’s being vaporized by its own star, NASA said Tuesday.

KELT-9B has a day-side temperature of more than 7,800 degrees and NASA said it’s hotter than most stars.

The Jupiter-like planet is described in this week’s issue of the journal Nature and at a presentation at the American Astronomical Society spring meeting.

An international research team said the planet’s blue A-type star, called KELT-9, which is nearly twice as hot as the sun, is possibly unraveling the planet through evaporation because it radiates so much ultraviolet radiation.

The researchers said KELT-9B is tidally locked to its star — as the moon is to Earth — so one side of the planet is always facing toward the star, and one side is in perpetual darkness.

Illustration of KELT-9, left, and KELT-9B. Courtesy: NASA/JPL-Caltech

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