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Hottest hot Jupiter yet.

The bloated exoplanet KELT-9b is now the hottest gas giant known. With almost triple Jupiter's mass but half its density, the exoplanet orbits an A-type star more than twice as massive as our Sun every 18 hours. The constant bombardment of ultraviolet energy toasts KELT-9b like a marshmallow, bringing its daytime temperature to around 4600K (7800[degrees]F), hotter than most red dwarf stars and only about 1200K cooler than our Sun's visible surface. The exoplanet is some 1000K hotter than any other known transiting gas giant, Scott Gaudi (Ohio State University) and colleagues report June 5th in Nature and at the summer American Astronomical Society meeting in Austin, Texas.

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Title Annotation:KELT-9b
Author:Dickinson, David
Publication:Sky & Telescope
Article Type:Brief article
Date:Aug 24, 2017
Words:110
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