Artist's concept:
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With a dayside temperature of more than 7,800 degrees Fahrenheit (4,600 Kelvin), KELT-9b...
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Molecules such as water, carbon dioxide and methane can’t form on the dayside because it is bombarded by too much ultraviolet radiation...
the planet may even be shedding a tail of evaporated planetary material like a comet.
“KELT-9 radiates so much ultraviolet radiation that it may completely evaporate the planet...
the planet completes a “yearly” circuit around its star every 1.5 days.