A Brown Dwarf is Getting Hit With So Much Radiation it's Hotter Than the Sun - by BrianKoberlein
Hot Jupiters are large gas planets that orbit their star closely. Unlike our Jupiter, which radiates more heat than it gets from the Sun, hot Jupiters get more heat from their star than from their interior. As a result, they can have a surface temperature of 1,000 K rather than the 160 K that Jupiter has. They are one of the more common types of exoplanets and the easiest type of exoplanet to discover.
Most hot Jupiters orbit red dwarf stars, which means that they receive a lot of infrared light to keep them warm. But this also means they can easily radiate off heat to maintain a steady temperature. One of the common side effects of being a hot Jupiter is that their upper atmosphere layers tend to swell and evaporate, creating either a fluffy low-density world or a dense world stripped of lighter elements, depending on the stage.
There are a few of these worlds that have extremely hot surfaces, to the point that they seem more star-like than planet-like. In 2017 astronomers discovered the hot Jupiter KELT-9b. It orbits a bright blue star so closely that its period is only 1.5 days. This means the planet is tidally locked with its star, with starside temperatures reaching more than 4,600 K.
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