livus, 11 months ago

From the article:

A weird, super-hot celestial body is breaking records and challenging astronomers' understanding of the boundary between stars and planets. 

The object, called WD0032-317B, is a brown dwarf — a type of bright, gaseous "protostar". Brown dwarves typically have a similar atmospheric composition to Jupiter but are 13 to 80 times larger. At that mass, these objects begin to fuse hydrogen isotopes in their cores. However, they aren't quite massive enough to spark the kind of full self-sustaining stellar fusion that powers stars like our sun — think of smoldering charcoal rather than a lit wood-fired oven. 

Brown dwarfs usually burn at around 4,000 degrees Fahrenheit (2,200 degrees Celsius). That's fairly cool compared with most stars, whose surface temperatures reach about 6,700 F (3,700 C). 

But WD0032-317B, which is 1,400 light-years from Earth, is not like most brown dwarfs. In a paper published to the preprint database arXiv and accepted by the journal Nature Astronomy, researchers measured the object's surface temperature and found it was a blistering 13,900 F (7,700 C). That's hot enough for the molecules in its atmosphere to fall apart into their component atoms. It's also several thousand degrees hotter than the surface of our sun.