WE THINK of stars, even the failed ones called brown dwarfs, as being lethally hot. That picture has been confounded by a newly discovered brown dwarf 鈥� at room temperature.
Like fully fledged stars, brown dwarfs form from collapsing gas clouds, but they are not massive enough to sustain nuclear reactions. Instead, they briefly shine red from the heat of formation, then fade. Still, the coolest known brown dwarfs are all hot enough to roast any spacefarers who venture too close.
Now Kevin Luhman of Pennsylvania State University in University Park and colleagues have used NASA鈥檚 infrared Spitzer Space Telescope to detect the glow of what appears to be a brown dwarf at just 30 掳C ().
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The object, which orbits a white dwarf star 63 light years from Earth, weighs seven times as much as Jupiter. At that mass, it would normally be considered a planet. But planets form from discs of gas and dust around stars, and the researchers say that the object, known as WD 0806-661 B, lies too far from its star 鈥� at 2500 times the Earth鈥檚 distance from the sun 鈥� to be deemed a planet if it formed where it is.
The object is a lot hotter than Jupiter, which is at a frigid -149 掳C, and much cooler than the , at 100 掳C. This means that WD 0806-661 B will act as a 鈥渕issing link鈥� to reveal how temperature affects the atmosphere and spectral features of objects that are roughly the size of Jupiter.
