‘Cool’ brown dwarf star discovered.
by New Scientist:
Y dwarfs are the coldest class of brown dwarfs, star-like bodies that are too low-mass to fuse hydrogen in their cores. These “failed stars” don’t burn the way stars like our sun do, meaning they do not emit visible wavelengths that most telescopes can spot.
Six of those were Y dwarfs, hitherto-theoretical bodies cooler than 226 °Celsius. One of them, WISE 1828+2650, is cooler than 25 °C, making it the coolest brown dwarf ever discovered. Another candidate brown dwarf, reported in March, appears to be 30 °C, but before that the coolest one was about 100 °C.
“The brown dwarfs we were turning up before this discovery were more like the temperature of your oven,” Davy Kirkpatrick of the California Institute of Technology in Pasadena, says in a press release. “With the discovery of Y dwarfs, we’ve moved out of the kitchen and into the cooler parts of the house.”
The Y dwarfs are between 9 and 40 light years from the sun. Our celestial neighbourhood may be full of these ultra-cool stars that we haven’t spotted yet, says Michael Cushing of NASA’s Jet Propulsion Laboratory in Pasadena.
“Finding brown dwarfs near our sun is like discovering there’s a hidden house on your block that you didn’t know about,” he says. “It’s thrilling to me to know we’ve got neighbours out there yet to be discovered.”
The mass of a star like this would be about 8% of the sun’s mass, fairly small.
The current discovery illustrates the current advancements being made in the space exploration field.