Feeds

Room-temperature brown dwarf spied just 9 light-years off

'Like finding a secret house on your block'

5 things you didn’t know about cloud backup

Scientists perusing data collected by NASA's Wide-field Infrared Survey Explorer (WISE) have spotted some really cool stars – brown dwarfs with an atmospheric temperature as low as an agreeable 25°C.

Dubbed "Y dwarfs", these objects have hitherto eluded astronomers hunting them at visible wavelengths, although WISE has finally nailed six examples within a distance of around 40 light-years from our own Sun.

Artist's impression of a Y dwarf. Pic: NASA

Jon Morse, Astrophysics Division director at NASA's Washington headquarters, explained: "They are 5,000 times brighter at the longer infrared wavelengths WISE observed from space than those observable from the ground."

Brown dwarfs are stars whose lack of mass prevented a sustained nuclear reaction at their cores, condemning them to fade and cool instead of shining proudly in the heavens.

The WISE celestial survey has so far yielded 100 of these stellar failures, including the half dozen Y dwarfs. The coolest of the latest letter in the stellar classification scheme* is the snappily-named WISE 1828+2650 (see below), which has "an estimated atmospheric temperature cooler than room temperature".

WISE image of Y dwarf WISE 1828+2650. Pic: NASA

WISE science team member Davy Kirkpatrick said: "The brown dwarfs we were turning up before this discovery were more like the temperature of your oven. With the discovery of Y dwarfs, we've moved out of the kitchen and into the cooler parts of the house."

The NASA boffins are also excited about the Y dwarfs because of their relative proximity to Earth. One of them, WISE 1541-2250, is roughly nine light-years from our beloved homeworld, and "may become the seventh closest star system, bumping Ross 154 back to eighth". NASA adds: "By comparison, the star closest to our solar system, Proxima Centauri, is about four light-years away."

Michael Cushing, another WISE team member, enthused: "Finding brown dwarfs near our sun is like discovering there's a hidden house on your block that you didn't know about.It's thrilling to me to know we've got neighbors out there yet to be discovered. With WISE, we may even find a brown dwarf closer to us than our closest known star."

NASA has more of the Y dwarf discovery here. ®

Bootnote

*NASA elaborates: "This scheme describes stars of all temperatures, beginning with the hottest "O" stars and now ending with the coldest Y dwarfs. The entire scheme includes the classes: O, B, A, F, G, K, M, L, T, Y. Our yellow sun belongs to the G class of stars. M stars are colder than our sun, and reddish in color."

It adds: "While the O through K classes are all considered stars, M and L objects are a mixture of stars and brown dwarfs, and T and Y objects are all brown dwarfs. The term 'brown dwarfs' was chosen because at that time, astronomers didn't know what colors these objects would actually have at the visible wavelengths our eyes see, and brown is not a true color of light (there are no 'brown photons'). Astronomers now know that T dwarfs would appear reddish, or magenta, to the eye. But they are not certain what color Y dwarfs are, since these objects have not been detected at visible wavelengths."

NASA comparative image of the colour of L, T and Y dwarfs

Accordingly, NASA explains the purple hue shown in its artist's impression of a Y dwarf was chosen "mainly for artistic reasons".

Build a business case: developing custom apps

More from The Register

next story
Boffins ID freakish spine-smothered prehistoric critter: The CLAW gave it away
Bizarre-looking creature actually related to velvet worms
ANU boffins demo 'tractor beam' in water
The current state of the art, apparently
China to test recoverable moon orbiter
I'll have some rocks and a moon cheese pizza please, home delivery
NASA's rock'n'roll shock: ROLLING STONE FOUND ON MARS
No sign of Ziggy Stardust and his band
What does a flashmob of 1,024 robots look like? Just like this
Sorry, Harvard, did you say kilobots or KILLER BOTS?
Why your mum was WRONG about whiffy tattooed people
They're a future source of RENEWABLE ENERGY
Vulture 2 spaceplane autopilot brain surgery a total success
LOHAN slips into some sexy bespoke mission parameters
Another step forward for diamond-based quantum computers
Square cut or pear-shaped, these qubits don't lose their shape
LOHAN acquires aircraft arboreal avoidance algorithm acronyms
Is that an ARMADILLO in your PANTS or are you just pleased to see me?
prev story

Whitepapers

Endpoint data privacy in the cloud is easier than you think
Innovations in encryption and storage resolve issues of data privacy and key requirements for companies to look for in a solution.
Implementing global e-invoicing with guaranteed legal certainty
Explaining the role local tax compliance plays in successful supply chain management and e-business and how leading global brands are addressing this.
Top 8 considerations to enable and simplify mobility
In this whitepaper learn how to successfully add mobile capabilities simply and cost effectively.
Solving today's distributed Big Data backup challenges
Enable IT efficiency and allow a firm to access and reuse corporate information for competitive advantage, ultimately changing business outcomes.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.