Twin Brown Dwarfs Wrapped in a Blanket
Ssc2009 21a

Credit: NASA/JPL-Caltech/Calar Alto Obsv./Caltech Sub. Obsv.

Observation • November 23rd, 2009 • ssc2009-21a


This image shows two young brown dwarfs, objects that fall somewhere between planets and stars in terms of their temperature and mass. Brown dwarfs are cooler and less massive than stars, never igniting the nuclear fires that power their larger cousins, yet they are more massive (and normally warmer) than planets. When brown dwarfs are born, they heat the nearby gas and dust, which enables powerful infrared telescopes like NASA's Spitzer Space Telescope to detect their presence.

Here we see a long sought-after view of these very young objects, labeled as A and B, which appear as closely-spaced purple-blue and orange-white dots at the very center of this image. The surrounding envelope of cool dust surrounding this nursery can be seen in purple.

These twins, which were found in the region of the Taurus-Auriga star-formation complex, are the youngest of their kind ever detected. They are also helping astronomers solve a long-standing riddle about how brown dwarfs are formed more like stars or more like planets? Based on these findings, the researchers think they have found the answer: Brown dwarfs form like stars.

This image combined data from three different telescopes on the ground and in space. Near-infrared observations collected at the Calar Alto Observatory in Spain cover wavelengths of 1.3 and 2.2 microns (rendered as blue). Spitzer's infrared array camera contributed the 4.5-micron (green) and 8.0-micron (yellow) observations, and its multiband imaging photometer added the 24-micron (red) component. The Caltech Submillimeter Observatory in Hawaii made the far-infrared observations at 350 microns (purple).

These observations were made before Spitzer ran out its coolant in May of 2009, officially beginning its "warm" mission.

About the Object

Proto Brown DwarfSSTB213 J041757
Star > Type > Brown Dwarf
Star > Evolutionary Stage > Protostar
Star > Evolutionary Stage > Young Stellar Object
Star > Grouping > Binary

Color Mapping

Band Wavelength Telescope
Infrared 1.3 µm CAO 3.5m Omega2000
Infrared 2.2 µm CAO 3.5m Omega2000
Infrared 4.5 µm Spitzer IRAC
Infrared 8.0 µm Spitzer IRAC
Infrared 24.0 µm Spitzer MIPS
Infrared 350.0 µm CSO SHARC2


Position (J2000)
RA =4h 17m 57.8s
Dec = 27° 41' 4.7"
Field of View
2.5 x 2.5 arcminutes
North is 7.3° left of vertical