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Caption: Brown dwarfs in the young star cluster NGC 1333. This photograph combines optical and infrared images taken with the Subaru Telescope. Brown dwarfs newly identified by the SONYC Survey are circled in yellow, while previously known brown dwarfs are circled in white. The arrow points to the least massive brown dwarf known in NGC 1333: it is only about six times heftier than Jupiter.
Credit: SONYC Team/Subaru Telescope

Click the image for a hi-res version.

Caption: Spectra of several brown dwarfs in the young star cluster NGC1333, taken with FMOS instrument on the Subaru Telescope. The spectra show a characteristic peak around 1670nm. Water steam in a brown dwarf's atmosphere absorbs radiation on both sides of the peak. The plot shows that the strength of the water absorption increases in cooler objects (from 3000 to 2200K). FMOS allows astronomers to take spectra for many objects simultaneously, a crucial advantage for the SONYC Survey.
Credit: SONYC Team/Subaru Telescope

Research papers describing the findings of the SONYC survey:

• Substellar Objects in Nearby Young Clusters (SONYC) IV: A Census of Very Low Mass Objects in NGC1333
• Substellar Objects in Nearby Young Clusters (SONYC) V: New Brown Dwarfs in rho Ophiuchi