Brown dwarfs

Part of the Springer Praxis Books book series (PRAXIS)

6.10 Summary

The main conclusions of this chapter can be summarised as follows:
  • The existence of brown dwarfs has now been amply confirmed through direct observations.

  • Wide-angle near-infrared surveys (DENIS, 2MASS) and deep optical surveys (SDSS) are uncovering numerous examples of L- and T-type brown dwarfs in the general field.

  • Theoretical models are becoming increasingly mature. Dust and cloud formation play important roles in the evolution of the atmospheric properties of these cool dwarfs.

  • Brown dwarfs are relatively rare as companions to main sequence (or post main sequence) stars; approximately 15% of ultracool dwarfs are near equal-mass binaries with separations of 5–15 AU.

  • In the next few years, mid-infrared satellites, such as Spitzer, are likely to find brown dwarfs with temperatures as low as 300 K, almost certainly requiring the addition of a new spectral class, ammonia-rich Y dwarfs.


White Dwarf Spectral Type Main Sequence Spectral Energy Distribution Nearby Star 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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