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.
- Brown dwarfs
- Book Title
- New Light on Dark Stars
- Book Subtitle
- Red Dwarfs, Low-Mass Stars, Brown Dwarfs
- pp 237-288
- Print ISBN
- Online ISBN
- Series Title
- Springer Praxis Books
- Springer Berlin Heidelberg
- Copyright Holder
- Praxis Publishing Ltd, Chichester, UK
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