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L-Band Photometry of L and T Dwarfs
D. C. Stephens, M. S. Marley, K. S. Noll +1
We present K- and L-band photometry obtained with the Keck I telescope for a representative sample of L and T dwarfs. These observations were motivated in part by the dominant role…
L-dwarf variability: Magnetic star spots or non-uniform clouds?
Christopher R. Gelino, Mark S. Marley, Jon A. Holtzman +2
The recent discovery of photometric variations in L dwarfs has opened a discussion on the cause of the variations. We argue against the existence of magnetic spots in these atmosph…
Clouds and Chemistry: Ultracool Dwarf Atmospheric Properties from Optical and Infrared Colors
M. S. Marley, S. Seager, D. Saumon +4
The optical and infrared colors of L and T dwarfs are sensitive to cloud sedimentation and chemical equilibrium processes in their atmospheres. The i'-z' vs. J-K color-color diagra…
Precipitating Condensation Clouds in Substellar Atmospheres
Andrew S. Ackerman, Mark S. Marley
We present a method to calculate vertical profiles of particle size distributions in condensation clouds of giant planets and brown dwarfs. The method assumes a balance between tur…
The Role of Clouds in Brown Dwarf and Extrasolar Giant Planet Atmospheres
M. S. Marley, A. S. Ackerman
Clouds and hazes are important throughout our solar system and in the atmospheres of brown dwarfs and extrasolar giant planets. Among the brown dwarfs, clouds control the colors an…
Infrared Observations and Modeling of one of the Coolest T Dwarfs, Gl 570D
T. R. Geballe, D. Saumon, S. K. Leggett +3
We have obtained a good quality R400 0.8-2.5 m spectrum and accurate photometry of Gl 570D, one of the coolest and least luminous brown dwarfs currently known. The spectru…