NOAO > Observing Info > Approved Programs > 2002A-0307
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NOAO > Observing Info > Approved Programs > 2002A-0307 |
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PI: Bertrand Goldman, NMSU, bgoldman@nmsu.edu
Address: MSC 4500, Las Cruces, NM 88003
CoI: Mark Marley, NASA/Ames
CoI: Chris Gelino, NMSU
CoI: Rafael Rebolo, IAC
CoI: Xavier Delfosse, UJF, France
CoI: Sandy Leggett, JACH
CoI: Eduardo Martin, IfA
Title: Infrared photometry of atmospheric variability in L dwarfs
Abstract:
We propose to observe L dwarfs to study their photometric
variability using SQIID. This proposal is part of a multi-site and
multi-wavelength observing effort to study their largely unknown
atmospheric activity. L and early T-dwarf spectra are strongly
influenced by the presence of silicate and iron clouds. Heterogeneity
in the cloud cover, as well as the less likely star spots, accretion and
eclipsing binary, would produce photometric variability. IR photometry
complemented by optical photometry will help distinguishing between the
variability causes and will provide information about temperature
variations linked to holes in the could cover. We will monitor the
photometric variations continuously over several periods in order to
constrain the dynamics of the phenomenon causing the variability.
Assuming the cloud cover model is correct, these data will greatly
improve our knowledge of the behavior, size and location of condensates
in atmospheres.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360
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NOAO > Observing Info > Approved Programs > 2002A-0307 |
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