NOAO >   Observing Info >   Approved Programs >   2002A-0307

Small NOAO Logo

Proposal Information for 2002A-0307


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



NOAO >   Observing Info >   Approved Programs >   2002A-0307

noaoprop-help@noao.edu

Small NOAO Logo