NOAO >   Observing Info >   Approved Programs >   2003B-0091

Small NOAO Logo

Proposal Information for 2003B-0091


PI: Sandy Leggett, Joint Astronomy Centre, skl@jach.hawaii.edu
Address: 660 North Aohoku Place, University Park, HI, 96720, USA

CoI: Denise Stephens, Space Telescope Science Institute
CoI: Keith Noll, Space Telescope Science Institute
CoI: Tom Geballe, Gemini Observatory - North

Title: 10 Micron imaging of T Dwarfs

Abstract: We propose to use Michelle to obtain broadband N photometry of four T dwarfs and one L dwarf. We will also image the two coolest objects in the sample, with effective temperatures 700-900 K, through the 10.4 and 11.7 micron filters. The broadband observations are important for determining the bolometric luminosity and the long wavelength end of the spectral energy distribution of these extremely cool objects, and the results will complement data from SIRTF's IRAC camera. The narrowband observations will be used to search for the ammonia feature at ~10.6 microns. This feature is expected to be strong but recent models suggest that non-equilibrium chemistry will weaken the band. The narrowband data can be used to confirm and flux-calibrate any future SIRTF spectra. Mid-IR data is currently lacking for cool dwarfs and such data are fundamental to the study of brown dwarf and extrasolar planet 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 >   2003B-0091

noaoprop-help@noao.edu

Small NOAO Logo