Computer Science
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop...77l&link_type=abstract
NOAO Proposal ID #2007B-0077
Computer Science
Scientific paper
The transition between the L and T dwarfs is one of the outstanding issues in the study of brown dwarfs due to the inability of all model atmospheres to reproduce the observations of late-type L dwarfs and early- to mid-type T dwarfs. We request 7.2 hours of GNIRS time to obtain a 3.3-4.1 um spectrum of the T2.5 dwarf HN PegB. Together with an existing far-red through near-infrared spectrum, and requested Spitzer Guaranteed Time IRS 5-14.5 um spectra, these data will provide a very nearly complete spectral energy distribution for HN PegB (in particular including the bright 4um flux peak) thus facilitating a detailed analysis of an L/T transition dwarf. This is the only early-T dwarf companion to a main sequence star of known age, metallicity, and distance for which such a complete spectral energy distribution can be obtained. In particular, we will (1) determine a more precise value of Teff, the current estimate of which appears discrepant for HD PegB's spectral type, and (2) constrain the loss of the condensate (i.e. dust) clouds from the photosphere, a process which is thought to control the transition between the L and T dwarfs.
Crane Megan
Cushing Mike
Kirkpatrick Davy
Leggett Sandy
Mainzer Amy
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