Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.6904b&link_type=abstract
American Astronomical Society Meeting 210, #69.04; Bulletin of the American Astronomical Society, Vol. 39, p.176
Astronomy and Astrophysics
Astronomy
Scientific paper
T dwarfs are the coldest and least luminous spectral class of brown dwarfs currently known, exhibiting spectral energy distributions not unlike those of hot exoplanets. Late-type T dwarfs are also ideal sources for examining surface gravity and metallicity effects on brown dwarf spectra, as they lack the complicating influence of optically thick photospheric condensate clouds common to the L dwarfs. In this talk I will describe recent efforts to disentangle the contributions of effective temperature, surface gravity and metallicity on the spectra of T dwarfs using advanced spectral models and empirical calibration. I will also discuss implications of this work, including constraints on the physical properties of individual sources (such as the H-alpha emitting field brown dwarf 2MASS 1237+6526 and the brown dwarf companion HD 3651B), and direct measurements of the substellar mass function in the vicinity of the Sun.
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