Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21730104k&link_type=abstract
American Astronomical Society, AAS Meeting #217, #301.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The coolest brown dwarfs currently known are field T9 and T10 dwarfs with Teff 450-600K and implied masses of around 5-35 MJup for assumed ages of 1-10 Gyr. Colder field brown dwarfs must exist because studies of young star formation regions have revealed objects even lower in mass, which, at the age of the field population, will have cooled to temperatures well below 450K. Finding and characterizing such cold objects will set important boundary conditions on the shape of the initial mass function at the lowest masses, will help determine the low-mass cutoff for star formation, and will provide low-temperature fiducials important to the study of exoplanet atmospheres. Also of interest is determining the spectroscopic morphology of these colder objects; will a new spectral class beyond T, dubbed "Y", be needed? In this talk, I will highlight preliminary brown dwarf discoveries from the Wide-field Infrared Survey Explorer (WISE).
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