Physics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.6901l&link_type=abstract
American Astronomical Society Meeting 210, #69.01; Bulletin of the American Astronomical Society, Vol. 39, p.176
Physics
Scientific paper
The prototype T dwarf was found as a companion to an M dwarf in 1995. The next, cooler, spectral type, Y, as we'll hear in this session, may also be found as a companion, or in ongoing and planned deep sky surveys. There are now over 100 known T dwarfs, found primarily as a result of sky surveys. We'll see that the sample is large enough, and models advanced enough, to study a range of atmospheric properties and phenomena such as metallicity, gravity and clouds. In this talk I will describe the currently known population of very-late T dwarfs, including recent results from the UK Infrared Deep Sky Survey. I will show how incomplete near-infrared ammonia and methane opacities lead to discrepancies between modelled and observed spectral energy distributions (SEDs) of the late-T dwarfs, and also lead to large uncertainties in the calculated SEDs of Y dwarfs. Its important both to improve the molecular linelists, and to discover the extreme-T or Y dwarfs, which will have effective temperatures of 500-600K. Such objects will extend the field brown dwarf population to very low masses of 10-40 Jupiter-masses, and into a region where there will be much overlap with planetary physics.
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