Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..319d&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
We present the latest results from the
Canada-France Brown Dwarf Survey (hereafter CFBDS), which identified
about 70 T dwarfs and more than 300 L dwarfs. It particularly
discovered CFBDS J005910.90011401.3 (Delorme et al. 2008a, hereafter
CFBDS0059), the coolest brown dwarf known (Albert
et al., in prep.). This lead to the discovery of a probable ammonia
absorption band in
the near infrared spectra of CFBDS0059 and ULAS J003402.77005206.7
(Warren et al. 2007, hereafter ULAS0034). These objects, along with
the recently identified ULAS1335 (Burningham et al. 2008) are
the coolest known brown dwarfs and their spectra probe a hitherto
unobserved effective temperature range.
The spectra of both CFBDS0059 and ULAS~J0034 show absorption by a
wide band on the blue side of the H~band flux peak, which we
attribute to ammonia. If, as we expect, that feature deepens
further for still lower effective temperatures, its appearance would become a natural breakpoint for the
transition between the T spectral class and the new Y spectral
type.
Albert Loic
Artigau Étienne
Delfosse Xavier
Delorme Patrick
Forveille Thierry
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