Other
Scientific paper
Oct 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop..281l&link_type=abstract
Spitzer Proposal ID #281
Other
Scientific paper
The first data releases (EDR and DR1) from the UKIRT Infrared Deep Sky Survey are now available. UKIDSS goes three magnitudes fainter than 2MASS, and should discover even cooler low-mass brown dwarfs than those currently known. Searches of the EDR and of the 0-2 hour RA range in DR1 have produced three spectroscopically confirmed T4-T6 dwarfs and one other dwarf that looks to be the seventh known later than T7, or cooler than 900K. This object, ULAS0034-00, appears to be very similar in the near-IR to a known T8 with Teff=700K. It may in fact be cooler, as the spectral absorption features in the near-IR are extremely strong at these temperatures, and little flux remains either to be absorbed or for use for spectral typing. Although bands of NH3 are expected to be seen at 600K, there is evidence that the abundance of NH3 is much lower than calculated, and so these features may not be seen until much cooler temperatures are reached. IRAC photometry will allow us to determine whether this object is significantly cooler than the known late T dwarfs, and is perhaps the prototype of the Y dwarfs. DDT time is requested so that these data can be obtained seven months earlier than would otherwise be possible in Cycle 4. The results will be important both for searches of the ongoing UKIRT survey, and for modelling the coolest dwarfs. It is possible that all 500-700K brown dwarfs will look the same in the near-IR, and can only be distinguished by Spitzer mid-IR observations.
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