Effective temperatures of the Three Coolest Brown Dwarfs.

Details Effective temperatures of the Three Coolest Brown Dwarfs. Effective temperatures of the Three Coolest Brown Dwarfs.

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50667a&link_type=abstract

Spitzer Proposal ID #50667

Physics

Scientific paper

We propose to observe three ultra cool brown dwarfs with the IRS and IRAC that were found in the Canada-France Brown Dwarfs Survey. They were drawn from analysis of 550 square degrees of our ongoing survey from an initial pool of 920 i'-z' <= 1.7 red objects. The three brown dwarfs we propose to observe have a color z'-J as red or redder than the coolest known dwarf, ULAS0034, and a similar or brighter J-band magnitude. One of our candidates, CFBDS1, is already confirmed to be of spectral type T8.5+, and is slightly cooler than ULAS0034 (paper to be submitted). IRAC photometry combined to already available izYJHK data is an invaluable tool to reconstuct the SED and accurately determine the effective temperatures of these dwarfs. The IRS spectrum between 7 and 14 microns in turn will probe a temperature regime yet unexplored and constraint the currently uncertain atmosphere models. IRAC and IRS measurements of ULAS0034 and the 3 BDs we propose to observe here will provide unique templates to understand the many cooler dwarfs which will be discovered after the Spitzer coolant is depleted.

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