Searching for Brown Dwarfs in the Spitzer/IRAC Shallow Survey

Details Searching for Brown Dwarfs in the Spitzer/IRAC Shallow Survey Searching for Brown Dwarfs in the Spitzer/IRAC Shallow Survey

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916107m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #161.07; Bulletin of the American Astronomical Society,

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The IRAC Shallow Survey in Bootes, augmented by J and Ks photometry obtained as part of the FLAMINGOS Extragalactic Survey (FLAMEX), provides an ideal dataset for the search of brown dwarfs and other cool objects, as demonstrated by the recent detection of a T4.5 spectral type brown dwarf by Stern et al. (astro-ph/0608603). More brown dwarfs of L and early T type are expected to be found in the Bootes survey area, but an efficient and thorough method is required to complete the search. We present here a statistical technique for the automatic photometric classification of astronomical sources, that aims to satisfy these requirements. Based on the k-Nearest Neighbor method, this technique provides an unbiased tool for selecting brown dwarf candidates by comparing their colors with a set of templates derived from IRAC Guaranteed Time Observations (Patten et al. 2006, astro-ph/0606432), and it has already proved its effectiveness by identifying brown dwarf companions around nearby stars (Luhman et al. 2006, astro-ph/0609464). We describe its application to the search for field brown dwarfs in the Shallow Survey/FLAMEX database.
This work is based in part on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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