---
author:
- 'P. Delorme'
- 'L. Albert'
- 'T. Forveille'
- 'E. Artigau'
- 'X. Delfosse'
- 'C. Reylé'
- 'C. J. Willott'
- 'E. Bertin'
- 'S. M. Wilkins'
- 'F. Allard'
- 'D. Arzoumanian'
bibliography:
- 'bib.bib'
title: |
    Extending the Canada-France brown Dwarfs Survey to the near-infrared:\
    first ultracool brown dwarfs from CFBDSIR [^1]
---

Introduction
============

The significant improvement in detector technology, data storage, and analysis facilities in the past decade has made it possible to carry out wide-field surveys covering a large fraction of the sky instead of targeting specific sources. The wealth of data from these surveys necessitate a complex dedicated computer analysis to single out relevant scientific information. These surveys, such as DENIS [@Epchtein.1997], SDSS [@York.2000], 2MASS [@Skrutskie.2006], UKIDSS [@Lawrence.2007], and CFBDS [@Delorme.2008b] contain hundreds of millions of astrophysical sources and led to many advances in various fields, notably to identify extremely rare objects and build robust statistical studies.

The survey we are presenting here, the Canada-France Brown Dwarfs Survey-InfraRed aims at finding ultracool brown dwarfs (T$_{eff}<$ 650K) of which only 6 are currently published by @Warren.2007 [@Delorme.2008a; @Burningham.2008; @Burningham.2009; @Burningham.2010sub]. @Lucas.2010sub have very recently identified a probably even cooler object. These 