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We present the first results of the ongoing Canada-France Brown DwarfsSurvey-InfraRed, hereafter CFBDSIR, a Near InfraRed extension to the opticalwide-field survey CFBDS. Our final objectives are to constrain ultracoolatmosphere physics by finding a statistically significant sample of objectscooler than 650K and to explore the ultracool brown dwarf mass functionbuilding on a well defined sample of such objects. Candidates are identified inCFHT/WIRCam J and CFHT/MegaCam z' images using optimised psf-fitting, and wefollow them up with pointed near infrared imaging with SOFI at NTT. We finallyobtain low resolution spectroscopy of the coolest candidates to characterisetheir atmospheric physics. We have so far analysed and followed up allcandidates on the first 66 square degrees of the 335 square degrees survey. Weidentified 55 T-dwarfs candidates with z'-J > 3:5 and have confirmed six ofthem as T-dwarfs, including 3 that are strong later-than-T8 candidates, basedon their far-red and NIR colours. We also present here the NIR spectra of oneof these ultracool dwarfs, CFBDSIR1458+1013 which confirms it as one of thecoolest brown dwarf known, possibly in the 550-600K temperature range. From thecompleted survey we expect to discover 10 to 15 dwarfs later than T8, more thandoubling the known number of such objects. This will enable detailed studies oftheir extreme atmospheric properties and provide a stronger statistical basefor studies of their luminosity function.

Extending the Canada-France brown Dwarfs Survey to the near-infrared: first ultracool brown dwarfs from CFBDSIR