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New near-infrared large-area sky surveys (e.g. UKIDSS, CFBDS, WISE) go deeperthan 2MASS and aim at detecting brown dwarfs lurking in the Solar neighbourhoodwhich are even fainter than the latest known T-type objects, so-called Ydwarfs. Using UKIDSS data, we have found a faint brown dwarf candidate withvery red optical-to-near-infrared but extremely blue near-infrared colours nextto the recently discovered nearby L dwarf SDSS J141624.08$ + $134826.7. Wecheck if the two objects are co-moving by studying their parallactic and propermotion and compare the new object with known T dwarfs. The astrometricmeasurements are consistent with a physical pair ($sep$$\approx$75 AU) at adistance $d$$\approx$8 pc. The extreme colour ($J$$-$$K$$\approx$$-$1.7) andabsolute magnitude ($M_J$=17.78$\pm$0.46 and $M_K$=19.45$\pm$0.52) make the newobject appear as one of the coolest (T$_{eff}$$\approx$600 K) and nearest browndwarfs, probably of late-T spectral type and possibly with a high surfacegravity (log $g$$\approx$5.0).

astronomy and astrophysics

ULAS J141623.94$ + $134836.3 - a faint common proper motion companion of  a nearby L dwarf. Serendipitous discovery of a cool brown dwarf in UKIDSS DR6