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We present Spitzer observations at 3.6 and 4.5 microns and a near-infraredIRTF SpeX spectrum of the irradiated brown dwarf NLTT5306B. We determine thatthe brown dwarf has a spectral type of L5 and is likely inflated, despite thelow effective temperature of the white dwarf primary star. We calculatebrightness temperatures in the Spitzer wavebands for both the model radius, andRoche Lobe radius of the brown dwarf, and conclude that there is very littleday-night side temperature difference. We discuss various mechanisms by whichNLTT5306B may be inflated, and determine that while low mass brown dwarfs (M<35MJup) are easily inflated by irradiation from their host star, very few highermass brown dwarfs are inflated. The higher mass brown dwarfs that are inflatedmay be inflated by magnetic interactions or may have thicker clouds.

NLTT5306B: an inflated, weakly irradiated brown dwarf