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We report the discovery of the L dwarf WISE J174102.78$-$464225.5, that wasdiscovered as part of a search for nearby L dwarfs using the Wide-fieldInfrared Survey Explorer (WISE). The distinct triangular peak of the H-bandportion of its near-infrared spectrum and its red near-infrared colors ($J-K_S$= 2.35$\pm$0.08 mag) are indicative of a young age. Via comparison to spectralstandards and other red L dwarfs, we estimate a near-infrared spectral type tobe L7$\pm$2 (pec). From a comparison to spectral and low-mass evolutionarymodels, we determine self-consistent effective temperature, log $g$, age, andmass values of 1450$\pm$100 K, 4.0$\pm$0.25 (cm s$^{-2}$), 10-100 Myr, and 4-21M$_{Jup}$, respectively. With an estimated distance of 10-30 pc, we explore thepossibility that WISE J174102.78-464225.5 belongs to one of the young nearbymoving groups via a kinematic analysis and we find potential membership in the$\beta$ Pictoris or AB Doradus associations. A trigonometric parallaxmeasurement and a precise radial velocity can help to secure its membership ineither of these groups.

Discovery of the Young L Dwarf WISE J1741102.78-464225.5