We present 2MASS J11151597+1937266 , a recently identified low-surface gravity L dwarf , classified as an L2 \gamma based on Sloan Digital Sky Survey optical spectroscopy .
We confirm this spectral type with near-infrared spectroscopy , which provides further evidence that 2MASS J11151597+1937266 is a low-surface gravity L dwarf .
This object also shows significant excess mid-infrared flux , indicative of circumstellar material ; and its strong H \alpha emission ( EW _ { \mathrm { H } \alpha } = 560 \pm 82 Å ) is an indicator of enhanced magnetic activity or weak accretion .
Comparison of its spectral energy distribution to model photospheres yields an effective temperature of 1724 ^ { +184 } _ { -38 } K. We also provide a revised distance estimate of 37 \pm 6 pc using a spectral type–luminosity relationship for low-surface gravity objects .
The 3-dimensional galactic velocities and positions of 2MASS J11151597+1937266 do not match any known young association or moving group .
Assuming a probable age in the range of 5–45 Myr , the model-dependent estimated mass of this object is between 7–21 M _ { \mathrm { Jup } } , making it a potentially isolated planetary-mass object .
We also identify a candidate co-moving , young stellar companion , 2MASS J11131089+2110086 .