3 years ago

2MASS J11151597+1937266: A Young, Dusty, Isolated, Planetary-mass Object with a Potential Wide Stellar Companion

We present 2MASS J11151597+1937266, a recently identified low-surface-gravity L dwarf, classified as an L2 γ 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 α emission (EW H α = 560 ± 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 ##IMG## [http://ej.iop.org/images/0004-637X/853/1/75/apjaaa0cfieqn1.gif] {${1724}_{-38}^{+184}\,{\rm{K}}$} . We also provide a revised distance estimate of 37 ± 6 pc using a spectral type–luminosity relationship for low-surface-gravity objects. The three-dimensional galactic velocities and positions o...

Publisher URL: http://iopscience.iop.org/0004-637X/853/1/75

DOI: 10.3847/1538-4357/aaa0cf

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