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Direct-imaging searches for planets reveal wide orbit planets amenable tospectroscopy, and their atmospheres represent an important comparison to theirradiated atmospheres of Hot Jupiters. Using AO integral field spectroscopy of2M1207 b, the shape of the continuum emission over the J, H, and K bands fromthe atmosphere of this young, planetary mass companion is measured in order tocompare with atmospheric and evolutionary models, and objects of similartemperature in young clusters and the field. The 2M1207 b spectrum has thehighest spectral resolution (R~300-1500) and largest wavelength coverage,including the first J-band spectrum, for this benchmark object. The highsignal-to-noise of the data allow a clear identification of signatures of lowsurface gravity, and comparison with a grid of AMES-Dusty models reveals abest-fit effective temperature of Teff=1600 K with a preferred surface gravityof log g=4.5. The J-band flux is depressed relative to nearly all L-typeobjects, and the detailed shape of the absorption features across the H-bandexhibit differences from the model predictions. The possible origins of 2M1207b and its low luminosity are examined with the new data and analysis whichsuggest that extinction from a disk with large grains is a viable scenario andis preferred over scatttering off an optically thick disk. The 2M1207 bspectrum presents an important comparison for the types of features which maybe present in upcoming spectra of the atmospheres of planets imaged in orbitaround stellar primaries.

The highest resolution near-IR spectrum of the imaged planetary mass companion 2M1207 b