Abstract
We present the latest results from the Mission Program NIRLT, the NIR spectroscopic observations of brown dwarfs using the IRC on board AKARI. The near-infrared spectra in the wavelength range between 2.5 and is especially important to study the brown dwarf atmospheres because of the presence of non-blended bands of major molecules, including at , at , CO at and around . Our observations were carried out in the grism-mode resulting in a spectral resolution of ~ 120. In total, 27 sources were observed and 18 good spectra were obtained. We investigate the behavior of three molecular absorption bands, CO, and , in brown dwarf spectra relative to their spectral types. We find that the band appears in the spectra of dwarfs later than L5 and CO band is seen in the spectra of all spectral types. is detected in the spectra of late-L and T type dwarfs.
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