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Prato (Lowell Observatory), Saurav Dhital (Vanderbilt/Boston University), Sebastien Lepine (AMNH)","submitted_at":"2012-08-01T20:09:47Z","abstract_excerpt":"We report the identification of the M9 dwarf SDSS J000649.16-085246.3 as a spectral binary and radial velocity variable with components straddling the hydrogen burning mass limit. Low-resolution near-infrared spectroscopy reveals spectral features indicative of a T dwarf companion, and spectral template fitting yields component types of M8.5\\pm0.5 and T5\\pm1. High-resolution near-infrared spectroscopy with Keck/NIRSPEC reveals pronounced radial velocity variations with a semi-amplitude of 8.2\\pm0.4 km/s. 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