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L. Prato (UCLA), M. Simon (SUNY Stony Brook), T. Mazeh (Tel Aviv University), I. S. McLean (UCLA), D. Norman (SUNY Stony Brook), S. Zucker (Tel Aviv University)
Using high resolution, R=24,000, near-infrared H band spectroscopy with NIRSPEC at Keck II, we detected the cool secondary components in visual wavelength identified pre-main-sequence, single-lined spectroscopic binaries. The mass ratio for one young binary, NTTS 160905-1859, is M2/M1=0.18+/-0.01, the smallest yet measured dynamically for a pre-main-sequence spectroscopic system. Our results demonstrate the power of infrared spectroscopy for the dynamical identification of cool secondaries. We compare our observations with a compilation of the published young double-lined spectroscopic binaries and discuss our unique contribution to this sample.