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Idea 9: Creating a MOSFIRE spectral library of the ultracool Y-dwarfs (Teff>400K). Y-dwarfs share temperatures with giant extrasolar planets. These objects are extremely faint for most of the spectrographs currently available (up to J~23J~22-2423), but could be done with MOSFIRE integrating a couple of hours. There are available around 10 objects for this project.