RECONNAISSANCE OF THE HR 8799 EXOSOLAR SYSTEM. I. NEAR-INFRARED SPECTROSCOPY. - OPPENHEIMER, B. R.; BARANEC, C.; BEICHMAN, C.; BRENNER, D.; BURRUSS, R.; CADY, E.; CREPP, J. R.; DEKANY, R.; FERGUS, R.; HALE, D.; HILLENBRAND, L.; HINKLEY, S.; et al. (Astrophysical Journal, 2013)