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Cernicharo, J.C. Pearson, J. Fogel, J.K. Jorgensen, J.R. Goicoechea, J. Santiago-Garcia, J. Stutzki, L.E. Kristensen, M. Benedettini, M. Fich, M. Marseille, M. Olberg, M.R. Hogerheijde, M. Tafalla, O. Panic, P. Bjerkeli, P. Caselli, P. Encrenaz, P. Hartogh, P. Saraceno, R. Bachiller, R. Liseau, R. Plume, R. Shipman, R. Szczerba, R. Visser, S. Bontemps, S. Bruderer, S.D. Doty, S.F. Wampfler, T.A. Bell, T.A. van Kempen, T. Giannini, Th. de Graauw, T. Jacq, U.A. Yildiz, W. Jellema","submitted_at":"2010-07-13T15:53:56Z","abstract_excerpt":"We performed a sensitive search for the ground-state emission lines of ortho- and para-water vapor in the DM Tau protoplanetary disk using the Herschel/HIFI instrument. No strong lines are detected down to 3sigma levels in 0.5 km/s channels of 4.2 mK for the 1_{10}--1_{01} line and 12.6 mK for the 1_{11}--0_{00} line. 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