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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/HIFIinstrument. No strong lines are detected down to 3sigma levels in 0.5 km/schannels of 4.2 mK for the 1_{10}--1_{01} line and 12.6 mK for the1_{11}--0_{00} line. We report a very tentative detection, however, of the1_{10}--1_{01} line in the Wide Band Spectrometer, with a strength ofT_{mb}=2.7 mK, a width of 5.6 km/s and an integrated intensity of 16.0 mK km/s.The latter constitutes a 6sigma detection. Regardless of the reality of thistentative detection, model calculations indicate that our sensitive limits onthe line strengths preclude efficient desorption of water in the UV illuminatedregions of the disk. We hypothesize that more than 95-99% of the water ice islocked up in coagulated grains that have settled to the midplane.

Sensitive limits on the abundance of cold water vapor in the DM Tau protoplanetary disk