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EDP Sciences, Astronomy & Astrophysics, (521), p. L33, 2010

DOI: 10.1051/0004-6361/201015104

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

Journal article published in 2010 by E. A. Bergin, M. R. Hogerheijde, C. Brinch, J. Fogel, U. A. Yildiz, L. E. Kristensen, E. F. van Dishoeck, T. A. Bell, G. A. Blake, E. F. Van~Dishoeck, J. Cernicharo, C. Dominik, D. Lis, G. Melnick, D. Neufeld and other authors.
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

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 3σ levels in 0.5 km s^-1 channels of 4.2 mK for the 1_10-1_01 line and 12.6 mK for the 1_11-0_00 line. We report a very tentative detection, however, of the 1_10-1_01 line in the wide band spectrometer, with a strength of T_mb = 2.7 mK, a width of 5.6 km s^-1 and an integrated intensity of 16.0 mK km s^-1. The latter constitutes a 6σ detection. Regardless of the reality of this tentative detection, model calculations indicate that our sensitive limits on the line strengths preclude efficient desorption of water in the UV illuminated regions of the disk. We hypothesize that more than 95-99% of the water ice is locked up in coagulated grains that have settled to the midplane. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with participation important from NASA.