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

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doi:10.1051/0004-6361/201015104

Sensitive limits on the abundance of cold water vapor in the DM Tauri protoplanetary disk
Journal article, 2010

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.

Author

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Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 521 1 L33+- L33

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1051/0004-6361/201015104

Publication data connected to DOI

More information

Latest update

4/14/2025

Sensitive limits on the abundance of cold water vapor in the DM Tauri protoplanetary disk Journal article, 2010