2010A&A...521L..33B

Query : 2010A&A...521L..33B

2010A&A...521L..33B - Astronomy and Astrophysics, volume 521, L33-33 (2010/10-1)

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

BERGIN E.A., HOGERHEIJDE M.R., BRINCH C., FOGEL J., YILDIZ U.A., KRISTENSEN L.E., VAN DISHOECK E.F., BELL T.A., BLAKE G.A., CERNICHARO J., DOMINIK C., LIS D., MELNICK G., NEUFELD D., PANIC O., PEARSON J.C., BACHILLER R., BAUDRY A., BENEDETTINI M., BENZ A.O., BJERKELI P., BONTEMPS S., BRAINE J., BRUDERER S., CASELLI P., CODELLA C., DANIEL F., DI GIORGIO A.M., DOTY S.D., ENCRENAZ P., FICH M., FUENTE A., GIANNINI T., GOICOECHEA J.R., DE GRAAUW T., HELMICH F., HERCZEG G.J., HERPIN F., JACQ T., JOHNSTONE D., JORGENSEN J.K., LARSSON B., LISEAU R., MARSEILLE M., McCOEY C., NISINI B., OLBERG M., PARISE B., PLUME R., RISACHER C., SANTIAGO-GARCIA J., SARACENO P., SHIPMAN R., TAFALLA M., VAN KEMPEN T.A., VISSER R., WAMPFLER S.F., WYROWSKI F., VAN DER TAK F., JELLEMA W., TIELENS A.G.G.M., HARTOGH P., STUETZKI J. and SZCZERBA R.

Abstract (from CDS):

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 0.5km/s channels of 4.2mK for the 1₁₀-1₀₁ line and 12.6mK for the 1₁₁-0₀₀ line. We report a very tentative detection, however, of the 1₁₀-1₀₁ line in the wide band spectrometer, with a strength of T_mb=2.7mK, a width of 5.6km/s and an integrated intensity of 16.0mK.km/s. 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.

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Journal keyword(s): ISM: abundances - ISM: molecules - protoplanetary disks

Simbad objects: 2

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Number of rows : 2

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	V* DM Tau	Or*	04 33 48.7336763736	+18 10 09.973460280	14.30	14.82	14.00			M2Ve	623	0
2	HD 97048	Ae*	11 08 03.3109731720	-77 39 17.490777444	9.03	8.76	9.00		8.64	A0Vep	535	0

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