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Zoekopdracht: faculteit: "FNWI" en publicatiejaar: "2010"

AuteursE.A. Bergin, M.R. Hogerheijde, C. Brinch, J. Fogel, U.A. Yıldız, L.E. Kristensen, E.F. van Dishoeck, T.A. Bell, G.A. Blake, J. Cernicharo, C. Dominik, D. Lis, G. Melnick, D. Neufeld, O. Panić, J.C. Pearson, R. Bachiller, A. Baudry, M. Benedettini, A.O. Benz, P. Bjerkeli, S. Bontemps, J. Braine, S. Bruderer, P. Caselli, C. Codella, F. Daniel, A.M. Di Giorgio, S.D. Doty, P. Encrenaz, M. Fich, A. Fuente, T. Giannini, J.R. Goicoechea, T. de Graauw, F. Helmich, G.J. Herczeg, F. Herpin, T. Jacq, D. Johnstone, J.K. Jørgensen, B. Larsson, R. Liseau, M. Marseille, C. McCoey, B. Nisini, M. Olberg, B. Parise, R. Plume, C. Risacher, J. Santiago-García, P. Saraceno, R. Shipman, M. Tafalla, T.A. van Kempen, R. Visser, S.F. Wampfler, F. Wyrowski, F. van der Tak, W. Jellema, A.G.G.M. Tielens, P. Hartogh, J. Stützki, R. Szczerba
TitelSensitive limits on the abundance of cold water vapor in the DM Tauri protoplanetary disk
TijdschriftAstronomy & Astrophysics
Jaargang521
Jaar2010
Pagina'sL33-
ISSN00046361
FaculteitFaculteit der Natuurwetenschappen, Wiskunde en Informatica
Instituut/afd.FNWI: Astronomical Institute Anton Pannekoek (IAP)
SamenvattingWe 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 3 sigma 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 6 sigma 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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