Sensitive limits on the abundance of cold water vapor in the DM Tauri protoplanetary disk
Artikel i vetenskaplig tidskrift, 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.
Författare
E. A. Bergin
University of Michigan
M. R. Hogerheijde
Universiteit Leiden
C. Brinch
Universiteit Leiden
J. Fogel
University of Michigan
U. A. Yildiz
Universiteit Leiden
L. Kristensen
Universiteit Leiden
E. F. van Dishoeck
Max-Planck-Gesellschaft
Universiteit Leiden
T. A. Bell
California Institute of Technology (Caltech)
G. A. Blake
Centro de Astrobiologia (CAB)
J. Cernicharo
Anton Pannekoek Institute for Astronomy
C. Dominik
Radboud Universiteit
Anton Pannekoek Institute for Astronomy
D. Lis
California Institute of Technology (Caltech)
G. J. Melnick
Harvard-Smithsonian Center for Astrophysics
D. A. Neufeld
Johns Hopkins University
O. Panić
European Southern Observatory (ESO)
J. C. Pearson
Jet Propulsion Laboratory, California Institute of Technology
R. Bachiller
Observatorio Astronómico Nacional (OAN)
A. Baudry
Universita degli Studi di Roma Tor Vergata
M. Benedettini
Osservatorio Astrofisico di Arcetri
A. O. Benz
Eidgenössische Technische Hochschule Zürich (ETH)
Per Bjerkeli
Chalmers, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik
S. Bontemps
Institut National des Sciences de l'Univers
Laboratoire d'Astrophysique de Bordeaux
J. Braine
University of Leeds
S. Bruderer
Eidgenössische Technische Hochschule Zürich (ETH)
P. Caselli
University of Leeds
Osservatorio Astrofisico di Arcetri
C. Codella
Osservatorio Astrofisico di Arcetri
F. Daniel
Centro de Astrobiologia (CAB)
A. M. di Giorgio
Universita degli Studi di Roma Tor Vergata
S. Doty
Denison University
P. Encrenaz
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
M. Fich
University of Waterloo
A. Fuente
Observatorio Astronómico Nacional (OAN)
T. Giannini
Osservatorio Astronomico di Roma
J. R. Goicoechea
Centro de Astrobiologia (CAB)
T. de Graauw
Netherlands Institute for Space Research (SRON)
F. Helmich
Netherlands Institute for Space Research (SRON)
G. J. Herczeg
Max-Planck-Gesellschaft
F. Herpin
Universita degli Studi di Roma Tor Vergata
T. Jacq
Osservatorio Astrofisico di Arcetri
D. Johnstone
University of Victoria
National Research Council Canada
J. K. Jorgensen
Köpenhamns universitet
B. Larsson
Stockholms universitet
René Liseau
Chalmers, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik
M. Marseille
Netherlands Institute for Space Research (SRON)
C. McCoey
Western University
University of Waterloo
B. Nisini
Universita degli Studi di Roma Tor Vergata
Michael Olberg
Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi
B. Parise
Max-Planck-Gesellschaft
R. Plume
University of Calgary
C. Risacher
Netherlands Institute for Space Research (SRON)
J. Santiago-García
Institut de Radioastronomie Millimétrique (IRAM)
P. Saraceno
Universita degli Studi di Roma Tor Vergata
R. Shipman
Netherlands Institute for Space Research (SRON)
M. Tafalla
Observatorio Astronómico Nacional (OAN)
T. A. van Kempen
Harvard-Smithsonian Center for Astrophysics
R. Visser
Universiteit Leiden
S. F. Wampfler
Eidgenössische Technische Hochschule Zürich (ETH)
F. Wyrowski
Max-Planck-Gesellschaft
F. F. S. van der Tak
Netherlands Institute for Space Research (SRON)
Rijksuniversiteit Groningen
W. Jellema
Netherlands Institute for Space Research (SRON)
Aggm Tielens
Universiteit Leiden
P. Hartogh
Max-Planck-Gesellschaft
J. Stutzki
Universität zu Köln
R. Szczerba
Polish Academy of Sciences
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 521 1 L33+- L33Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1051/0004-6361/201015104