Water in Star-forming Regions with the Herschel Space Observatory (WISH). I. Overview of Key Program and First Results
Journal article, 2011

Water In Star-forming regions with Herschel (WISH) is a key program on the Herschel Space Observatory designed to probe the physical and chemical structures of young stellar objects using water and related molecules and to follow the water abundance from collapsing clouds to planet-forming disks. About 80 sources are targeted, covering a wide ranee of luminosities-from low (< 1 L-circle dot) to high (> 10(5) L-circle dot)-and a wide range of evolutionary stages-from cold prestellar cores to warm protostellar envelopes and outflows to disks around young stars. Both the HIFI and PACS instruments are used to observe a variety of lines of H2O, (H2O)-O-18 and chemically related species at the source position and in small maps around the protostars and selected outflow positions. In addition, high-frequency lines of CO, (CO)-C-13, and (CO)-O-18 are obtained with Herschel and are complemented by ground-based observations of dust continuum, HDO, CO and its isotopologs, and other molecules to ensure a self-consistent data set for analysis. An overview of the scientific motivation and observational strategy of the program is given, together with the modeling approach and analysis tools that have been developed. Initial science results are presented. These include a lack of water in cold gas at abundances that are lower than most predictions, strong water emission from shocks in protostellar environments, the importance of UV radiation in heating the gas along outflow walls across the full range of luminosities, and surprisingly widespread detection of the chemically related hydrides OH+ and H2O+ in outflows and foreground gas. Quantitative estimates of the energy budget indicate that H2O is generally not the dominant coolant in the warm dense gas associated with protostars. Very deep limits on the cold gaseous water reservoir in the outer regions of protoplanetary disks are obtained that have profound implications for our understanding of grain growth and mixing in disks.

France.

D.] Natl Res Council Canada

protostellar shock

[Johnstone

Herzberg Inst Astrophys

h2o

young stellar objects

molecular clouds

l1157-b1

Victoria

RS INSU

chess spectral survey

ngc-7129 firs 2

hot cores

Floirac

far-infrared observations

UMR 5804

vela

gas-phase

wave-astronomy-satellite

low-mass protostars

Author

E. F. van Dishoeck

Max Planck Institute

Leiden University

L. Kristensen

Leiden University

A. O. Benz

Swiss Federal Institute of Technology in Zürich (ETH)

E. A. Bergin

University Michigan Ann Arbor

P. Caselli

Arcetri Astrophysical Observatory

University of Leeds

J. Cernicharo

CSIC-INTA - Centro de Astrobiologia (CAB)

F. Herpin

Laboratoire d'Astrophysique de Bordeaux

M. R. Hogerheijde

Leiden University

D. Johnstone

National Research Council Canada

University of Victoria

René Liseau

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

B. Nisini

Osservatorio Astronomico di Roma

R. Shipman

SRON Netherlands Institute for Space Research

M. Tafalla

Observatorio Astronomico Nacional

F. F. S. van der Tak

University of Groningen, Kapteyn Astronomical Institute

SRON Netherlands Institute for Space Research

F. Wyrowski

Max Planck Institute

Y. Aikawa

Kobe University

R. Bachiller

Observatorio Astronomico Nacional

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

University of Rome Tor Vergata

Per Bjerkeli

Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics

G. A. Blake

Caltech Division of Geological and Planetary Sciences

S. Bontemps

Laboratoire d'Astrophysique de Bordeaux

J. Braine

Laboratoire d'Astrophysique de Bordeaux

C. Brinch

Leiden University

S. Bruderer

Swiss Federal Institute of Technology in Zürich (ETH)

L. Chavarría

Laboratoire d'Astrophysique de Bordeaux

C. Codella

Arcetri Astrophysical Observatory

F. Daniel

CSIC-INTA - Centro de Astrobiologia (CAB)

T. de Graauw

SRON Netherlands Institute for Space Research

E. Deul

Leiden University

A. M. di Giorgio

University of Rome Tor Vergata

C. Dominik

Astronomical Institute Anton Pannekoek

Radboud University

S. Doty

Denison University

M. L. Dubernet

Universite Pierre et Marie Curie

CNRS Centre National de la Recherche Scientifique

P. Encrenaz

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

H. Feuchtgruber

Max Planck Institute

M. Fich

University of Waterloo

W. Frieswijk

SRON Netherlands Institute for Space Research

A. Fuente

Observatorio Astronomico Nacional

T. Giannini

Osservatorio Astronomico di Roma

J. R. Goicoechea

CSIC-INTA - Centro de Astrobiologia (CAB)

F. P. Helmich

SRON Netherlands Institute for Space Research

G. J. Herczeg

Max Planck Institute

T. Jacq

Laboratoire d'Astrophysique de Bordeaux

J. K. Jorgensen

Kobenhavns Universitet

A. Karska

Max Planck Institute

M. J. Kaufman

San Jose State University

E. Keto

Harvard-Smithsonian Center for Astrophysics

B. Larsson

Stockholm University

B. Lefloch

Université Grenoble Alpes

D. Lis

CalTech

M. Marseille

SRON Netherlands Institute for Space Research

C. McCoey

Western University

University of Waterloo

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

D. A. Neufeld

Johns Hopkins University

Michael Olberg

Chalmers, Earth and Space Sciences, Onsala Space Observatory

L. Pagani

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

O. Panic

European Southern Observatory (ESO)

B. Parise

Max Planck Institute

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

SRON Netherlands Institute for Space Research

D. Salter

Leiden University

J. Santiago-García

Instituto de Radioastronomia Milimetrica

P. Saraceno

University of Rome Tor Vergata

P. Stauber

Swiss Federal Institute of Technology in Zürich (ETH)

T. A. van Kempen

Leiden University

R. Visser

Leiden University

S. Viti

University College London (UCL)

M. Walmsley

Arcetri Astrophysical Observatory

S. F. Wampfler

Swiss Federal Institute of Technology in Zürich (ETH)

U. A. Yildiz

Leiden University

Publications of the Astronomical Society of the Pacific

0004-6280 (ISSN) 1538-3873 (eISSN)

Vol. 123 138-170

Subject Categories

Astronomy, Astrophysics and Cosmology