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The Herschel HIFI water line survey in the low-mass proto-stellar outflow L1448
G. Santangelo, B. Nisini, T. Giannini +8
As part of the WISH (Water In Star-forming regions with Herschel) key project, we report on the observations of several ortho- and para-H2O lines performed with the HIFI instrument…
Water emission from the chemically rich outflow L1157
M. Vasta, C. Codella, A. Lorenzani +7
In the framework of the Herschel-WISH key program, several ortho-H2O and para-H2O emission lines, in the frequency range from 500 to 1700 GHz, were observed with the HIFI instrumen…
Water in star-forming regions with Herschel: highly excited molecular emission from the NGC 1333 IRAS 4B outflow
Gregory J. Herczeg, Agata Karska, Simon Bruderer +9
During the embedded phase of pre-main sequence stellar evolution, a disk forms from the dense envelope while an accretion-driven outflow carves out a cavity within the envelope. Hi…
Detection of the Water Reservoir in a Forming Planetary System
Michiel R. Hogerheijde, Edwin A. Bergin, Christian Brinch +12
Icy bodies may have delivered the oceans to the early Earth, yet little is known about water in the ice-dominated regions of extra-solar planet-forming disks. The Heterodyne Instru…
A single-dish survey of the HCO+, HCN, and CN emission toward the T Tauri disk population in Taurus
D. M. Salter, M. R. Hogerheijde, R. F. J. van der Burg +2
(Abridged) As the stellar X-ray and UV light penetration of a protoplanetary disk depends sensitively on the dust properties, trace molecular species like HCO+, HCN, and CN are exp…
Modelling Herschel observations of hot molecular gas emission from embedded low-mass protostars
R. Visser, L. E. Kristensen, S. Bruderer +6
Aims. Young stars interact vigorously with their surroundings, as evident from the highly rotationally excited CO (up to Eup=4000 K) and H2O emission (up to 600 K) detected by the…
Revisiting the shocks in BHR71: new observational constraints and H2O predictions for Herschel
A. Gusdorf, T. Giannini, D. R. Flower +3
During the formation of a star, material is ejected along powerful jets that impact the ambient material. This outflow phenomenon plays an important role in the regulation of star…
Complex molecules toward low-mass protostars: the Serpens core
Karin I. Oberg, Nienke van der Marel, Lars E. Kristensen +1
Gas-phase complex organic molecules are commonly detected toward high-mass protostellar hot cores. Detections toward low-mass protostars and outflows are comparatively rare, and a…
First hyperfine resolved far-infrared OH spectrum from a star-forming region
S. F. Wampfler, S. Bruderer, L. E. Kristensen +9
OH is an important molecule in the H2O chemistry and the cooling budget of star-forming regions. The goal of the Herschel key program `Water in Star-forming regions with Herschel'…
Water in low-mass star-forming regions with Herschel (WISH-LM): High-velocity H2O bullets in L1448-MM observed with HIFI
L. E. Kristensen, E. F. van Dishoeck, M. Tafalla +4
Herschel-HIFI observations of water in the low-mass star-forming object L1448-MM, known for its prominent outflow, are presented, as obtained within the `Water in star-forming regi…
Distribution and excitation of thermal methanol in 6.7 GHz maser bearing star-forming regions; I. The nearby source Cepheus A
Karl J. E. Torstensson, Floris F. S. van der Tak, Huib Jan van Langevelde +2
The aim of this study is to investigate the distribution and excitation of the methanol gas around Cep A and to describe the physical conditions of the region. In addition the larg…
Energetic processes revealed by spectrally resolved high-J CO lines in low-mass star-forming regions with Herschel-HIFI
Umut A. Yildiz, Ewine F. van Dishoeck, Lars E. Kristensen +5
Herschel-HIFI observations of high-J lines (up to J_u=10) of 12CO, 13CO and C18O are presented toward three deeply embedded low-mass protostars in NGC1333. The observations show se…
Water deuterium fractionation in the low-mass protostar NGC1333-IRAS2A
F. -C. Liu, B. Parise, L. Kristensen +3
Although deuterium enrichment of water may provide an essential piece of information in the understanding of the formation of comets and protoplanetary systems, only a few studies…