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A study of deuterated water in the low-mass protostar IRAS 16293-2422
Context. Water is a primordial species in the emergence of life, and comets may have brought a large fraction to Earth to form the oceans. To understand the evolution of water from the first stagesExpand
The 15N-enrichment in dark clouds and Solar System objects
Abstract The line intensities of the fundamental rotational transitions of H13CN and HC15N were observed towards two prestellar cores, L183 and L1544, and lead to molecular isotopic ratios 140 ⩽Expand
Collisional excitation of water in warm astrophysical media - I. Rate coefficients for rovibrationally excited states
Context: The interpretation of water line emission from infrared and submillimetre observations requires a detailed knowledge of collisional rate coefficients over a wide range of levels andExpand
CH3OH abundance in low mass protostars
We present observations of methanol lines in a sample of Class 0 low mass protostars. Using a 1-D radiative transfer model, we derive the abundances in the envelopes. In two sources of the sample,Expand
A full nine-dimensional potential-energy surface for hydrogen molecule-water collisions.
TLDR
A full nine-dimensional interaction potential for H2O-H2 calibrated using high-accuracy, explicitly correlated wave functions and all degrees of freedom are included using a systematic procedure transferable to other small molecules of astrophysical or atmospherical relevance. Expand
Refractory and semi-volatile organics at the surface of comet 67P/Churyumov-Gerasimenko: Insights from the VIRTIS/Rosetta imaging spectrometer
Abstract The VIRTIS (Visible, Infrared and Thermal Imaging Spectrometer) instrument aboard the Rosetta spacecraft has performed extensive spectral mapping of the surface of cometExpand
METHANOL EMISSION FROM LOW MASS PROTOSTARS
We present observations of methanol lines in a sample of Class 0 low mass protostars. Using a 1-D radiative transfer model, we derive the abundances in the envelopes. In two sources of the sample,Expand
ORTHO-PARA SELECTION RULES IN THE GAS-PHASE CHEMISTRY OF INTERSTELLAR AMMONIA
The ortho-para chemistry of ammonia in the cold interstellar medium is investigated using a gas-phase chemical network. Branching ratios for the primary reaction chain involved in the formation andExpand
Collisional excitation of sulfur dioxide in cold molecular clouds
We present collisional rate coefficients for SO2 with ortho and para molecular hydrogen for the physical conditions prevailing in dark molecular clouds. Rate coefficients for thefirst 31 rotationalExpand
Direct evidence of multiple reservoirs of volatile nitrogen in a protosolar nebula analogue
Isotopic ratios are keys to understanding the origin and early evolution of the solar system in the context of Galactic nucleosynthesis. The large range of measured $^{14}$N/$^{15}$N isotopic ratiosExpand
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