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Article
Open AccessAuthor Correction: Outflows from the youngest stars are mostly molecular
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Article
Open AccessOutflows from the youngest stars are mostly molecular
The formation of stars and planets is accompanied not only by the build-up of matter, namely accretion, but also by its expulsion in the form of highly supersonic jets that can stretch for several parsecs1,2. As ...
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Article
Open AccessWater in the terrestrial planet-forming zone of the PDS 70 disk
Terrestrial and sub-Neptune planets are expected to form in the inner (less than 10 au) regions of protoplanetary disks1. Water plays a key role in their formation2–4, although it is yet unclear whether water mol...
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Article
A rich hydrocarbon chemistry and high C to O ratio in the inner disk around a very low-mass star
Carbon is an essential element for life but how much can be delivered to young planets is still an open question. The chemical characterization of planet-forming disks is a crucial step in our understanding of...
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Article
An Ice Age JWST inventory of dense molecular cloud ices
Icy grain mantles are the main reservoir of the volatile elements that link chemical processes in dark, interstellar clouds with the formation of planets and the composition of their atmospheres. The initial i...
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Chapter and Conference Paper
Formation of Complex Molecules in the Translucent Phase via “non-energetic” Processing on C \(_\textbf{2}\) H \(_\textbf{2}\) Ice
Interstellar complex organic molecules (COMs) have been identified toward various star-forming regions, and their formation mechanisms have been extensively studied in astrochemistry. However, the icy origin o...
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Article
A non-energetic mechanism for glycine formation in the interstellar medium
The detection of the amino acid glycine and its amine precursor methylamine on the comet 67P/Churyumov-Gerasimenko by the Rosetta mission provides strong evidence for a cosmic origin of amino acids on Earth. H...
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Article
An experimental study of the surface formation of methane in interstellar molecular clouds
Methane is one of the simplest stable molecules that is both abundant and widely distributed across space. Observational surveys of CH4 ice towards low- and high-mass young stellar objects showed that much of the...
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Article
Abundant molecular oxygen in the coma of comet 67P/Churyumov–Gerasimenko
In situ measurement of O2 in the coma of comet 67P/Churyumov–Gerasimenko shows local abundances ranging from one per cent to ten per cent relative to H2O; the spatial and temporal uniformity of the O2/H2O ratio s...
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Chapter and Conference Paper
Building Complex Molecules During Star- and Planet Formation: Synergy of Infrared and Millimeter Observations
The potential of current and future infrared and millimeter facilities to provide an inventory of the gases and solids during star- and planet formation is discussed, and the evolutionary pathways to complex, ...
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Chapter and Conference Paper
Molecular Astrophysics: An Integral Part of Astronomy
In 1986, Dalgarno wrote a paper with the provocative title ‘Is interstellar chemistry useful?’.The purpose of this brief review is to show that this question can now indeed be answered with a resounding ‘yes!’...
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Article
Detection of DCO+ in a circumstellar disk
We report the first detection of DCO+ in a circumstellar disk. The DCO+ J=5–4 line at 360.169 GHz is observed with the 15 m James Clerk Maxwell Telescope in the disk around the pre-main sequence star TW Hya. Toge...
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Article
Substantial reservoirs of molecular hydrogen in the debris disks around young stars
Circumstellar accretion disks transfer matter from molecular clouds to young stars and to the sites of planet formation. The disks observed around pre-main-sequence stars have properties consistent with those ...
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Chapter
Search for H2 Emission from Disks Around T Tauri and Herbig Ae Stars
Preliminary results are presented of observations of the pure rotational lines of H2 toward T Tauri and Herbig Ae stars using the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). The s...
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Chapter
ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33A
ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.40 µm. The position and width of these features indicates that they are due to...
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Chapter
Evolution of Southern Star-Forming Regions
We present ISO observations of bright, high-mass southern star-forming regions with the Short Wavelength Spectrometer (SWS) and Long Wavelength Spectrometer (LWS). The selected targets show a range of pre-main...
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Article
Search for H2 Emission from Disks around T Tauri and Herbig AE Stars
Preliminary results are presented of observations of the pure rotational lines of H2 toward T Tauri and Herbig Ae stars using the Short Wavelength Spectrometer (SWS) on the Infrared Space Observatory (ISO). Th...
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Article
ISO-SWS Observations of Weak Bands of Trace Components of Ices Towards the Young Stellar Object W 33A
ISO-SWS observations of the highly obscured young stellar object W 33A reveal two broad absorption features centered at 7.24 and 7.40 µm. The position and width of these features indicates that they are due to...
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Article
Evolution of Southern Star-Forming Regions
We present ISO observations of bright, high-mass southern starforming regions with the Short Wavelength Spectrometer (SWS) and Long Wavelength Spectrometer (LWS). The selected targets show a range of pre-main ...
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Chapter
Interstellar Matter Matiere Interstellaire
This report covers some of the developments in the field of Commission 34, between the summer of 1993 and 1996. My predecessor, Harm Habing, noted in the last report, published in 1994, “that the traditional w...
