Search Publications
LIDA: The Leiden Ice Database for Astrochemistry
van Dishoeck, E. F.; Rocha, W. R. M.; Rachid, M. G. +3 more
Context. High-quality vibrational spectra of solid-phase molecules in ice mixtures and for temperatures of astrophysical relevance are needed to interpret infrared observations toward protostars and background stars. Such data are collected worldwide by several laboratory groups in support of existing and upcoming astronomical observations. Over t…
HI-H2 transition: Exploring the role of the magnetic field. A case study toward the Ursa Major cirrus
Blinov, D.; Panopoulou, G. V.; Gong, Y. +6 more
Context. Atomic gas in the diffuse interstellar medium (ISM) is organized in filamentary structures. These structures usually host cold and dense molecular clumps. The Galactic magnetic field is considered to play an important role in the formation of these clumps.
Aims: Our goal is to explore the role of the magnetic field in the HI
Influence of grain growth on CO2 ice spectroscopic profiles. Modelling for dense cores and disks
Ysard, N.; Dartois, E.; Noble, J. A. +2 more
Context. Interstellar dust grain growth in dense clouds and protoplanetary disks, even when moderate, affects the observed interstellar ice profiles as soon as a significant fraction of dust grains are in the size range close to the wave vector at the considered wavelength. The continuum baseline correction made prior to analysing ice profiles inf…
Measuring chemical abundances in AGN from infrared nebular lines: HII-CHI-MISTRY-IR for AGN
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +1 more
Context. Future and ongoing infrared and radio observatories such as JWST, METIS, and ALMA will increase the amount of rest-frame IR spectroscopic data for galaxies by several orders of magnitude. While studies of the chemical composition of the interstellar medium (ISM) based on optical observations have been widely spread over decades for star-f…
Infrared spectra of complex organic molecules in astronomically relevant ice mixtures. V. Methyl cyanide (acetonitrile)
Rocha, W. R. M.; Rachid, M. G.; Linnartz, H.
Context. The increasing sensitivity and resolution of ground-based telescopes have enabled the detection of gas-phase complex organic molecules (COMs) across a variety of environments. Many of the detected species are expected to form on the icy surface of interstellar grains and transfer later into the gas phase. Therefore, icy material is regard…
First detection of AlF line emission towards M-type AGB stars
Fonfría, J. P.; Velilla-Prieto, L.; Wedemeyer, S. +3 more
The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their contribution to the total F budget is not fully known due to the lack of observations. In this paper, we report the detection of aluminium monofluoride (AlF) line emission, …
The CH4 abundance in Jupiter's upper atmosphere
Sánchez-López, A.; Snellen, I. A. G.; López-Puertas, M. +3 more
Hydrocarbon species, and in particular CH4, play a key role in the stratosphere-thermosphere boundary of Jupiter, which occurs around the µ-bar pressure level. Previous analyses of solar occultation, He and Ly-α airglow, and ISO/SWS measurements of the radiance around 3.3 µm have inferred significantly different methane conc…
The mid-infrared aliphatic bands associated with complex hydrocarbons
Peeters, E.; Sloan, G. C.; Stock, D. J. +2 more
Context. The mid-infrared emission features commonly attributed to polycyclic aromatic hydrocarbons (PAHs) vary in profile and peak position. These profile variations form the basis of their classification: Classes A, B, C reflect profiles with increasing central wavelength while Class D has similar central wavelength as Class B but a similar broa…
Radial distribution of the carbonaceous nano-grains in the protoplanetary disk around HD 169142
Di Folco, Emmanuel; Devinat, Marie; Habart, Émilie +4 more
Context. HD 169142 is part of the class of (pre-)transitional protoplanetary disks showing multiple carbon nanodust spectroscopic signatures (aromatic, aliphatic) dominating the infrared spectrum. Precise constraints on the spatial distribution and properties of carbonaceous dust particles are essential to understanding the physics, radiative tran…
Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSE
Meisenheimer, K.; Augereau, J. -C.; Wolf, S. +50 more
Context. Asymptotic giant branch (AGB) stars are one of the main sources of dust production in the Galaxy. However, it is not yet clear what this process looks like and where the dust happens to be condensing in the circumstellar environment.
Aims: By characterizing the location of the dust and the molecules in the close environment of an AGB…