Chemical evolution of CO2 ices under processing by ionizing radiation: characterization of nonobserved species and chemical equilibrium phase with the employment of PROCODA Code

Laboratory astrophysics and astrochemistr

JOYS: Disentangling the warm and cold material in the high-mass IRAS 23385+6053 cluster

Interstellar matter and star formatio

Infrared Complex Refractive Index of N-containing astrophysical ices free of water processed by cosmic-ray simulated in laboratory

International audienceSeveral nitrogen-containing molecules have been unambiguously identified in the Solar System and in theInterstellar Medium. It is believed that such a rich inventory of species is a result of the energetic processingof astrophysical ices during the interaction with ionizing radiation. An intrinsic parameter of matter, thecomplex refractive index, stores all the “chemical memory” triggered by energetic processing, and thereforemight be used to probe ice observations in the infrared. In this study, four N-containing ices have been condensedin an ultra-high vacuum chamber and processed by heavy ions (O and Ni) with energies between0.2 and 15.7MeV at the Grand Accélérateur National d’Ions Lourds (GANIL), in Caen, France. All chemicalchanges were monitored in situ by Infrared Absorption Spectroscopy. The complex refractive index was calculateddirectly from the absorbance spectrum, by using the Lambert-Beer and Kramers-Kroning relations,and the values are available in an online database: https://www1.univap.br/gaa/nkabs-database/data.htm.As a result, other than the database, it was observed that non-polar ices are more destroyed by sputteringthan polar ones. Such destruction and chemical evolution lead to variation in the IR albedo of samplesaddressed in this paper

Spectroscopic diagnostics of the mid-infrared features of the dark globule DC 314.8-5.1 with the Spitzer Space Telescope

Interstellar matter and star formatio

LIDA: the Leiden ice database for astrochemistry

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 the last 25 yr, the Laboratory for Astrophysics at Leiden Observatory has provided more than 1100 (high-resolution) spectra of diverse ice samples. Aims. In time with the recent launch of the James Webb Space Telescope, we have fully upgraded the Leiden Ice Database for Astrochemistry (LIDA) adding recently measured spectra. The goal of this paper is to describe what options exist regarding accessing and working with a large collection of infrared (IR) spectra, and the ultraviolet-visible (UV/vis) to the mid-infrared refractive index of H2O ice. This also includes astronomy-oriented online tools to support the interpretation of IR ice observations. Methods. This ice database is based on open-source Python software, such as Flas