Photodesorption of water ice from dust grains and thermal desorption of cometary ices studied by the INSIDE experiment

Abstract

A new experimental set-up INterStellar Ice-Dust Experiment (INSIDE), was designed for studying cosmic grain analogues represented by ice-coated carbon- and silicate-based dust grains. In the new instrument, we can simulate physical and chemical conditions prevailing in interstellar and circumstellar environments. The set-up combines ultrahigh vacuum and low temperature conditions with infrared spectroscopy and mass spectrometry. Using INSIDE, we plan to investigate physical and chemical processes, such as adsorption, desorption, and formation of molecules, on the surface of dust/ice samples. First experiments on the photodesorption of water ice molecules from the surface of silicate and carbon grains by UV photons revealed a strong influence of the surface properties on the desorption yield, in particular in the monolayer regime. In the second experiment, the thermal desorption of cometary ice analogues composed of six molecular components was studied for the first time. Co-desorption of CO2 and CH3OH with O2 indicates that at high O2 concentrations in cometary or interstellar ices "heavy" ice molecules can be partly trapped in O2 and release to the gas phase much earlier than expected. This effect could explain astronomical detections of complex organic molecules in cold dense interstellar clouds.

References in corpus (10)

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• Desorption of CO and O2 interstellar ice analogs
• Sensitivity analysis of grain surface chemistry to binding energies of ice species
• Thermal desorption of circumstellar and cometary ice analogs
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• New measurements on water ice photodesorption and product formation under ultraviolet irradiation
• The abundance and thermal history of water ice in the disk surrounding HD142527 from the DIGIT Herschel Key Program
• Thermal desorption of astrophysically relevant molecules from forsterite(010)
• The CO-H2 van der Waals complex and complex organic molecules in cold molecular clouds: a TMC-1C survey

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• Thermal formation of ammonium carbamate on the surface of laboratory analogues of carbonaceous grains in protostellar envelopes and planet-forming disks
• Simple molecules and complex chemistry in a protoplanetary disk: A JWST investigation of the highly inclined disk d216-0939
• Chempl: a playable package for modeling interstellar chemistry
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• Infrared Spectra of Solid-State Ethanolamine: Laboratory Data in Support of JWST Observations
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• FAUST. XXVIII. High-Resolution ALMA Observations of Class 0/I Disks: Structure, Optical Depths, and Temperatures
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