Temperature programed desorption of water ice from the surface of amorphous carbon and silicate grains as related to planet-forming disks

Abstract

Understanding the history and evolution of small bodies, such as dust grains and comets, in planet-forming disks is very important to reveal the architectural laws responsible for the creation of planetary systems. These small bodies in cold regions of the disks are typically considered as mixtures of dust particles with molecular ices, where ices cover the surface of a dust core or are actually physically mixed with dust. Whilst the first case, ice-on-dust, has been intensively studied in the laboratory in recent decades, the second case, ice-mixed-with-dust, present uncharted territory. This work is the first laboratory study of the temperature-programmed desorption (TPD) of water ice mixed with amorphous carbon and silicate grains. We show that the kinetics of desorption of H2O ice depends strongly on the dust/ice mass ratio, probably, due to the desorption of water molecules from a large surface of fractal clusters composed of carbon or silicate grains. In addition, it is shown that water ice molecules are differently bound to silicate grains in contrast to carbon. The results provide a link between the structure and morphology of small cosmic bodies and the kinetics of desorption of water ice included in them.

Submitted to the Astrophysical Journal

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• Photodesorption of water ice from dust grains and thermal desorption of cometary ices studied by the INSIDE experiment
• Dust hot spots at 10 au scales around the Class 0 binary IRAS 16293-2422 A: a departure from the passive irradiation model
• Constraining the detectability of water ice in debris disks
• Thermal formation of ammonium carbamate on the surface of laboratory analogues of carbonaceous grains in protostellar envelopes and planet-forming disks
• Thermal Desorption of H2O-Ice: From Nanoscale Films to the Bulk
• Spectroscopic measurements of CH${}_3$OH in layered and mixed interstellar ice analogues
• Relating grain size distributions in circumstellar discs to the spectral index at millimetre wavelengths
• Accurate sticking coefficient calculation for carbonaceous dust growth through accretion and desorption in astrophysical environments
• Simple molecules and complex chemistry in a protoplanetary disk: A JWST investigation of the highly inclined disk d216-0939
• Laboratory-based sticking coefficients for ices on a variety of small grains analogs
• Exploring refractory organics in extraterrestrial particles
• The Binding Energies of Atoms on Amorphous Silicate Dust: A Computational Study
• Ice coverage of dust grains in cold astrophysical environments
• Protoplanetary Disk Chemistry