Accurate sticking coefficient calculation for carbonaceous dust growth through accretion and desorption in astrophysical environments
Journal article, 2024
Aims. This study is aimed at calculating the sticking coefficients, binding energies, and grain growth rates over a broad range of temperatures, for various gas species interacting with carbonaceous dust grains.
Methods. We performed molecular dynamics simulations with a reactive force field algorithm to compute accurate sticking coefficients and obtain the binding energies. These results were used to build an astrophysical model of nucleation regions to study dust growth. Results. We present, for the first time, the sticking coefficients of H, H2, C, O, and CO on amorphous carbon structures for temperatures ranging from 50 K to 2250 K. In addition, we estimated the binding energies of H, C, and O in carbonaceous dust to calculate the thermal desorption rates. Combining accretion and desorption allows us to determine an effective accretion rate and sublimation temperature for carbonaceous dust.
Conclusions. We find that sticking coefficients can differ substantially from what is commonly used in astrophysical models. This offers us new insights into carbonaceous dust grain growth via accretion in dust-forming regions.
Molecular processes
Methods: numerical
Accretion, accretion disks
Astrochemistry
Dust, extinction
Author
D. Bossion
University of Gothenburg
University of Rennes 1
A. Sarangi
Niels Bohr Institute
Indian Institute of Astrophysics
Susanne Aalto
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Clarke Jarett Esmerian
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
S. R. Hashemi
University of Gothenburg
Kirsten Knudsen
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Wouter Vlemmings
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
G Nyman
University of Gothenburg
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 692 A249The Origin and Fate of Dust in Our Universe
Knut and Alice Wallenberg Foundation (KAW 2019.0443), 2020-06-01 -- 2023-05-31.
Knut and Alice Wallenberg Foundation (KAW 2020.0081), 2021-07-01 -- 2026-06-30.
Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Infrastructure
Chalmers e-Commons
DOI
10.1051/0004-6361/202452362