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Water delivery in the inner solar nebula. Monte Carlo simulations of forsterite hydration
- Source :
- Astronomy and astrophysics, 622(Februari 2019):A208. EDP Sciences
- Publication Year :
- 2019
- Publisher :
- EDP Sciences, 2019.
-
Abstract
- Endogenous or exogenous, dry or wet, various scenarios have been so far depicted for the origin of water on our Solar Systems rocky bodies. Hydrated silicates found in meteorites and in interplanetary dust particles together with observations of abundant water reservoirs in the habitable zone of protoplanetary disks are evidences that support aqueous alteration of silicate dust grains by water vapor condensation in a nebular setting. We investigate the thermodynamics (temperature and pressure dependencies) and kinetics (adsorption rates and energies, surface diffusion and cluster formation) of water adsorption on surfaces of forsterite grains. (abbreviated) The protoplanetary disk model (ProDiMo) code is tuned to simulate the thermochemical disk structure of the early solar nebula at three evolutionary stages. Pressure, temperature and water vapor abundance within 1 au from the protosun were extracted and used as input for a Monte Carlo code to model water associative adsorption using adsorption energies that resemble the forsterite [100] crystal lattice. Hydration of forsterite surfaces by water vapor adsorption could have occurred within the nebula lifetime already at a density of 1e8 cm-3, with increasing surface coverage for higher water vapor densities. Full surface coverage is attained for temperatures lower than 500 K, while for hotter grain surfaces water cluster formation plays a crucial role. (abbreviated) This work shows that water cluster formation enhances the water surface coverage and enables a stable water layer to form at high temperature and low water vapor density conditions. Finally, surface diffusion of physisorbed water molecules shortens the timescale for reaching steady state, enabling phyllosilicate formation within the solar nebula timescale.<br />Comment: A&A accepted
- Subjects :
- 010504 meteorology & atmospheric sciences
Origin of water on Earth
Protoplanetary disks model
planets and satellites: oceans
T-NDAS
FOS: Physical sciences
Astrophysics
Protoplanetary disk
01 natural sciences
Interplanetary dust cloud
Adsorption
0103 physical sciences
planet-star interactions
QB Astronomy
Astrophysics::Solar and Stellar Astrophysics
Solar nebula
Water cluster
010303 astronomy & astrophysics
QC
Physics::Atmospheric and Oceanic Physics
QB
0105 earth and related environmental sciences
Physics
Surface diffusion
Earth and Planetary Astrophysics (astro-ph.EP)
astrochemistry
protoplanetary disks
Meteorites hydration
Astronomy and Astrophysics
molecular processes
QC Physics
Sun: evolution
Space and Planetary Science
Chemical physics
Water absorption
Monte Carlo code
Astrophysics::Earth and Planetary Astrophysics
Formation and evolution of the Solar System
Water vapor
Earth's water
Astrophysics - Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 14320746 and 00046361
- Volume :
- 622
- Database :
- OpenAIRE
- Journal :
- Astronomy & astrophysics
- Accession number :
- edsair.doi.dedup.....422e3c03339d66b8adcc304ee64ad9c9