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dc.contributor.authorD'Angelo, Martina
dc.contributor.authorCazaux, Stephanie
dc.contributor.authorKamp, Inga
dc.contributor.authorThi, Wing-Fai
dc.contributor.authorWoitke, Peter
dc.identifier.citationD'Angelo , M , Cazaux , S , Kamp , I , Thi , W-F & Woitke , P 2019 , ' Water delivery in the inner solar nebula : Monte Carlo simulations of forsterite hydration ' , Astronomy & Astrophysics , vol. 622 , A208 .
dc.identifier.otherPURE: 256417551
dc.identifier.otherPURE UUID: 9fee7d83-1da4-42c7-9c7e-e30e3f5e4818
dc.identifier.otherScopus: 85062107764
dc.identifier.otherWOS: 000459092600001
dc.descriptionThis work is part of the Dutch Astrochemistry program financed by the Netherlands Organisation for Scientific Research, NWO.en
dc.description.abstractContext:  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. Aims:  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, constraining the location in the solar nebula where aqueous alteration of silicates by water vapor adsorption could occur efficiently and lead to the formation of phyllosilicates. We analyze the astrophysical conditions favorable for such hydration mechanism and the implications for water on solid bodies. Methods:  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. Results:  Hydration of forsterite surfaces by water vapor adsorption could have occurred within the nebula lifetime already at a density of 108 cm3, 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. Between 0.5 and 10 number of Earth’s oceans can arise from the agglomeration of hydrated 0.1 μm grains into an Earth-sized planet. However, if grain growth occurs dry and water vapor processes the grains afterwards, this value can decrease by two orders of magnitude. Conclusions: 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.
dc.relation.ispartofAstronomy & Astrophysicsen
dc.rightsCopyright © 2018, ESO. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at
dc.subjectSolar nebulaen
dc.subjectWater absorptionen
dc.subjectProtoplanetary disks modelen
dc.subjectMeteorites hydrationen
dc.subjectWater clusteren
dc.subjectMonte Carlo codeen
dc.subjectEarth's wateren
dc.subjectQB Astronomyen
dc.subjectQC Physicsen
dc.titleWater delivery in the inner solar nebula : Monte Carlo simulations of forsterite hydrationen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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