Peculiar Comets Ejected Early In Solar System Formation

Anderson, Sarah; Petit, Jean-Marc; Noyelles, Benoît; Mousis, O.; Rousselot, Philippe

doi:10.5194/egusphere-egu22-7975

Cited by 2 publications

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Section: Implications For Comet R2mentioning

confidence: 87%

Evolution of the reservoirs of volatiles in the protosolar nebula

Schneeberger,

Mousis,

Aguichine

et al. 2023

Preprint

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The supersolar abundances of volatiles observed in giant planets suggest that a compositional gradient was present at the time of their formation in the protosolar nebula. To explain this gradient, several studies have investigated the radial transport of trace species and the effect of icelines on the abundance profiles of solids and vapors formed in the disk. However, these models only consider the presence of solids in the forms of pure condensates or amorphous ice during the evolution of the protosolar nebula. They usually neglect the possible crystallization and destabilization of clathrates, along with the resulting interplay between the abundance of water and those of these crystalline forms. This study is aimed at pushing this kind of investigation further by considering all possible solid phases together in the protosolar nebula: pure condensates, amorphous ice, and clathrates. To this end, we used a one-dimensional (1D) protoplanetary disk model coupled with modules describing the evolution of trace species in the vapor phase, as well as the dynamics of dust and pebbles. Eleven key species are considered here, including H 2 O, CO, CO 2 , CH 4 , H 2 S, N 2 , NH 3 , Ar, Kr, Xe, and PH 3 . Two sets of initial conditions are explored for the protosolar nebula. In a first scenario, the disk is initially filled with icy grains in the forms of pure condensates. In this case, we show that clathrates can crystallize and form enrichment peaks up to about ten times the initial abundances at their crystallization lines. In a second scenario, the volatiles were delivered to the protosolar nebula in the forms of amorphous grains. In this case, the presence of clathrates is not possible because there is no available crystalline water ice in their formation region. Enrichment peaks of pure condensates also form beyond the snowline up to about seven times the initial abundances. Our model can then be used to compare the compositions of its different volatile reservoirs with those of comet C/2016 R2 PanSTARRS, Jupiter, Uranus, and Neptune. We find that the two investigated scenarios provide compositions of solids and vapors consistent with those observed in the bodies considered.

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Section: Implications For Comet R2mentioning

confidence: 87%

Evolution of the reservoirs of volatiles in the protosolar nebula

Schneeberger,

Mousis,

Aguichine

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Interestingly, our calculated peaks are within a zone of dynamic instability in the early Solar System, which is more likely to result in ejection of planetesimals than capture by the Oort Cloud. This is a possible explanation for the lack of R2-like comets observed today (Anderson et al 2022). and Xe abundances that are ∼1.5 to 6 times higher than the protosolar values (Atreya et al 2003;Wong et al 2004;Mousis et al 2018;Li et al 2020).…”

Section: Implications For Comet R2mentioning

confidence: 87%

Evolution of the reservoirs of volatiles in the protosolar nebula

Schneeberger

Mousis

Aguichine

et al. 2023

A&A

View full text Add to dashboard Cite

The supersolar abundances of volatiles observed in giant planets suggest that a compositional gradient was present at the time of their formation in the protosolar nebula. To explain this gradient, several studies have investigated the radial transport of trace species and the effect of icelines on the abundance profiles of solids and vapors formed in the disk. However, these models only consider the presence of solids in the forms of pure condensates or amorphous ice during the evolution of the protosolar nebula. They usually neglect the possible crystallization and destabilization of clathrates, along with the resulting interplay between the abundance of water and those of these crystalline forms. This study is aimed at pushing this kind of investigation further by considering all possible solid phases together in the protosolar nebula: pure condensates, amorphous ice, and clathrates. To this end, we used a one-dimensional (1D) protoplanetary disk model coupled with modules describing the evolution of trace species in the vapor phase, as well as the dynamics of dust and pebbles. Eleven key species are considered here, including H2O, CO, CO2, CH4, H2S, N2, NH3, Ar, Kr, Xe, and PH3. Two sets of initial conditions are explored for the protosolar nebula. In a first scenario, the disk is initially filled with icy grains in the forms of pure condensates. In this case, we show that clathrates can crystallize and form enrichment peaks up to about ten times the initial abundances at their crystallization lines. In a second scenario, the volatiles were delivered to the protosolar nebula in the forms of amorphous grains. In this case, the presence of clathrates is not possible because there is no available crystalline water ice in their formation region. Enrichment peaks of pure condensates also form beyond the snowline up to about seven times the initial abundances. Our model can then be used to compare the compositions of its different volatile reservoirs with those of comet C/2016 R2 PanSTARRS, Jupiter, Uranus, and Neptune. We find that the two investigated scenarios provide compositions of solids and vapors consistent with those observed in the bodies considered.

show abstract

Peculiar Comets Ejected Early In Solar System Formation

Cited by 2 publications

References 0 publications

Evolution of the reservoirs of volatiles in the protosolar nebula

Evolution of the reservoirs of volatiles in the protosolar nebula

Evolution of the reservoirs of volatiles in the protosolar nebula

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