The role of Fischer-Tropsch catalysis in Jovian subnebular chemistry

Details The role of Fischer-Tropsch catalysis in Jovian subnebular chemistry The role of Fischer-Tropsch catalysis in Jovian subnebular chemistry

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..419m&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We examine the production of methane via Fischer-Tropsch catalysis in an evolving turbulent model of the Jovian subnebula and its implications for the composition of satellitesimals produced in situ. We show that there is a catalytically-active region in the Jovian subnebula from 65 Jupiter radii that moves inwards with time. The pressure range in this region is about 10-4 to 10-3 bar and implies that, if transport processes and the cooling of the subnebula are not considered, CO and CO_2 are entirely converted into CH_4 via Fischer-Tropsch catalysis in about 10^1-10^2 and 10^3-10^4 years, respectively. On the other hand, the comparison of the chemical conversion times with the viscous timescale of the subdisk in the catalytically-active region implies that only CO can be fully converted into CH_4, the conversion of CO_2 thus being restricted to a limited production of CH_4. Moreover, the time required by the Jovian subnebula to cool down from the optimal temperature for Fischer-Tropsch catalysis to the condensation temperature of ices is at least two orders of magnitude higher than the viscous timescale. This implies that any CH_4 produced in the catalytically-active zone will be accreted onto Jupiter long before being incorporated into the forming ices.

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