Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets

Details Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets

2009-09-22

arxiv.org/abs/0909.4050v1

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

41 pages, 1 table, 7 figures, submitted to Icarus

Scientific paper

We used chemical equilibrium and chemical kinetic calculations to model chemistry of the volatiles released by heating different types of carbonaceous, ordinary and enstatite chondritic material as a function of temperature and pressure. Our results predict the composition of atmospheres formed by outgassing during accretion of the Earth and other terrestrial planets. Outgassing of CI and CM carbonaceous chondritic material produces H2O-rich (steam) atmospheres in agreement with the results of impact experiments. However, outgassing of other types of chondritic material produces atmospheres dominated by other gases. Outgassing of ordinary (H, L, LL) and high iron enstatite (EH) chondritic material yields H2-rich atmospheres with CO and H2O being the second and third most abundant gases. Outgassing of low iron enstatite (EL) chondritic material gives a CO-rich atmosphere with H2, CO2, and H2O being the next most abundant gases. Outgassing of CV carbonaceous chondritic material gives a CO2-rich atmosphere with H2O being the second most abundant gas. Our results predict that the atmospheres formed during accretion of the Earth and Mars were probably H2-rich unless the accreted material was dominantly CI and CM carbonaceous chondritic material. We also predict significant amounts of S, P, Cl, F, Na, and K in accretionary atmospheres at high temperatures (1500-2500 K). Finally, our results may be useful for interpreting spectroscopic observations of accreting extrasolar terrestrial planets.

Affiliated with

Also associated with

No associations

Rating

Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Chemistry of atmospheres formed during accretion of the Earth and other terrestrial planets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-301345