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Unraveling the chemical history of the Solar System as recorded in extraterrestrial organic matter

Published online by Cambridge University Press:  01 February 2008

George D. Cody
Affiliation:
GL, Carnegie Institution of Washington, 5251 Broad Branch, Washington DC 20015, USA email: g.cody@gl.ciw.edu, hyabuta@gl.ciw.edu
Conel M. O'D. Alexander
Affiliation:
DTM, Carnegie Institution of Washington, 5241 Broad Branch, Washington DC 20015, USA email: alexande@dtm.ciw.edu
A. L. David Kilcoyne
Affiliation:
Advanced Light Sorce, Lawrence Berkeley Laboratory, Berkeley CA, USA email: alkilkoyne@lbl.gov
Hikaru Yabuta
Affiliation:
GL, Carnegie Institution of Washington, 5251 Broad Branch, Washington DC 20015, USA email: g.cody@gl.ciw.edu, hyabuta@gl.ciw.edu
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Abstract

We have initiated an extensive program of molecular analysis of extraterrestrial organic matter isolated from a broad range of meteorites (spanning multiple classes, groups, and petrologic types), including recent molecular spectroscopic analyses of the organic matter in the Comet 81P/Wild 2 samples. The results of these analyses clearly reveal the signature of multiple reaction pathways that transformed extraterrestrial organic matter away from its primitive roots. The most significant molecular transformation occurred in the post-accretionary phase of the parent body. However, each of the various chemical transformation trajectories point unambiguously back to a common primitive origin. Applying a wide range of spectroscopic techniques we find that the primitive organic precursor is striking in its chemical complexity exhibiting a broad array of oxygen- and nitrogen-bearing functional groups. The π-bonded carbon exists as predominately highly substituted single ring aromatics, there exists no evidence for abundant, large, polycyclic aromatic hydrocarbons (PAHs). We find that the molecular structure of primitive extraterrestrial organics is consistent with synthesis from small reactive molecules, e. g. formaldehyde, whose random condensation and subsequent rearrangement chemistry at low temperatures leads to a highly cross-linked macromolecule.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

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