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Origins 2011 – Abstracts

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O7a: Contributed Orals – Past and Present Solar System
Time: Thursday, 07/Jul/2011: 11:45am - 12:30pm
Session Chair: Hikaru Yabuta
Location: Auditorium Pasteur


Emergence of life: its record still preserved at Mars?

Jean-Pierre Bibring

Institut d'Astrophysique Spatiale, France

If life emerged other than on Earth, in the Solar System, it most likely happened on Mars. It has recently been discovered that Mars might have kept the record of this evolutionary step, and preserved indicators of the processes involved: their deciphering would then provide unique clues with relevance to the question of the origin of life, at Mars and also on Earth.

The evolution of Titan's aerosol analogues in putative liquid water-ammonia bodies

Sandra Ramírez1, Olivier Poch2, Patrice Coll2, Arnaud Buch3, Francois Raulin2

1Universidad Autonoma del Estado de Morelos, Mexico; 2Université Paris Est Creteil et Université Paris Diderot, France; 3Ecole Centrale Paris, France

We report the chemical transformation of Titan’s aerosol analogues when placed in conditions that resemble putative liquid water-ammonia bodies likely to be present at the surface or subsurface of Titan. The aerosol analogues were mixed with pure water or aqueous ammonia solutions at different concentrations and placed at temperature conditions close to those of Titan’s environment. By GC-MS analysis we found derived residues related to amino acids, a nucleobase, as well as urea.

Interplanetary dust particles of cometary origin, as a possible source of complex carbonaceous compounds on terrestrial planets in the early solar system

Anny-Chantal Levasseur-Regourd1, Jérémie Lasue2, Yann Brouet3

1UPMC (Univ. Paris 6) LATMOS Paris France; 2ISR-1 D-466 LANL NM USA, LPI Houston TX USA; 3Observatoire de Paris LERMA Paris France

During the Late Heavy Bombardment, interplanetary dust particles of cometary origin might, because of their structure and composition, have significantly contributed to the enrichment of the Earth (and other telluric planets) in complex carbonaceous compounds, necessary for the apparition of life. New studies on the origin of interplanetary dust, together with computations of meteoritic ablation and simulations of atmospheric entry of fluffy particles, strongly reinforce this hypothesis.