000005893 001__ 5893
000005893 005__ 20221214234746.0
000005893 037__ $$aPOSTER-2022-0042
000005893 100__ $$aPham, L. B. S. 
000005893 245__ $$aEffects of Asteroid and Comet Impacts on the Atmospheric Evolution of Earth, Mars and Venus 
000005893 260__ $$c2009
000005893 269__ $$c2009-10-12
000005893 520__ $$aEarly in its history, the planets probably had denser atmospheres; Mars for instance had likely an atmosphere with sufficient greenhouse gases for sustaining the presence of stable liquid water at the surface. Impacts by asteroids and comets could have played a significant role in the evolution of the early atmospheres of the Earth, Mars and Venus, not only by causing atmospheric erosion but also by delivering material and volatiles to the planets. We investigate the atmospheric loss and the delivery of volatiles using an analytical model that takes into account the impact simulation results and the flux of impactors given in the literature. The atmospheric loss and the delivery of volatiles are calculated in order to obtain the atmospheric pressure evolution. Our results are compared for the three planets. We have also considered in our scenario, a period with intense bombardment of meteorites that could have increased the atmospheric loss and/or replenishment at the beginning of the history of the terrestrial planets. 
000005893 594__ $$aNO
000005893 6531_ $$aMars
000005893 6531_ $$aVenus
000005893 6531_ $$aEarth
000005893 6531_ $$aAstrobiology
000005893 6531_ $$aImpacts
000005893 6531_ $$aAsteroids
000005893 700__ $$aKaratekin, Ö. 
000005893 700__ $$aDehant, V. 
000005893 773__ $$t9th European Workshop on Astrobiology
000005893 8560_ $$flebinhsan.pham@observatoire.be
000005893 980__ $$aCPOSTER