The difference between the measured atmospheric abundances of neon, argon, krypton and xenon for Venus, the Earth and Mars is striking. Because these abundances drop by at least two orders of magnitude as one moves outward from Venus to Mars, the study of the origin of this discrepancy is a key issue that must be explained if we are to fully understand the different delivery mechanisms of the volatiles accreted by the terrestrial planets. In this work, we aim to investigate whether it is possible to quantitatively explain the variation of the heavy noble gas abundances measured on Venus, the Earth and Mars, assuming that cometary bombardment was the main delivery mechanism of these noble gases to the terrestrial planets. To do so, we use recent dynamical simulations that allow the study of the impact fluxes of comets upon the terrestrial planets during the course of their formation and evolution. Assuming that the mass of noble gases delivered by comets is proportional to rate at which they collide with the terrestrial planets, we show that the krypton and xenon abundances in Venus and the Earth can be explained in a manner consistent with the hypothesis of cometary bombardment. In order to explain the krypton and xenon abundance differences between the Earth and Mars, we need to invoke the presence of large amounts of CO2-dominated clathrates in the Martian soil that would have efficiently sequestered these noble gases.
Response to the Comment by Haack et al. (2015) on the paper by Anfinogenov et al. (2014): John's stone: A possible fragment of the 1908 Tunguska meteorite
The Venus Benchmark: Resolving Degeneracies in Terrestrial Exoplanet Spectra with DAVINCI
University of California, Riverside（加州大学河滨分校）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；Johns Hopkins University Applied Physics Laboratory（约翰斯·霍普金斯大学应用物理实验室）
Super-Earth masses and stellar abundances from NIRPS reveal tentative evidence for water-rich formation around M dwarfs
McMaster University（麦克马斯特大学）；University of Toronto（多伦多大学）；Univ. Grenoble Alpes（格勒诺布尔阿尔卑斯大学）；European Southern Observatory (ESO)（欧洲南方天文台）；Universidade do Porto（波尔图大学）；University of California, Los Angeles（加州大学洛杉矶分校）；McGill University（麦吉尔大学）；Universidad de La Laguna (ULL)（拉帕鲁纳大学）；Universidade Federal do Rio Grande do Norte（北里奥格兰德联邦大学）；University of Bern（伯尔尼大学）；Queen’s University（女王大学）；Royal Military College of Canada（加拿大皇家军事学院）；Lund University（隆德大学）；Light Bridges S.L.（Light Bridges有限公司）；The University of Warwick（华威大学）；University of Chicago（芝加哥大学）
