Impact sculpting of the early martian atmosphere
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916390845284352 |
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| author | Shorttle, Oliver Saeidfirozeh, Homa Rimmer, Paul Laitl, Vojtĕch Kubelík, Petr Petera, Lukáš Ferus, Martin |
| author_facet | Shorttle, Oliver Saeidfirozeh, Homa Rimmer, Paul Laitl, Vojtĕch Kubelík, Petr Petera, Lukáš Ferus, Martin |
| contents | Intense bombardment of solar system planets in the immediate aftermath of protoplanetary disk dissipation has played a key role in their atmospheric evolution. During this epoch, energetic collisions will have removed significant masses of gas from rocky planet atmospheres. Noble gases are powerful tracers of this early atmospheric history, xenon in particular, which on Mars and Earth shows significant depletions and isotopic fractionations relative to the lighter noble gasses. To evaluate the effect of impacts on the loss and fractionation of xenon, we measure its ionization and recombination efficiency by laser shock and apply these constraints to model impact-driven atmospheric escape on Mars. We demonstrate that impact bombardment within the first $200$ to $300\,\text{Myr}$ of solar system history generates the observed Xe depletion and isotope fractionation of the modern martian atmosphere. This process may also explain the Xe depletion recorded in Earth's deep mantle and provides a latest date for the timing of giant planet instability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_07876 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Impact sculpting of the early martian atmosphere Shorttle, Oliver Saeidfirozeh, Homa Rimmer, Paul Laitl, Vojtĕch Kubelík, Petr Petera, Lukáš Ferus, Martin Earth and Planetary Astrophysics Intense bombardment of solar system planets in the immediate aftermath of protoplanetary disk dissipation has played a key role in their atmospheric evolution. During this epoch, energetic collisions will have removed significant masses of gas from rocky planet atmospheres. Noble gases are powerful tracers of this early atmospheric history, xenon in particular, which on Mars and Earth shows significant depletions and isotopic fractionations relative to the lighter noble gasses. To evaluate the effect of impacts on the loss and fractionation of xenon, we measure its ionization and recombination efficiency by laser shock and apply these constraints to model impact-driven atmospheric escape on Mars. We demonstrate that impact bombardment within the first $200$ to $300\,\text{Myr}$ of solar system history generates the observed Xe depletion and isotope fractionation of the modern martian atmosphere. This process may also explain the Xe depletion recorded in Earth's deep mantle and provides a latest date for the timing of giant planet instability. |
| title | Impact sculpting of the early martian atmosphere |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2409.07876 |