Composition of Terrestrial Exoplanet Atmospheres from Meteorite Outgassing Experiments
| Autor: | Maggie A. Thompson, Jonathan J. Fortney, David Lederman, Laura Schaefer, Toyanath Joshi, M. Telus |
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| Rok vydání: | 2021 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
010504 meteorology & atmospheric sciences FOS: Physical sciences Astronomy and Astrophysics 01 natural sciences Exoplanet Accretion (astrophysics) Astrobiology Outgassing Meteorite Planet Carbonaceous chondrite 0103 physical sciences astro-ph.EP Environmental science Terrestrial planet 010303 astronomy & astrophysics Chemical composition 0105 earth and related environmental sciences Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Nature Astronomy, vol 5, iss 6 NATURE ASTRONOMY, vol 5, iss 6 |
| DOI: | 10.48550/arxiv.2104.08360 |
| Popis: | Terrestrial exoplanets likely form initial atmospheres through outgassing during and after accretion, although there is currently no first-principles understanding of how to connect a planet's bulk composition to its early atmospheric properties. Important insights into this connection can be gained by assaying meteorites, representative samples of planetary building blocks. We perform laboratory outgassing experiments that use a mass spectrometer to measure the abundances of volatiles released when meteorite samples are heated to 1200 $^{\circ}$C. We find that outgassing from three carbonaceous chondrite samples consistently produce H$_2$O-rich (averaged ~66 %) atmospheres but with significant amounts of CO (~18 %) and CO$_2$ (~15 %) as well as smaller quantities of H$_2$ and H$_2$S (up to 1 %). These results provide experimental constraints on the initial chemical composition in theoretical models of terrestrial planet atmospheres, supplying abundances for principal gas species as a function of temperature. Comment: 42 pages, 9 Figures, 2 Tables, 4 Supplementary Figures, 3 Supplementary Tables, published in Nature Astronomy (2021) |
| Databáze: | OpenAIRE |
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