October 26, 2021 Video/Audio Open Access

Andrew Buchan

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{
  "publisher": "Zenodo", 
  "DOI": "10.5281/zenodo.5600862", 
  "author": [
    {
      "family": "Andrew Buchan"
    }
  ], 
  "issued": {
    "date-parts": [
      [
        2021, 
        10, 
        26
      ]
    ]
  }, 
  "abstract": "<p>The PLATO mission will discover a large number of terrestrial exoplanets, providing measurements of their radii. However, to determine whether an exoplanet is &lsquo;Earth-like&rsquo;, we must also understand its geological composition. The composition of a planet has wide ranging implications for its subsequent evolution and habitability. Ground-based follow-up to the PLATO detections can constrain planet masses and inform our knowledge of planetary interiors. In this talk, I will discuss a complimentary technique that can further improve our understanding of planetary composition and the geology of rocky exoplanets.</p>\n\n<p>Polluted white dwarfs which have accreted fragments of rocky objects provide a unique opportunity to probe exoplanetary interiors. These accreted fragments are often rich in either core-like or mantle-like material, which inform us about the core and mantle compositions we can expect to find in exoplanetary bodies.</p>\n\n<p>In this talk, I will present an approach to modelling the abundances of non-Earth-like core and mantle compositions observed in polluted white dwarfs. We use data from metal-silicate partitioning experiments to calculate the effect of non-Earth-like conditions on the distribution of elements between the core and the mantle. The resulting non-Earth-like compositions may be useful for interior structure models of exoplanets.</p>", 
  "title": "Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants (video)", 
  "type": "motion_picture", 
  "id": "5600862"
}