October 26, 2021 Video/Audio Open Access

Andrew Buchan

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{
  "description": "<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>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Institute of Astronomy, University of Cambridge", 
      "@id": "https://orcid.org/0000-0003-0105-5540", 
      "@type": "Person", 
      "name": "Andrew Buchan"
    }
  ], 
  "url": "https://zenodo.org/record/5600862", 
  "datePublished": "2021-10-26", 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.5600862", 
  "@id": "https://doi.org/10.5281/zenodo.5600862", 
  "@type": "MediaObject", 
  "name": "Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants (video)"
}