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Habitability and loss of hydrogen-helium atmospheres of small planets - the K dwarf advantage

Poppenhaeger, Katja


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  <identifier identifierType="DOI">10.5281/zenodo.5562230</identifier>
  <creators>
    <creator>
      <creatorName>Poppenhaeger, Katja</creatorName>
      <givenName>Katja</givenName>
      <familyName>Poppenhaeger</familyName>
      <nameIdentifier nameIdentifierScheme="ORCID" schemeURI="http://orcid.org/">0000-0003-1231-2194</nameIdentifier>
      <affiliation>Leibniz Institute for Astrophysics Potsdam (AIP)</affiliation>
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  <titles>
    <title>Habitability and loss of hydrogen-helium atmospheres of small planets - the K dwarf advantage</title>
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  <publisher>Zenodo</publisher>
  <publicationYear>2021</publicationYear>
  <dates>
    <date dateType="Issued">2021-10-11</date>
  </dates>
  <resourceType resourceTypeGeneral="Text">Presentation</resourceType>
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    <relatedIdentifier relatedIdentifierType="URL" relationType="IsPartOf">https://zenodo.org/communities/plato2021</relatedIdentifier>
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  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by/4.0/legalcode">Creative Commons Attribution 4.0 International</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
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  <descriptions>
    <description descriptionType="Abstract">&lt;p&gt;Contributed talk at PLATO Mission Conference 2021.&lt;/p&gt;

&lt;p&gt;Abstract:&lt;/p&gt;

&lt;p&gt;Evaporation of hydrogen and helium is now directly observable for exoplanets of Jupiter and Neptune size, by using high-resolution spectral observations in the ultraviolet and in the infrared. For even smaller planets, the ongoing loss of a primordial hydrogen-helium atmosphere has not been directly observed yet, but is thought to be relevant for the formation of a habitable atmosphere for life as we know it. The observability of helium escape depends critically on an exoplanet&amp;#39;s irradiation in the high-energy regime. M dwarfs, typically a favourite target for habitable zone exoplanet observations, are at a disadvantage here due to their coronal elemental abundance patterns. However, K dwarfs present a suitable starting point for detecting helium escape from planets in their habitable zones, due to their favorable coronal abundances and their higher magnetic activity level compared to G dwarfs. I will discuss relevant examples and outline the impact that modern high-energy surveys can have on the optimal target selection for observing exoplanetary atmospheric escape.&lt;/p&gt;</description>
    <description descriptionType="Other">Research funded by the German "Leibniz-Gemeinschaft" under project number P67/2018.</description>
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