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

Poppenhaeger, Katja


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{
  "description": "<p>Contributed talk at PLATO Mission Conference 2021.</p>\n\n<p>Abstract:</p>\n\n<p>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&#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.</p>", 
  "license": "https://creativecommons.org/licenses/by/4.0/legalcode", 
  "creator": [
    {
      "affiliation": "Leibniz Institute for Astrophysics Potsdam (AIP)", 
      "@id": "https://orcid.org/0000-0003-1231-2194", 
      "@type": "Person", 
      "name": "Poppenhaeger, Katja"
    }
  ], 
  "url": "https://zenodo.org/record/5562230", 
  "datePublished": "2021-10-11", 
  "@context": "https://schema.org/", 
  "identifier": "https://doi.org/10.5281/zenodo.5562230", 
  "@id": "https://doi.org/10.5281/zenodo.5562230", 
  "@type": "PresentationDigitalDocument", 
  "name": "Habitability and loss of hydrogen-helium atmospheres of small planets - the K dwarf advantage"
}
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