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

Poppenhaeger, Katja


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  <dc:creator>Poppenhaeger, Katja</dc:creator>
  <dc:date>2021-10-11</dc:date>
  <dc:description>Contributed talk at PLATO Mission Conference 2021.

Abstract:

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'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.</dc:description>
  <dc:description>Research funded by the German "Leibniz-Gemeinschaft" under project number P67/2018.</dc:description>
  <dc:identifier>https://zenodo.org/record/5562230</dc:identifier>
  <dc:identifier>10.5281/zenodo.5562230</dc:identifier>
  <dc:identifier>oai:zenodo.org:5562230</dc:identifier>
  <dc:relation>doi:10.5281/zenodo.5562229</dc:relation>
  <dc:relation>url:https://zenodo.org/communities/plato2021</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by/4.0/legalcode</dc:rights>
  <dc:title>Habitability and loss of hydrogen-helium atmospheres of small planets - the K dwarf advantage</dc:title>
  <dc:type>info:eu-repo/semantics/lecture</dc:type>
  <dc:type>presentation</dc:type>
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