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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>",
"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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