Presentation Open Access

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

Poppenhaeger, Katja

### Dublin Core Export

<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
<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: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>
</oai_dc:dc>

57
49
views