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Titel
The Radiation Impact of Active Galactic Nuclei at z<0.5 on the Milky Way's Planetary Atmospheres
VerfasserWislocka, Agata
Betreuer / BetreuerinnenKovacevic, Andjelka
Erschienen2018
HochschulschriftInnsbruck, Univ., Masterarb., 2018
Datum der AbgabeSeptember 2018
SpracheEnglisch
DokumenttypMasterarbeit
Schlagwörter (DE)AGNs / planetary atmospheres / hydrodynamic wind / XUV radiation / habitability
Schlagwörter (EN)AGNs / planetary atmospheres / hydrodynamic wind / XUV radiation / habitability
URNurn:nbn:at:at-ubi:1-28504 Persistent Identifier (URN)
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 Das Werk ist frei verfügbar
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The Radiation Impact of Active Galactic Nuclei at z<0.5 on the Milky Way's Planetary Atmospheres [8.33 mb]
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Zusammenfassung (Englisch)

The influence of the parent star on its planet(s) atmospheric evolution has been studied for decades. Here we take a new approach and present the analysis, using real exoplanet and Active Galactic Nucleus (AGN) data, of exoplanet atmospheric erosion due to X-ray and Ultra Violet (XUV) radiation by: Case 1) the Milky Way Galaxy's central supermassive black hole, Sagittarius A* (Sgr A*), and Case 2) the nearby AGNs, at z<0.5. We compiled data for exoplanets, with a subsample of hot Jupiters residing in the the Galactic bulge, from the Extrasolar Planets Encyclopedia. We found that the bulge planets might have lost up to several Earth's atmospheres in mass during Sgr A*'s AGN phase. We also obtained an AGN sample from the Sloan Digital Sky Survey database, with which we estimated possible AGN influence on the galactic time evolution of planetary atmospheres. We found that Earth-like planets might experience mass loss up to 15 times Mars's atmosphere over the period of 50 Myrs as the result of exposure to XUV irradiation emitted the nearby AGNs.

The results of this work have already been presented in a form of a poster at the COST ACTION TD1308 LIFE ORIGINS conference Life on Earth and Beyond: Emergence, Survivability and Impact on the Environment, on the 18th-24th March 2018 in Bertinoro Italy and the XXXth General Assembly of the International Astronomical Union Division F: Planetary Systems and Bioastronomy, on the 24th-31st August 2018 in Vienna Austria.

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