Stuttgart 2012 – wissenschaftliches Programm
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EP: Fachverband Extraterrestrische Physik
EP 3: Astrobiologie
EP 3.2: Vortrag
Dienstag, 13. März 2012, 14:30–14:45, V55.02
High-energy galactic cosmic rays in the magnetospheres of terrestrial exoplanets — •Jean-Mathias Grießmeier1, Anja Stadelmann2, Lee Grenfell3, Beate Patzer3, Philip von Paris4,5, and Helmut Lammer6 — 1LPC2E/Université d’Orléans/OSUC/CNRS, Orléans, France — 2Technische Universität Braunschweig, Germany — 3Technische Universität Berlin, Germany — 4Univ. Bordeaux, LAB, UMR 5804, Floirac, France — 5CNRS, LAB, UMR 5804, Floirac, France — 6Space Research Institute, Austrian Academy of Sciences, Graz, Austria
Theoretical arguments indicate that close-in terrestial exoplanets may have weak magnetic fields, especially in the case of planets more massive than Earth (“super-Earths”). Planetary magnetic fields, however, constitute one of the shielding layers which protect the planet against cosmic ray particles. In particular, a weak magnetic field results in a high particle flux to the top of the planetary atmosphere. For the case of cosmic ray protons, we numerically analyze the propagation of the particles through planetary magnetospheres. We evaluate the efficiency of magnetospheric shielding as a function of the particle energy (in the range 64 MeV ≤ E ≤ 500 GeV) and of the planetary magnetic field strength (in the range 0.05 ME ≤ M ≤ 2 ME). We also show the dependence of the penetration energy on the planetary magnetic field strength. Implications of increased particle fluxes are discussed, including the modification of atmospheric chemistry, destruction of atmospheric biomarker molecules, and potential biological implications.