Biology
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..746g&link_type=abstract
European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht
Biology
Scientific paper
Our model predicts that biomarkers from planets orbiting in the Habitable Zone (HZ) of M-Dwarf stars with Earthlike atmospheres (hereafter "M-star worlds") may survive strong fluxes from Galactic Cosmic Rays (GCRs). These calculations included the effects of (albeit weakened) magnetospheric shielding. Our result refers to the effect of cosmic rays producing nitrogen oxides, NOx(=NO+NO2) in earthlike atmospheres which perturb the atmospheric chemistry hence remove ozone. Ozone on the M-star world is resilient to GCR-induced NOx because high methane levels favour the ozoneproducing "smog" mechanism, which is catalysed by NOx as discussed by Grenfell et al. (2007) (Astrobiology Special Issue on M-stars). We have also performed an initial estimate of stellar cosmic ray (SCR) fluxes but these are currently upper estimate fluxes, based on our own Sun, assuming a completely unmagnetised planet scaled to 0.2 AU i.e. in the HZ. SCR results imply that up to 98
Grenfell John Lee
Griessmeier Jean-Mathias
Hedelt Pascal
Paris von Ph.
Patzer Beate
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