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Due to its Earth-like minimum mass of 1.27 M$_{\text{E}}$ and its closeproximity to our Solar system, Proxima Centauri b is one of the mostinteresting exoplanets for habitability studies. Its host star, ProximaCentauri, is however a strongly flaring star, which is expected to provide avery hostile environment for potentially habitable planets. We perform ahabitability study of Proxima Centauri b assuming an Earth-like atmosphereunder high stellar particle bombardment, with a focus on spectral transmissionfeatures. We employ our extensive model suite calculating energy spectra ofstellar particles, their journey through the planetary magnetosphere,ionosphere, and atmosphere, ultimately providing planetary climate and spectralcharacteristics, as outlined in Herbst et al. (2019). Our results suggest thattogether with the incident stellar energy flux, high particle influxes can leadto efficient heating of the planet well into temperate climates, by limitingCH$_4$ amounts, which would otherwise run into anti-greenhouse for such planetsaround M-stars. We identify some key spectral features relevant for futurespectral observations: First, NO$_2$ becomes the major absorber in the visible,which greatly impacts the Rayleigh slope. Second, H$_2$O features can be maskedby CH$_4$ (near infra-red) and CO$_2$ (mid to far infra-red), making themnon-detectable in transmission. Third, O$_3$ is destroyed and instead HNO$_3$features become clearly visible in the mid to far infra-red. Lastly, assuming afew percent of CO$_2$ in the atmosphere, CO$_2$ absorption at 5.3 $\mu$mbecomes significant (for flare and non-flare cases), strongly overlapping witha flare related NO feature in Earth's atmosphere.

Proxima Centauri b: A Strong Case for including Cosmic-Ray-induced Chemistry in Atmospheric Biosignature Studies