Purple Biosignatures: Reflectance Spectra of Non-Chlorophyll Bacteria and Implications for Exoplanet Life

To the point

Researchers test purple bacteria that power photosynthesis without chlorophyll by analyzing how they reflect light to search for surface biosignatures on exoplanets, noting their pigments can look brown or reddish and could be informative on cooler, infrared-rich worlds around red stars.

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Seeing Purple in the Search for Alien Life

Researchers measure and model the reflectance spectra of purple bacteria (including purple sulfur and purple non-sulfur types) across 400–2500 nm under fresh and dry conditions to assess purple pigments as potential surface biosignatures for life on exoplanets, propose they could be relevant on cooler planets around red stars with infrared light, and compile a spectral library from over 20 purple-bacteria cultures plus two green cyanobacteria to frame expectations for distant-world observations, while noting uncertainty about life elsewhere.