Purple Bacteria as Infrared Biosignatures on Red-Dwarf Exoplanets

To the point

Led by Lígia Fonseca Coelho with Lisa Kaltenegger and including William Philpot and Stephen Zinder, the team says purple bacteria could power photosynthesis on many Earth-like exoplanets around red dwarfs, producing infrared biosignatures future telescopes could detect and guiding a database to distinguish life from minerals.

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In Search for Alien Life, Purple May be the New Green
arizona.edu

In Search for Alien Life, Purple May be the New Green

Instead of green, many bacteria on Earth contain purple pigments, and purple worlds on which they are dominant would produce a distinctive “light fingerprint” detectable by next-generation ground- and space-based telescopes.