Black Trees Under Two Suns
Jack O’Malley-James of the University of St. Andrews has studied what plants might be like on an Earth-like planet with two or three suns and found that they may appear black or grey. He presented results at the RAS National Astronomy Meeting in Llandudnoon Tuesday 19th April.
Photosynthesis -- converting sunlight into energy -- is the basis for the majority of life on Earth. It is the energy source for plants and, hence, animals higher up the food chain. With multiple light sources, life may have adapted to use all suns, or different forms may develop that choose to use one specific sun. This may be the more likely option for planets on which parts of the surface are illuminated by only one sun for long periods of time.
“If a planet were found in a system with two or more stars, there would potentially be multiple sources of energy available to drive photosynthesis. The temperature of a star determines its color and, hence, the color of light used for photosynthesis. Depending on the colors of their star-light, plants would evolve very differently,”said O’Malley-James.
O’Malley-James is working on a PhD, supervised by Dr. Jane Greaves at the University of St. Andrews, Prof. John Raven of the University of Dundee and Prof. Charles Cockell of The Open University, to assess the potential for photosynthetic life in multi-star systems with different combinations of Sun-like stars and red dwarfs.
“Our simulations suggest that planets in multi-star systems may host exotic forms of the more familiar plants we see on Earth. Plants with dim red dwarf suns for example, may appear black to our eyes,absorbing across the entire visible wavelength range in order to useas much of the available light as possible. They may also be able to use infrared or ultraviolet radiation to drive photosynthesis. For planets orbiting two stars like our own, harmful radiation from intense stellar flares could lead to plants that develop their own UV-blocking sun-screens, or photosynthesizing microorganisms that can move in response to a sudden flare,” said O’Malley-James.