RAS Press Release: Could Black Trees Blossom in a World With Two Suns?
April 2011: A sky with two suns is a favourite image for science fiction films, but how would a binary star system affect life evolving on an orbiting planet?
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 will be presenting results at the RAS
National Astronomy Meeting in Llandudno on 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 colour and, hence, the colour of light
used for photosynthesis. Depending on the colours of their star-light, plants would evolve very differently,” said O’Malley James.
O’Malley-James is working on a PhD (funded by the STFC Aurora scheme) supervised by Dr Jane Greaves at the University of St Andrews, Prof John Raven (University of Dundee) and Prof Charles Cockell (The Open University) to assess
the potential for photosynthetic life in multi-star systems with different combinations of Sun-like stars and red dwarfs. Sun-like stars are known to host exoplanets and red dwarfs are the most common type of star in our Galaxy,
often found in multi-star systems, and old and stable enough for life to have evolved. Over 50% of Sun-like stars and 25% of red dwarfs are found in multi-star systems. In the team’s simulations, the Earth-like planets either
orbit two stars close together or orbit one of two widely separated stars. The team has also looked at combinations of these scenarios, with two close stars and one more distant star.
“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 use as 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 photosynthesising microorganisms that can move in response to a sudden flare,” said O’Malley-James.