Photosynthetic potential of planets in 3 : 2 spin-orbit resonances

S. P. Brown, A. J. Mead, D. H. Forgan (Lead / Corresponding author), J. A. Raven, C. S. Cockell

    Research output: Contribution to journalArticlepeer-review

    11 Citations (Scopus)


    Photosynthetic life requires sufficient photosynthetically active radiation to metabolize. On Earth, plant behaviour, physiology and metabolism are sculpted around the night-day cycle by an endogenous biological circadian clock. The evolution of life was influenced by the Earth-Sun orbital dynamic, which generates the photo-environment incident on the planetary surface. In this work, the unusual photo-environment of an Earth-like planet (ELP) in 3 : 2 spin-orbit resonance is explored. Photo-environments on the ELP are longitudinally differentiated, in addition to differentiations related to latitude and depth (for aquatic organisms) which are familiar on Earth. The light environment on such a planet could be compatible with Earth's photosynthetic life although the threat of atmospheric freeze-out and prolonged periods of darkness would present significant challenges. We emphasize the relationship between the evolution of life on a planetary body with its orbital dynamics.
    Original languageEnglish
    Pages (from-to)279-289
    Number of pages11
    JournalInternational Journal of Astrobiology
    Issue number4
    Early online date6 May 2014
    Publication statusPublished - Oct 2014


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