Origins of life and evolution of the biosphere

, Volume 27, Issue 4, pp 413–420 | Cite as

ultraviolet radiation from F and K stars and implications for planetary habitability

  • James F. Kasting
  • Douglas C. B. Whittet
  • William R. Sheldon


Now that extrasolar planets have been found, it is timely to ask whether some of them might be suitable for life. Climatic constraints on planetary habitability indicate that a reasonably wide habitable zone exists around main sequence stars with spectral types in the early-F to mid-K range. However, it has not been demonstrated that planets orbiting such stars would be habitable when biologically-damaging energetic radiation is also considered. The large amounts of UV radiation emitted by early-type stars have been suggested to pose a problem for evolving life in their vicinity. But one might also argue that the real problem lies with late-type stars, which emit proportionally less radiation at the short wavelengths (λ < 200 nm) required to split O2 and initiate ozone formation. We show here that neither of these concerns is necessarily fatal to the evolution of advanced life: Earth-like planets orbiting F and K stars may well receive less harmful UV radiation at their surfaces than does the Earth itself.


Ozone Geochemistry Short Wavelength Ultraviolet Radiation Real Problem 
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  1. Angel, J. R. P. and Woolf, N. J.: 1996, Scientific. Amer. (April), 60–66.Google Scholar
  2. DeMore, W. B., Golden, D. M., Hampson, R. F., Kurylo, M. J., Howard, C. J., Ravishankara, A. R., Kolb, C. E. and Molina, M. J.: 1992, Chemical Kinetics and Photochemical Data for Use in Stratospheric Modeling, JPL Publication 92–20.Google Scholar
  3. Dragon, J. N. and Mutschlecner, J. P.: 1980, Ap. J. 239, 1045.Google Scholar
  4. Heck, A., Egret, D. and Jasckek, M.: 1984, IUE Low-dispersion Spectral Reference Atlas, Part 1: Normal Stars, ESA publication SP-1052.Google Scholar
  5. Kasting, J. F.: 1987, Precambrian Res. 34, 205–229.Google Scholar
  6. Kasting, J. F. and Donahue, T. M.: 1980, J. Geophys. Res. 85, 3255–3263.Google Scholar
  7. Kasting, J. F., Holland, H. D. and Pinto, J. P.: 1985, J. Geophys. Res. 90, 10–497–10–510.Google Scholar
  8. Kasting, J. F., Whitmire, D. P. and Reynolds, R. T.: 1993, Icarus 101, 108–128.Google Scholar
  9. Laskar, J., Joutel, F. and Robutel, P.: 1993, Nature 361, 615–617.Google Scholar
  10. Leger, A., Pirre, M. and Marceau, F. J.: 1993, Astron. Astrophys. 277, 309–313.Google Scholar
  11. Levine, J. S., Hays, P. B. and Walker, J. C. G.: 1979, Icarus 39, 295–309.Google Scholar
  12. Lissauer, J. J.: 1995, Icarus 114, 217–236.Google Scholar
  13. Marcy, G. W. and Butler, R. P.: 1996, Bull. Am. Astron. Soc., (in press).Google Scholar
  14. Margulis, L., Walker, J. C. G. and Rambler, M. B.: 1976, Nature 264, 620–624.Google Scholar
  15. Mayor, M. and Queloz, D.: 1995, Nature 378, 355–359.Google Scholar
  16. McClatchey, R. A., Fenn, R.W., Selby, J. E. A, Volz, F. E. and Garing, J. S.: 1971, Optical properties of the atmosphere, Tech Rept. AFCRL 71–0279, Air Force Cambridge Res. Lab., Bedford, Mass.Google Scholar
  17. Rambler, M. and Margulis, L.: 1980, Science 210, 638–640.Google Scholar
  18. Sheldon, W. R.: 1995, IUGG XXI General Assembly, Abstracts, p. A15.Google Scholar
  19. Shull, M., Stern, A. and Thronson, H.: 1996, Search for Extrasolar Terrestrial Planets: Techniques and Technology, conference proceedings, Space Science Reviews, (in press).Google Scholar
  20. Wetherill, G. W.: 1994, in Burke, B. F., Rahe, J. H. and Toetrger, E. E. (eds.), Planetary Systems: Formation, Evolution, and Detection, Kluwer Academic Publishers, Dordrecht, pp. 23–32.Google Scholar
  21. Williams, D. M., Kasting, J. F. and Wade, R. A.: 1996, Nature 385, 234–236.Google Scholar
  22. WMO: 1994, Scientific Assessment of Ozone Depletion: 1994, World Meteorological Organization, Geneva, Switzerland.Google Scholar

Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • James F. Kasting
    • 1
  • Douglas C. B. Whittet
    • 2
  • William R. Sheldon
    • 3
  1. 1.Department of GeosciencesThe Pennsylvania State UniversityUniversity ParkU.S.A
  2. 2.Department of Physics, Applied Physics and AstronomyRensselaer Polytechnic InstituteTroyU.S.A
  3. 3.Physics DepartmentUniversity of HoustonHoustonU.S.A

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