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The Drake equation may need new factors based on peculiarities of planets of Sun-like stars

Published online by Cambridge University Press:  26 May 2016

L. V. Ksanfomality
L. V. Ksanfomality*
Affiliation:
Space Research Institute, Moscow, Russia

Abstract

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N = RsfpneflfifcL. This well known Drake equation denoting the number N of civilizations in the Galaxy, includes a factor fp that is the fraction of stars that have planetary systems, and another factor ne that is the mean number of planets suitable for life. The latter is usually understood as the number of planets within the habitable zone. When the Solar system remained a unique object of its kind the sense of fp and ne seemed to be clear. There is now a limited statistic in hand about the features of other planetary systems, permitting a rough estimation of fp and ne (based on the list of 32 star companions, compiled by G. Marcy, 14.02.2000).

Type
Part V: Discovery and study of extrasolar planets - future
Information
Symposium - International Astronomical Union , Volume 202: Planetary Systems in the Universe – Observation, Formation and Evolution , 2004 , pp. 458 - 461
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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