Habitable moons around extrasolar giant planets

Darren M. Williams, James F. Kasting, Richard A. Wade

Research output: Contribution to journalArticlepeer-review

155 Scopus citations


Possible planetary objects have now been discovered1-9 orbiting nine different main-sequence stars. These companion objects (some of which might actually be brown dwarfs) all have a mass at least half that of Jupiter, and are therefore unlikely to be hospitable to Earth-like life: jovian planets and brown dwarfs support neither a solid nor a liquid surface near which organisms might dwell. Here we argue that rocky moons orbiting these companions could be habitable if the planet-moon system orbits the parent star within the so-called 'habitable zone', where life-supporting liquid water could be present. The companions to the stars 16 Cygni B and 47 Ursae Majoris might satisfy this criterion. Such a moon would, however, need to be large enough (>0.12 Earth masses to retain a substantial and long-lived atmosphere, and would also need to possess a strong magnetic field in order to prevent its atmosphere from being sputtered away by the constant bombardment of energetic ions from the planer's magnetosphere.

Original languageEnglish (US)
Pages (from-to)234-236
Number of pages3
Issue number6613
StatePublished - Jan 16 1997

All Science Journal Classification (ASJC) codes

  • General


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