Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988em%26p...43..123f&link_type=abstract
Earth, Moon, and Planets (ISSN 0167-9295), vol. 43, Nov. 1988, p. 123-130.
Physics
1
Planetary Systems, Protostars, Star Formation, Stellar Mass, Abundance, Interstellar Gas, Milky Way Galaxy, Solar Neighborhood, Supernovae
Scientific paper
Current protostellar theory has determined a lower limit to the mass of a pre-stellar gas cloud fragment of ≡0.01 M_sun;. This suggests that isolated interstellar bodies in the mass range ≡10-7 - 10-2M_sun; must have originated within a planetary system. Two possible mechanisms whereby planets are lost from their parental systems to interstellar space are discussed and the abundance and distribution of such "unbound planets" within the Galaxy is examined. It is found that, except within the central regions of the Galaxy, unbound planets are expected to be scarce. The faint possibility that the hypothetical "Planet X" might be of extra-solar origin is also discussed.
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