The mean energy transfer rate to comets in the Oort cloud and implications for cometary origins

Details The mean energy transfer rate to comets in the Oort cloud and implications for cometary origins The mean energy transfer rate to comets in the Oort cloud and implications for cometary origins

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218....1b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Jan. 1, 1986, p. 1-30. SERC-NSF-supported research

Astronomy and Astrophysics

Astronomy

47

Comets, Energy Transfer, Molecular Clouds, Oort Cloud, Solar System, Companion Stars, Energy Spectra, Evolution (Development), Nemesis (Star), Rates (Per Time), Solar Corona, Comets, Oort Cloud, Energy, Transport, Origin, Source, Calculations, Perturbations, Evolution, Time Scale, Comparisons, Parameters, Energy, Procedure, Long-Period Comets, Solar Nebula, Models

Scientific paper

The mean energy transfer rate to comets in the Oort cloud is calculated including both stellar and giant molecular cloud perturbations. For representative values of the parameters the clouds dominate the evolution for semi-major axes a ⪆ 2×104AU, while stars dominate if a ⪉ 2×104AU. The resulting unbinding time-scales and half-lives are calculated and compared with the results of Bahcall et al. and Hut & Tremaine. Taking the stars and clouds together the author estimates the critical semi-major axis a1/2, beyond which the majority of primordial comets are removed during the age of the solar system, is of order 104AU. The implications of this work for the existence of the hypothetical solar companion star Nemesis suggests that in its present form the idea should be rejected. Finally the evolution of the Oort cloud and implications for the origins of comets are considered.

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