Constraints on cometary origins from isotropy of the microwave background and other measurements

Astronomy and Astrophysics – Astronomy

Scientific paper

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Background Radiation, Comets, Microwave Emission, Solar System, Comet Nuclei, Constraints, Cosmic Background Explorer Satellite, Infrared Astronomy, Mass Distribution

Scientific paper

Results are presented for four ways of limiting the mass of a dense inner core of comets that may surround the planetary system. Deep far-infrared measurements probably provide the most useful constraints, while future measurements with the Cosmic Background Explorer Satellite (COBE) will do even better. Theories of cometary origins which predict a mass of the inner core in excess of ≅100 M_earth should take these observations into account. The possibility of detecting comet clouds around nearby stars is also discussed.

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