Heliocentric zoning of the asteroid belt by aluminum-26 heating

Details Heliocentric zoning of the asteroid belt by aluminum-26 heating Heliocentric zoning of the asteroid belt by aluminum-26 heating

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993sci...259..653g&link_type=abstract

Science (ISSN 0036-8075), vol. 259, no. 5095, p. 653-655.

Astronomy and Astrophysics

Astronomy

77

Aluminum 26, Asteroid Belts, Astronomical Spectroscopy, Solar Heating, Solar System Evolution, Ice, Interplanetary Magnetic Fields, Petrology, Planetary Evolution, Protoplanets, Radioactive Decay, Asteroids, Asteroid Belt, Zoning, Aluminum 26, Heating, Solar Effects, Thermal Effects, Radius, Distance, Electrical Effects, Induction, Thermal History, Radionuclides, Hypotheses, Theroretical Studies, Accretion, Timescale, Models, Temperature, Spectrophotometry, Decay, Isotopes, Radioactivity

Scientific paper

The dependence of asteroid spectral class (and inferred composition and thermal history) on heliocentric radius has been held to be the result of heating by a solar energy source, most likely electrical induction, during the formation of the planetary system. Such variations in thermal history can be more simply explained by the presence of different amounts of the radionuclide aluminum-26, whose decay products are observed in meteorites, in planetesimals. These differences occurred naturally as a function of the increasing amount of time required to accrete objects farther from the sun, during which aluminum-26 decayed from its initial concentration in the solar nebula. Both theory and isotopic evidence suggest that increases in accretion time across the asteroid belt are of order several half-lives of aluminum-26, which is sufficient to produce the inferred differences in thermal history.

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