Are Low-Albedo Asteroids Thermally Metamorphosed?

Details Are Low-Albedo Asteroids Thermally Metamorphosed? Are Low-Albedo Asteroids Thermally Metamorphosed?

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..124..483v&link_type=abstract

Icarus, Volume 124, Issue 2, pp. 483-489.

Computer Science

16

Scientific paper

Arguments have been made that the surfaces of the C-, G-, B-, and F-class asteroids have been thermally metamorphosed at temperatures ranging from 600 to 1000 degC (Hiroi, T., C. M. Pieters, M. E. Zolensky, and M. E. Lipschutz 1993. Science 261, 1016-1018). These arguments are based on similarities between the strength of a UV/blue absorption feature and the general spectral shape from 1.0 to 2.5 μm in spectra of these asteroids and spectra of three CI/CM carbonaceous chondrites showing compositional signs of thermal metamorphism. Many of these asteroids exhibit a spectral feature centered at 0.7 μm associated with the presence of iron-bearing phyllosilicates, products of an aqueous alteration process. This feature vanishes in the spectra of CM2 carbonaceous chondrite samples heated to temperatures >=400 degC, contradicting the conclusion that the surface material of these asteroids was last heated to higher temperatures. The presence and distribution of this spectral feature among the low-albedo asteroids places some constraints on the thermal environment in the early Solar System. A weak correlation of the presence of this feature with asteroid diameter suggests that the asteroid heating that occurred shortly after their formation was due to a mechanism having a dependency on both heliocentric distance and size.

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