'Primitive' galactic dust in the solar system?

Details 'Primitive' galactic dust in the solar system? 'Primitive' galactic dust in the solar system?

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986icar...67...63s&link_type=abstract

(Colloquium on the Galaxy and the Solar System, Tucson, AZ, Jan. 10-12, 1985) Icarus (ISSN 0019-1035), vol. 67, July 1986, p. 63

Astronomy and Astrophysics

Astrophysics

27

Comets, Cosmic Dust, Interstellar Chemistry, Interstellar Matter, Proton Irradiation, Solar System, Carbon, Organic Materials, Refractory Materials

Scientific paper

The results of experiments with ion-induced evolution of C-rich frozen gas and organic refractory material typical of astrophysical materials present in interstellar space since the collapse and formation of the Galaxy and solar system are described. The trials featured ion beam energies in the keV-MeV range. New materials emerged when the irradiation reached 10 to the 16th/sq cm. Yellowish, fluffy material appearing at proton energies of 1.5 MeV had a density of 0.5 g/cu cm and IR signatures similar to polymers. At fluences of about 10 to the 17th protons/sq cm, an amorphous, carbon-like material evolved with a higher density. The data, considered in conjunction with estimates of the ion fluxes to which comets are exposed, indicate that galactic and solar fast protons penetrate comets to a depth of 100 m. Significant amounts of carbon-like material is built up and remains on grains which have been captured and interpreted as cometary debris. Therefore, it is unlikely that cometary dust retains any physical characteristics of the primal Galaxy and solar system.

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