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The Search for Interstellar Components in Interplanetary Dust Particles

Published online by Cambridge University Press:  27 February 2018

John Bradley  and
Trevor Ireland
John Bradley
Affiliation:
MVA Inc., 5500/200 Oakbrook Parkway, Norcross, GA 30093, USA
Trevor Ireland
Affiliation:
Research School of Earth Sciences, Australian National University, Canberra, ACT, Australia

Abstract

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Amorphous silicate grains known as GEMS have been found in chondritic porous interplanetary dust particles (IDPs) from comets. GEMS are composed of nanometer-sized FeNi metal and Fe-rich sulfide crystals embedded in silicate glass. The properties of GEMS appear to have been shaped primarily by exposure to ionizing radiation and, since the irradiation occurred prior to accretion of the cometary IDPs, GEMS may have formed either in the solar nebula or presolar interstellar environments. The sizes, shapes, structures, and compositions of GEMS correspond to those of interstellar “amorphous silicate” grains. Nanometer-sized superparamagnetic metal inclusions dispersed throughout GEMS provide a logical explanation for alignment of interstellar silicate grains in the galactic magnetic field. Irrespective of their origins, GEMS are an important class of submicrometersized chondritic objects. If they were formed in the solar nebula, then they are among the oldest known solar nebula solids. If they are presolar, then they are probably examples of the “amorphous silicate” grains which are ubiquitous throughout the interstellar medium.

Type
VIII. Chemistry of the Interplanetary Dust
Information
International Astronomical Union Colloquium , Volume 150: Physics, Chemistry and Dynamics of Interplanetary Dust , 1996 , pp. 275 - 282
Copyright
Copyright © Astronomical Society of the Pacific 1996

References

Anders, E. and Ebihara, M. (1982) GCA 46, 2363.Google Scholar
Bradley, J. P. (1994a) GCA 58, 2123.Google Scholar
Bradley, J. P. (1994b) Science 265, 925 Google Scholar
Bradley, J. P. et al. (1988) in Meteorites and the Early Solar System Kerridge, J. F. and Matthews, M. S., Eds. (Univ Arizona Press) p 861 Google Scholar
Bradley, J. P. et al. (1996) LPSC 27, in press.Google Scholar
Brownlee, D E. (1994) in Analysis of Interplanetary Dust. Zolensky, M. E., Wilson, T. L., Rietmeijer, F. J. M., and Flynn, G. J., Eds. (AIP Conf. Proc 310) p5.Google Scholar
Brownlee, D. E. (1996) personal communication.Google Scholar
Brownlee, D. E. et al. (1994) LPSC 25, 185.Google Scholar
Brownlee, D. E. et al., (1996) LPSC 27, in press.Google Scholar
Esat, T M. et al. (1979) Science 206, 190.Google Scholar
Flynn, G. J. (1994) Nature 371, 287 Google Scholar
Flynn, G. J. et al. (1995) Meteoritics 30, 505.Google Scholar
Goodman, A. A. and Whittet, D C. B. (1995) Ap. J. 455, L181 Google Scholar
Greenberg, J. M. (1982) in Comets, Wilkening, L. L., Ed. (Univ. Arizona Press, Tucson 1982) p 131 CrossRefGoogle Scholar
Hanner, M. S. (1994) in Analysis of Interplanetary Dust. Zolensky, M. E., Wilson, T. L., Rietmeijer, F. J. M., and Flynn, G. J., Eds. (AIP Conf. Proc.310) p23 Google Scholar
Johnson, R. E. (1985) in Ices in the Solar System. Klinger, J. et al. Eds. (Riedel Publishing Company), p. 337 Google Scholar
Jones, R. V. and Spitzer, L. (1967) Ap. J. 147, 943 Google Scholar
Klöck, W., and Stadermann, F. J. (1994) in Analysis of Interplanetary Dust. Zolensky, M. E., Wilson, T. L., Rietmeijer, F. J. M., and Flynn, G. J., Eds. (AIP Conf. Proc. 310) p 51 Google Scholar
Love, S. J. et al. (1993) LPSC 24, 901.Google Scholar
Love, S. J and Brownlee, D. E. (1994) Meteoritics 29, 69 Google Scholar
Martin, P G. (1995) Ap. J 445, L63 Google Scholar
Mathis, J. S. (1993) Rep. Prog. Phys. 56, 605.Google Scholar
McKecgan, K. D. et al. (1985) Geochim. Cosmochim. Acta 49, 1971 Google Scholar
Messenger, S. et al. (1995) Meteoritics, 30, 546.Google Scholar
Ney, E. P. (1977) Science 195, 541 CrossRefGoogle Scholar
Nier, A. O. and Schlutter, D. J. (1993) Meteoritics 28, 675.Google Scholar
Nuth, J. A. (1988) in Meteorites and the Early Solar System. Kerridge, J. and Matthews, M. S., Eds. (Univ Arizona Press, Tucson) pp 457–497 Google Scholar
Ott, U. (1993) Nature 364, 25 Google Scholar
Schramm, L. S. et al. (1989) Meteoritics 24, 99 Google Scholar
Stadermann, F J. et al. (1989) Meteoritics 24, 327 Google Scholar
Thomas, K. L. et al. (1995) GCA 59, 2797 Google Scholar
Walker, R. M. (1994) in Analysis of Interplanetary Dust. Zolensky, M. E., Wilson, T. L., Rietmeijer, F. J. M., and Flynn, G. J., Eds. (AIP Conf. Proc. 310) p 203 Google Scholar
Wiedenbeck, M. E. (1984) Adv. Space Res. 4, 15 CrossRefGoogle Scholar
Zolensky, M. E. et al. (1994), “Analysis of Interpanetary Dust” (American Institute of Physics Conference Proceedings, New York, 1994) pp357 Google Scholar