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Infrared emission by organic grains in the coma of comet Halley

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Abstract

Spacecraft1 and ground-based2–5 observations of comet Halley in the near-infrared reveal a triple-peaked emission feature near 3.4 µm, characteristic of C–H stretching in hydrocarbons (–CH3 and –CH2– alkanes). Here we discuss transmission spectra of organic residues produced by laboratory irradiation of candidate cometary ices, which serve as the basis for a model of emitting cometary dust. The laboratory synthesis of solid organic residue from irradiated low-occupancy methane ice clathrate simulates the radiation processing experienced by comet Halley. The transmission spectrum of this residue, convolved with a simple two-component thermal emission model based on the spacecraft-determined dust distribution in the Halley coma, fits the 3.4 µm feature, provides optical depths in excellent agreement with those observationally determined, and accounts for the absence of features at longer wavelengths (despite their presence in transmission spectra of typical ice irradiation residues).

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References

  1. 1. Combes, M. et al. Adv. Space Sci (in the press). 2. Wickramasinghe, D. T. and Alien, D. A. Nature 323, 44-46 (1986). 3. Danks, A. et al. in 20th Eslab Symposium on the Exploration of Halley's Comet 3 103-106 (ESA SP-250, 1986). 4. Baas, F., Geballe, T. R. & Walther, D. M. Astrophys. J. Lett. 311, L97-L101 (1986). 5. Knacke, R. F., Brooke, T. Y. & Joyce, R. R. Astrophys. J. Lett. 310, L49-L54 (1986). 6. Crovisier, J. & Encrenaz, Th. Astr. Astrophys. 126, 170-182 (1983). 7. Kissel, J. et al. Nature 321, 280-282 (1986). 8. Kissel, J. & Krueger, F. R. Nature 326, 755-760 (1987). 9. Sekanina, Z. in 20th Eslab Symposium on the Exploration of H alley's Comet 2, 131-143 (ESA SP-250, 1986). 10. Delsemme, A. H. & Swings, P. Ann. Astrophys. 15, 1-6 (1952). 11. Calcagno, L., Foti, G., Torrisi, L. & Strazzulla, G. Icarus 63, 31-38 (1985). 12. Davis, D. R., Libby, W. F. & Meinschein, W. G. J. Chem. Phys. 45, 4481-4492 (1966). 13. Khare, B. N., Murray, B., Sagan, C. & Arakawa, E. T. Icarus (in the press). 14. Thompson, W. R., Murray, B., Khare, B. N. & Sagan, C. J. geophys. Res. (in the press). 15. Khare, B. N., Sagan, C., Thompson, W. R., Arakawa, E. T. & Votaw, P. J. geophys. Res. in the press). 16. Sagan, C., Khare, B. N. & Lewis, J. S. in Saturn (eds Gehrels, T. & Matthews, M. S.), 788-807 (University of Arizona Press, 1984). 17. Chyba, C. & Sagan, C. in Proceedings of the International Workshop on Laboratory Simulation of Organic Cometary Material (eds Kissel, J. & Strazzulla, G.) 50-57 (University of Catania, 1987); Cornell CRSR Preprint No. 877 (1987). 18. Draganic, I. G., Draganic, Z. D. & Vujosevic, S. Icarus 60, 464-475 (1984). 19. Johnson, R. E., Cooper, J. F., Lanzerotti, L. J. & Strazzulla, G. Astr. Astrophys. (in the press). 20. Foti, G., Calcagno, L., Sheng, K. L. & Strazzulla, G. Nature 310, 126-128 (1984). 21. Moore, M. H., Donn, B., Khanna, R. & A'Hearn, M. F. Icarus 54, 388-405 (1983). 22. Biermann, L., Giguere, P. T. & Huebner, W. F. Astr. Astrophys. 108, 221-226 (1982). 23. Hanner, M. S. in Cometary Exploration II (ed. Gombosi, T. I.) 1-22 (Hungarian Academy of Science, Budapest, 1982). 24. Greenberg, J. M. in Cosmic Dust (ed. McDonnell, J. A.) 187-294 (Wiley, New York, 1978). 25. McDonnell, J. A. M. et al. 20th Eslab Symposium on the Exploration of Halley's Comet 2, 25-38 (ESA SP-250, 1986). 26. Divine, N. et al. The Comet Halley Dust and Gas Environment, JPL D-2823 (1985). 27. Gehrz, R. D. & Ney, E. P. 20th Eslab Symposium on the Exploration of Halley's Comet 2, 101-105 (ESA SP-250, 1986). 28. Bregman, J. D. et al. Astr. Astrophys. (in the press). 29. Khare, B. N. et al. Icarus 60, 127-137 (1984). 30. Hanner, M. S. Adv. Space Res. 5, 325-334 (1986). 31. Lamy, P. & Perrin, J. M. Icarus (in the press). 32. Herter, T., Gull, G. E. & Campins, H. 20th Eslab Symposium on the Exploration of Halley's Comet 2, 117-120 (ESA SP-250, 1986). 33. Alien, D. A. & Wickramasinghe, D. T. Nature 329, 615-616 (1987).

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  1. Laboratory for Planetary Studies, Cornell University, Ithaca, New York, 14853–6801, USA

    Christopher Chyba & Carl Sagan

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  1. Christopher Chyba
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  2. Carl Sagan
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Chyba, C., Sagan, C. Infrared emission by organic grains in the coma of comet Halley. Nature 330, 350–353 (1987). https://doi.org/10.1038/330350a0

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  • DOI: https://doi.org/10.1038/330350a0

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