Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Simulating the 3.4-Micron Feature of Titan's Haze

  • Kim, Y.S. (Department of Chemistry, University of Hawaii at Manoa) ;
  • Ennis, C. (Department of Chemistry, University of Hawaii at Manoa) ;
  • Kim, Sang Joon (School of Space Research, Kyung Hee University)
  • Received : 2012.10.03
  • Accepted : 2012.12.08
  • Published : 2013.03.20
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Abstract

Four prominent features of Titan's haze are found within the '3.4-${\mu}m$' absorption to be uniform with recent vertically resolved Cassini/VIMS spectra. These are absorptions at 2998 $cm^{-1}$ (3.34 ${\mu}m$), 2968 $cm^{-1}$ (3.37 ${\mu}m$), 2927 $cm^{-1}$ (3.42 ${\mu}m$), and 2882 $cm^{-1}$ (3.47 ${\mu}m$). A detailed fitting suggests that the 2998 $cm^{-1}$ feature could originate from amorphous acetonitrile ($CH_3CN$) carrying about 25% of integrated optical depth; the remaining features, which account for 75% of the integrated optical depth, could arise from a distinct triplet (C-H stretching) structure of radiolyzed hydrocarbons. An additional feature was possibly evidenced at altitudes higher than 300 km and attributable to 'polymer-capped' methane ($CH_4$), significantly constraining the chemical composition of organic haze layers under Titan's active radiation field.

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References

  1. Bellucci, A. 2008, Ph.D. thesis. Universite Pierre et Marie Curie.
  2. Stone, E. C.; Miner, E. D. Science 1981, 212, 159. https://doi.org/10.1126/science.212.4491.159
  3. Khare, B. N.; Sagan, C.; Arakawa, E. T.; Suits, F.; Callcott, T. A.; Williams, M. W. Icarus 1984, 60, 127. https://doi.org/10.1016/0019-1035(84)90142-8
  4. Rannou, P.; Cours, T.; Le Mouélic, S.; Rodriguez, S.; Sotin, C.; Drossart, P.; Brown, R. Icarus 2010, 208, 850. https://doi.org/10.1016/j.icarus.2010.03.016
  5. Vinatier, S.; Rannou, P.; Anderson, C. M.; Bezard, B.; Kok, R. de.; Samuelson, R. E. Icarus 2012, 219, 5. https://doi.org/10.1016/j.icarus.2012.02.009
  6. Coustenis, A.; Schmitt, B.; Khanna, R. K.; Trotta, F. Planet. Space Sci. 1999, 47, 1305. https://doi.org/10.1016/S0032-0633(99)00053-7
  7. Coustenis, A. et al. Icarus 2006, 180, 176. https://doi.org/10.1016/j.icarus.2005.08.007
  8. Griffith, C. A. Nature 1993, 364, 511. https://doi.org/10.1038/364511a0
  9. Kim, S. J.; Geballe, T. R.; Noll, K. S.; Courtin, R. Icarus 2005, 173, 522. https://doi.org/10.1016/j.icarus.2004.09.006
  10. Kwok, S.; Zhang, Y. Nature 2011, 479, 80. https://doi.org/10.1038/nature10542
  11. Bellucci, A.; Sicardy, B.; Drossart, P.; Rannou, P.; Nicholson, P. D.; Hedman, M.; Baines, K. H.; Burrati, B. Icarus 2009, 201, 198. https://doi.org/10.1016/j.icarus.2008.12.024
  12. Kim, S. J.; Jung, A.; Sim, C. K.; Courtin, R.; Bellucci, A.; Sicardy, B.; Song, I. O.; Minh, Y. C. Planet. Space Sci. 2011, 59, 699. https://doi.org/10.1016/j.pss.2011.02.002
  13. Kaiser, R. I. et al. Faraday Discuss. 2010, 147, 429. https://doi.org/10.1039/c003599h
  14. Moore, M. H.; Ferrante, R. F.; Moore, W. J.; Hudson, R. Astrophys. J. Supp. 2010, 191, 96. https://doi.org/10.1088/0067-0049/191/1/96
  15. Coates, A. J. Phil. Trans. R. Soc. A 2009, 367, 773. https://doi.org/10.1098/rsta.2008.0248
  16. Krasnopolsky, V. A. Icarus 2009, 201, 226. https://doi.org/10.1016/j.icarus.2008.12.038
  17. Molina-Cuberos, G. J.; Lopez-Moreno, J. J.; Rodrigo, R.; Lara, L. M.; O'Brian, K. Planet. Space Sci. 1999, 47, 1347. https://doi.org/10.1016/S0032-0633(99)00056-2
  18. Whitten, R. C.; Borucki, W. J.; Tripathi, S. J. Geophys. Res. 2007, 112, E04001. https://doi.org/10.1029/2006JE002788
  19. Kim, Y. S.; Bennett, C. J.; Chen, L.-H.; O'Brian, K.; Kaiser, R. I. Astrophys. J. 2010, 711, 744. https://doi.org/10.1088/0004-637X/711/2/744
  20. Quirico, E. et al. Icarus 2008, 198, 218. https://doi.org/10.1016/j.icarus.2008.07.012
  21. Bohn, R. B.; Sandford, S. A.; Allamandola, L. J.; Cruikshank, D. P. Icarus 1994, 111, 151. https://doi.org/10.1006/icar.1994.1138
  22. Bennett, C. J.; Jamieson, C.; Mebel, A. M.; Kaiser, R. I. Phys. Chem. Chem. Phys. 2004, 6, 735. https://doi.org/10.1039/b315626p
  23. Zhou, L.; Zheng, W.; Kaiser, R. I.; Landera, A.; Mebel, A. M.; Liang, M.-C.; Yung, Y. L. Astrophys. J. 2010, 718, 1243. https://doi.org/10.1088/0004-637X/718/2/1243
  24. Russo, N. D.; Khanna, R. K. Icarus 1996, 123, 366. https://doi.org/10.1006/icar.1996.0165
  25. Bauerecker, S.; Dartois, E. Icarus 2009, 199, 564. https://doi.org/10.1016/j.icarus.2008.09.014
  26. Kaiser, R. I.; Roessler, K. Astrophys. J. 1998, 503, 959. https://doi.org/10.1086/306001
  27. d'Hendecourt, L. B.; Allamandola, L. J. Astron. Astrophys. Supp. 1986, 64, 453.