Hostname: page-component-78c5997874-t5tsf Total loading time: 0 Render date: 2024-11-03T08:22:39.220Z Has data issue: false hasContentIssue false

Solid-state production of complex organic molecules: H-atom addition versus UV irradiation

Published online by Cambridge University Press:  04 September 2018

K.-J. Chuang*
Affiliation:
Sackler Laboratory, Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands email: [email protected]
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Complex organic molecules (COMs) have been observed in comets, hot cores and cold dense regions of the interstellar medium. It is generally accepted that these COMs form on icy dust grain through the recombination reaction of radicals triggered by either energetic UV-photon or non-energetic H-atom addition processing. In this work, we present for the first time laboratory studies that allow for quantitative comparison of hydrogenation and UV-induced reactions as well as their cumulative effect in astronomically relevant CO:CH3OH=4:1 ice analogues. The formation of glycolaldehyde (GA) and ethylene glycol (EG) is confirmed in pure hydrogenation experiments at 14 K, except methyl formate (MF), which is only clearly observed in photolysis. The fractions for MF:GA:EG are 0 : (0.2-0.4) : (0.8-0.6) for pure hydrogenation, and 0.2 : 0.3 : 0.5 for UV involving experiments and can offer a diagnostic tool to derive the chemical origin of these species. The GA/EG ratios in the laboratory (0.3-1.5) compare well with observations toward different objects.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2018 

References

Biver, N., Bockelée-Morvan, D., Debout, V., Crovisier, J., Boissier, J., Lis, D. C., Dello Russo, N., Moreno, R., Colom, P., Paubert, G., Vervack, R., & Weaver, H. A., 2003, ARAA, 566, L5Google Scholar
Chuang, K.-J., Fedoseev, G., Ioppolo, S., van Dishoeck, E. F., & Linnartz, H., 2016, MNRAS, 467, 2552Google Scholar
Chuang, K.-J., Fedoseev, G., Qasim, D., Ioppolo, S., van Dishoeck, E. F., & Linnartz, H., 2017, MNRAS, 540, L49Google Scholar
Coutens, A., Persson, M. V., Jørgensen, J. K., Wampfler, S. F., & Lykke, J. M., 2015, ARAA, 576, 5Google Scholar
Crovisier, J., Bockelée-Morvan, D., Biver, N., Colom, P., Despois, D., & Lis, D. C., 2004, ARAA, 418, L35Google Scholar
Fedoseev, G., Cuppen, H. M., Ioppolo, S., Lamberts, T., & Linnartz, H., 2015, MNRAS, 448, 1288Google Scholar
Goesmann, F., Rosenbauer, H., Bredehöft, J. H., Cabane, M., Ehrenfreund, P., Gautier, T., Giri, C., Krüger, H., Le Roy, L., MacDermott, A. J., McKenna-Lawlor, S., Meierhenrich, U. J., Caro, G. M.M., Raulin, F., Roll, R., Steele, A., Steininger, H., Sternberg, R., Szopa, C., Thiemann, W., & Ulamec, S., 2005, Science, 349, 2Google Scholar
Herbst, H. & van Dishoeck, E. F., 2009, Annu. Rev. Astron. Astrophys, 47, 427Google Scholar
Ioppolo, S., Fedoseev, G., Lamberts, T., Romanzin, C., & Linnartz, H., 2013, Rev. Sci. Instrum., 84, 073112Google Scholar
Jørgensen, J. K., Favre, C., Bisschop, S. E., Bourke, T. L., van Dishoeck, E. F., & Schmalzl, M., 2012, ApJ (Letter), 757, L4Google Scholar
Jørgensen, J. K., van der Wiel, M. H.D., Coutens, A., Lykke, J. M., Müller, H. S.P., van Dishoeck, E. F., Calcutt, H., Bjerkeli, P., Bourke, T. L., Drozdovskaya, M. N., Favre, C., Fayolle, E. C., Garrod, R. T., Jacobsen, S. K., Öberg, K. I., Persson, M. V., & Wampfler, S. F., 2016, ARAA, 595, 117Google Scholar
Maity, S., Kaiser, R. I., & Jones, B. M., 2015, Phys. Chem. Chem. Phys., 17, 3081Google Scholar
Moore, M. H., & Hudson, R. L., 2005, Proceedings of the International Astronomical Union, 1, 247Google Scholar
Öberg, K. I., Garrod, R. T., van Dishoeck, E. F., & Linnartz, H., 2009, ARAA, 504, 891Google Scholar
Öberg, K. I., 2016, Chemical Reviews, 116, 9631Google Scholar
Le Roy, L., Altwegg, K., Balsiger, H., Berthelier, J.-J., Bieler, A., Briois, C., Calmonte, U., Combi, M. R., De Keyser, J., Dhooghe, F., Fiethe, B., Fuselier, S. A., Gasc, S., Gombosi, T. I., Hässig, M., Jäckel, A., Rubin, M., & Tzou, C.-Y., 2015, ARAA, 583, 1Google Scholar
Taquet, V., López-Sepulcre, A., Ceccarelli, C., Neri, R., Kahane, C., & Charnley, S. B., 2015, ApJ, 804, 81Google Scholar