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| Titel |
Anomalies in the spectra of planetary ice particles |
| VerfasserIn |
Rafael Escribano, Oscar Gálvez, Belén Maté, Miguel A. Moreno, Víctor J. Herrero, F. Javier Martin-Torres |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250052818
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| Zusammenfassung |
| Ice particles generated in laboratory by vapour deposition at low temperature and pressure allow the simulation of different icy systems in the atmosphere and surface of Solar System bodies, and in astrophysical particles (1-3). The spectroscopic properties of the laboratory particles can be studied with great detail, and the information deduced from them can be applied to interpret astronomical observations. Using IR spectroscopy and mass spectrometry in Temperature Programmed Desorption (TPD) experiments, we have recently studied ices of mixtures of H2O, CO2, CH3OH and CH4 under various conditions of temperature and degree of mixing (3-6). Among other results, we have detected the presence of “distorted” CO2 or CH4, characterized by frequency shifts or symmetry breakdowns in their vibrational spectra. Such anomalous behaviour can provide a key to understanding observations of remote planetary objects, like Pluto, Triton, Makemake, Quoar, Haumea, or other Trans-Neptunian Objects. The state of the art of this problem will be revised at the talk.
References:
1. R. Hodyss, P.V. Johson, J.V. Stern, J.D. Goguen, I. and Kanik, “Photochemistry of methane-water ices”, Icarus 200, 338 (2009).
2. M.P. Bernstein, D.P. Cruikshank, S.A. and Sanford, “Near-infrared laboratory spectra of solid H2O/CO2 and CH3OH/CO2 ice mixtures”, Icarus 179, 527 (2005).
3. O. Gálvez, B. Maté, V.J. Herrero and R. Escribano, “Trapping and adsorption of CO2 in amorphous ice: a FTIR study”, Icarus, 197, 599 (2008).
4. B. Maté, O. Gálvez, V.J. Herrero and R. Escribano, “Infrared spectra and thermodynamic properties of CO2/methanol ices”, Astrophys. J., 690, 486 (200).
5. O. Gálvez, B. Maté, V.J. Herrero and R. Escribano, “Spectroscopic effects in CH4/H2O ices”, Astrophys. J., 703, 2101 (200).
6. V.J. Herrero, O. Gálvez, B. Maté and R. Escribano, “Interaction of CH4 and H2O in ice mixtures”, Phys.Chem.Chem.Phys., 12, 3164 (2010). |
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