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Near-infrared spectra of liquid/solid acetylene under Titan relevant conditions and implications for Cassini/VIMS detections
- Source :
- Icarus, Icarus, Elsevier, 2016, 270, pp.429-434. ⟨10.1016/j.icarus.2015.11.002⟩
- Publication Year :
- 2016
- Publisher :
- HAL CCSD, 2016.
-
Abstract
- Acetylene is thought to be abundant on Titan according to most photochemical models. While detected in the atmosphere, its likely presence at the surface still lacks physical evidence. It is thought that solid acetylene could be a major component of Titan’s lakes shorelines and dry lakebed, detected as the 5 μm-bright deposits with the Cassini/VIMS instrument. Acetylene could also be present under its liquid form as dissolved solids in Titan’s methane–ethane lakes, as emphasized by thermodynamics studies. This paper is devoted to the near-infrared spectroscopy study of acetylene under solid and liquid phases between 1 and 2.2 μm, synthesized in a Titan simulation chamber that is able to reproduce extreme temperature conditions. From experiments, we observed a ∼10% albedo increase between liquid acetylene at 193–188 K and solid acetylene at 93 K. Using the NIR spectroscopy technique we successfully calculated the reflectivity ratio of solid/liquid acetylene as 1.13. The second difference we observed between liquid and solid acetylene is a shift in the major absorption band detected at 1.54 μm, the shift of ∼0.01 μm occurring toward higher wavelength. In order to assess the detectability of acetylene on Titan using the Cassini/VIMS instrument, we adapted our spectra to the VIMS spectral resolution. The spectral band at 1.55 μm and a negative slope at 2.0 μm falls in the Cassini/VIMS atmospheric windows over several VIMS infrared spectels, thus Cassini/VIMS should be able to detect acetylene.
- Subjects :
- Materials science
010504 meteorology & atmospheric sciences
Infrared
Near-infrared spectroscopy
Analytical chemistry
Infrared spectroscopy
Astronomy and Astrophysics
01 natural sciences
Astrobiology
chemistry.chemical_compound
symbols.namesake
Acetylene
chemistry
13. Climate action
Space and Planetary Science
Absorption band
[SDU]Sciences of the Universe [physics]
0103 physical sciences
symbols
Spectral resolution
Titan (rocket family)
Spectroscopy
010303 astronomy & astrophysics
ComputingMilieux_MISCELLANEOUS
0105 earth and related environmental sciences
Subjects
Details
- Language :
- English
- ISSN :
- 00191035 and 10902643
- Database :
- OpenAIRE
- Journal :
- Icarus, Icarus, Elsevier, 2016, 270, pp.429-434. ⟨10.1016/j.icarus.2015.11.002⟩
- Accession number :
- edsair.doi.dedup.....540632d64010480843eecdc4d60930a3