VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations
Visual-to-infrared (VIS-IR) remote sensing observations of different classes of outer solar system objects indicate the presence of water ice and organics. Here, we present laboratory reflectance spectra in the 0.5–4.2 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML&quo...
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oai:doaj.org-article:cd84370b5d724baf926bf846bda5bf2b2021-11-25T18:26:24ZVIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations10.3390/min111112222075-163Xhttps://doaj.org/article/cd84370b5d724baf926bf846bda5bf2b2021-11-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1222https://doaj.org/toc/2075-163XVisual-to-infrared (VIS-IR) remote sensing observations of different classes of outer solar system objects indicate the presence of water ice and organics. Here, we present laboratory reflectance spectra in the 0.5–4.2 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m spectral range of binary particulate mixtures of water ice, organics analogue (kerite), and an opaque iron sulphide phase (pyrrhotite) to investigate the spectral effects of varying mixing ratios, endmember grain size, and mixing modality. The laboratory spectra are also compared to different implementations of the Hapke reflectance model (Hapke, 2012). We find that minor amounts (≲1 wt%) of kerite (investigated grain sizes of 45–63 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m and <25 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m) can remain undetected when mixed in coarse-grained (67 ± 31 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m) water ice, suggesting that organics similar to meteoritic insoluble organic matter (IOM) might be characterized by larger detectability thresholds. Additionally, our measurements indicate that the VIS absolute reflectance of water ice-containing mixtures is not necessarily monotonically linked to water ice abundance. The latter is better constrained by spectral indicators such as the band depths of water ice VIS-IR diagnostic absorptions and spectral slopes. Simulation of laboratory spectra of intimate mixtures with a semi-empirical formulation of the Hapke model suggests that simplistic assumptions on the endmember grain size distribution and shape may lead to estimated mixing ratios considerably offset from the nominal values. Finally, laboratory spectra of water ice grains with fine-grained pyrrhotite inclusions (intraparticle mixture) have been positively compared with a modified version of the Hapke model from Lucey and Riner (2011).Mauro CiarnielloLyuba V. MorozOlivier PochVassilissa VinogradoffPierre BeckBatiste RousseauIstiqomah IstiqomahRobin SultanaAndrea RaponiGianrico FilacchioneDavid KappelAntoine PommerolStefan E. SchröderCedric PilorgetEric QuiricoVito MennellaBernard SchmittMDPI AGarticlewater iceorganicsVIS-IR spectroscopyspectral modellingsmall bodiesMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1222, p 1222 (2021) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
water ice organics VIS-IR spectroscopy spectral modelling small bodies Mineralogy QE351-399.2 |
| spellingShingle |
water ice organics VIS-IR spectroscopy spectral modelling small bodies Mineralogy QE351-399.2 Mauro Ciarniello Lyuba V. Moroz Olivier Poch Vassilissa Vinogradoff Pierre Beck Batiste Rousseau Istiqomah Istiqomah Robin Sultana Andrea Raponi Gianrico Filacchione David Kappel Antoine Pommerol Stefan E. Schröder Cedric Pilorget Eric Quirico Vito Mennella Bernard Schmitt VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| description |
Visual-to-infrared (VIS-IR) remote sensing observations of different classes of outer solar system objects indicate the presence of water ice and organics. Here, we present laboratory reflectance spectra in the 0.5–4.2 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m spectral range of binary particulate mixtures of water ice, organics analogue (kerite), and an opaque iron sulphide phase (pyrrhotite) to investigate the spectral effects of varying mixing ratios, endmember grain size, and mixing modality. The laboratory spectra are also compared to different implementations of the Hapke reflectance model (Hapke, 2012). We find that minor amounts (≲1 wt%) of kerite (investigated grain sizes of 45–63 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m and <25 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m) can remain undetected when mixed in coarse-grained (67 ± 31 <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mi mathvariant="sans-serif">μ</mi></semantics></math></inline-formula>m) water ice, suggesting that organics similar to meteoritic insoluble organic matter (IOM) might be characterized by larger detectability thresholds. Additionally, our measurements indicate that the VIS absolute reflectance of water ice-containing mixtures is not necessarily monotonically linked to water ice abundance. The latter is better constrained by spectral indicators such as the band depths of water ice VIS-IR diagnostic absorptions and spectral slopes. Simulation of laboratory spectra of intimate mixtures with a semi-empirical formulation of the Hapke model suggests that simplistic assumptions on the endmember grain size distribution and shape may lead to estimated mixing ratios considerably offset from the nominal values. Finally, laboratory spectra of water ice grains with fine-grained pyrrhotite inclusions (intraparticle mixture) have been positively compared with a modified version of the Hapke model from Lucey and Riner (2011). |
| format |
article |
| author |
Mauro Ciarniello Lyuba V. Moroz Olivier Poch Vassilissa Vinogradoff Pierre Beck Batiste Rousseau Istiqomah Istiqomah Robin Sultana Andrea Raponi Gianrico Filacchione David Kappel Antoine Pommerol Stefan E. Schröder Cedric Pilorget Eric Quirico Vito Mennella Bernard Schmitt |
| author_facet |
Mauro Ciarniello Lyuba V. Moroz Olivier Poch Vassilissa Vinogradoff Pierre Beck Batiste Rousseau Istiqomah Istiqomah Robin Sultana Andrea Raponi Gianrico Filacchione David Kappel Antoine Pommerol Stefan E. Schröder Cedric Pilorget Eric Quirico Vito Mennella Bernard Schmitt |
| author_sort |
Mauro Ciarniello |
| title |
VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| title_short |
VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| title_full |
VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| title_fullStr |
VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| title_full_unstemmed |
VIS-IR Spectroscopy of Mixtures of Water Ice, Organic Matter, and Opaque Mineral in Support of Small Body Remote Sensing Observations |
| title_sort |
vis-ir spectroscopy of mixtures of water ice, organic matter, and opaque mineral in support of small body remote sensing observations |
| publisher |
MDPI AG |
| publishDate |
2021 |
| url |
https://doaj.org/article/cd84370b5d724baf926bf846bda5bf2b |
| work_keys_str_mv |
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1718411159054319616 |