Laboratory measurements of anhydrous minerals mixed with hyperfine hydrated minerals to support interpretation of infrared reflectance observations of planetary surfaces

Poggiali, Giovanni; Lelarge, S. Iannini; Brucato, J. R.; Masotta, Matteo; Corazzi, Maria Angela; Fornaro, Teresa; Brown, Adrian; Mandon, Lucia; Randazzo, Nicolas

doi:10.1016/j.icarus.2023.115449

Cited by 3 publications

(6 citation statements)

References 66 publications

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“…A possible explanation to this observation is related to the arrangement of small grains in the presence of large grains. As observed in previous laboratory experiments as well (Poggiali et al 2023), small grains mixed with large grains tend to stick to the surface of the latter by electrostatic bonding. The larger the surface area of the bright grains, the higher the number of dark grains that can be accommodated on the surface before creating agglomerates.…”

Section: Discussion On Laboratory Resultssupporting

confidence: 80%

“…Bytownite (Ca,Na)(Si,Al) 4 O 8 is part of feldspar mineral group in the plagioclase series, while augite (Ca,Mg,Fe 2+ ,Fe 3+ ,Ti,Al) 2 (Si,Al) 2 O is a mineral of the pyroxene family (both characterized in Poggiali et al 2023). Plagioclase and pyroxene were used in this work, always mixed together at 50/50 weight percentage [wt.%] with the same grain size.…”

Section: Preparation Of Mixturesmentioning

confidence: 99%

“…To perform the preparation of the samples, we developed a protocol preliminarily introduced in Poggiali et al (2023). The protocol consists of five phases presented below.…”

Section: Preparation Of Mixturesmentioning

confidence: 99%

“…To unveil the properties of complex mixtures with dark components, laboratory studies are among the most powerful tools at our disposal. Regarding the study of spectroscopic features and the influence of grain size on the spectrum, numerous studies have been conducted in the past (e.g., Salisbury & Walter 1989;Salisbury & Wald 1992;Hiroi & Pieters 1992;Pieters et al 1993;Mustard & Hays 1997;Cooper & Mustard 1999;Le Bras & Erard 2003;Piatek et al 2004;Milliken & Mustard 2007;Sultana et al 2021Sultana et al , 2023Poggiali et al 2023). Several main features are altered at different particle sizes: spectral slope, absolute reflectance values, and spectral contrast of absorption features (i.e., the band depth).…”

Section: Introductionmentioning

confidence: 99%

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Grain size effects on the infrared spectrum of mineral mixtures with dark components: New laboratory experiments to interpret low-albedo rocky planetary surfaces

Poggiali,

Fossi,

Wargnier

et al. 2024

A&A

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A number of bodies in the Solar System are characterized by dark surfaces, from carbonaceous asteroids to the enigmatic surface of Phobos and Deimos. Our understanding of the spectroscopic behavior of low-albedo surfaces remains incomplete. To improve the interpretation of remote sensing data, laboratory studies continue to serve as a pivotal tool for unveiling the physical state and composition of such surfaces. Several processes can be simulated in the laboratory, however, the preparation and analysis of a complex mixing of analog material is one of the most fundamental among them, while also being one of the most complex when multiple components are used. In this work, we aim to study how dark material mixed with basaltic material at different grain sizes can affect the spectroscopic features from the near- to mid- infrared (1.25-25 $ m$). Our sample set includes four series of basaltic mix (feldspar and pyroxene) at different grain sizes from < 50 $ m$ to 1000 $ m$, mixed with amorphous carbon at increasing weight percentages ranging from 1<!PCT!> to 50<!PCT!>. We analyzed several features on the spectrum of each mineral mixture. In particular, we investigated the behavior of the: (i) near-infrared slope; (ii) 2.7 $ m$ OH-stretching band; (iii) Christiansen features; and (iv) Reststrahlen band and Transparency feature. The measurements presented in this work, which take into account a large wavelength range for the first time, point toward a critical effect of dark material, but with a different outcomes for each grain size. Some of the most interesting results involve the slope trend of modification with dark material and the variant behavior of the Reststrahlen band and Transparency feature. This dataset will offer a key support in the interpretation of data collected on dark surfaces by past and future space missions. This knowledge will be also important in the context of linking analyses of returned samples with remote sensing data collected on planetary surfaces.

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Section: Discussion On Laboratory Resultssupporting

confidence: 80%

Section: Preparation Of Mixturesmentioning

confidence: 99%

“…To perform the preparation of the samples, we developed a protocol preliminarily introduced in Poggiali et al (2023). The protocol consists of five phases presented below.…”

Section: Preparation Of Mixturesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Grain size effects on the infrared spectrum of mineral mixtures with dark components: New laboratory experiments to interpret low-albedo rocky planetary surfaces

Poggiali,

Fossi,

Wargnier

et al. 2024

A&A

Self Cite

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“…The intense band at 2.74 µm characteristic of hydrated silicates dominate the spectrum that would otherwise not have been observed if only anhydrous silicates were present. In contrast, the midinfrared spectrum is signi cantly less affected by the presence of hydrated ne grains and the spectroscopic characteristics of anhydrous minerals continue to be dominant (Poggiali et al 2023).…”

Section: )mentioning

confidence: 99%

Daily temperature changes reveal compositional variation on asteroid (101955) Bennu

Brucato,

Poggiali,

Hamilton

et al. 2023

Preprint

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Carbonaceous rubble pile asteroid 101955 Bennu was observed by the OSIRIS-REx Thermal Emission Spectrometer (OTES) at different times of the day with different surface temperatures. Prior results from OSIRIS-REx revealed that hydrated minerals are ubiquitous on Bennu, and OTES showed that Bennu’s surface is dominated by highly hydrated minerals, such those found in the bulk matrix of CI, CM and some CR carbonaceous chondrite meteorites. In this work, we analyzed the OTES spectroscopic behavior in response to the change in temperatures throughout the day, and we detected anomalous temperature-dependent variations of mid-infrared (5.71 to 100 µm) spectroscopic features. Correlating temperature-dependent variation of infrared features with mineralogical composition, we identified that 9% of Bennu surface is dominated by anhydrous minerals. This discovery further constraints Bennu's origin and evolutionary history. Bennu is made up of material reaccumulated after a catastrophic disruption of very different parent bodies. This identifies it as possible source of heterogeneous meteorite fall such as Kaidun and Almatha Sitta.

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Spectro-photometry of Phobos simulants

Wargnier,

Gautier,

Doressoundiram

et al. 2024

Icarus

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Laboratory measurements of anhydrous minerals mixed with hyperfine hydrated minerals to support interpretation of infrared reflectance observations of planetary surfaces

Cited by 3 publications

References 66 publications

Grain size effects on the infrared spectrum of mineral mixtures with dark components: New laboratory experiments to interpret low-albedo rocky planetary surfaces

Grain size effects on the infrared spectrum of mineral mixtures with dark components: New laboratory experiments to interpret low-albedo rocky planetary surfaces

Daily temperature changes reveal compositional variation on asteroid (101955) Bennu

Spectro-photometry of Phobos simulants

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