دورية أكاديمية
Optical Constants of Martian Dust Analogs at UV–Visible–Near-infrared Wavelengths
| العنوان: | Optical Constants of Martian Dust Analogs at UV–Visible–Near-infrared Wavelengths |
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| المؤلفون: | Julia Martikainen, Olga Muñoz, Teresa Jardiel, Juan Carlos Gómez Martín, Marco Peiteado, Yannick Willame, Antti Penttilä, Karri Muinonen, Gerhard Wurm, Tim Becker |
| المصدر: | The Astrophysical Journal Supplement Series, Vol 268, Iss 2, p 47 (2023) |
| بيانات النشر: | IOP Publishing, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Astrophysics |
| مصطلحات موضوعية: | Mars, Computational methods, Planetary surfaces, Astrophysics, QB460-466 |
| الوصف: | We present an advanced light-scattering model to retrieve the optical constants of three Martian dust analogs: Johnson Space Center regolith simulant, Enhanced Mojave Mars Simulant, and Mars Global Simulant. The samples are prepared to have narrow particle-size distributions within the geometric-optics domain. We carry out laboratory measurements to obtain the particle-size distributions, shapes, and diffuse reflectance spectra of the Martian analogs deposited on a surface. Our model framework includes a ray-optics code to compute scattering properties for individual particles, and a radiative-transfer treatment to simulate the surface. The irregular shapes of the dust particles are taken into account in the model. We compare our derived imaginary parts of the refractive indices with those in the literature and find that they are much smaller than the ones that are commonly used for Martian dust. A sensitivity study shows that the retrieved optical constants are sensitive to the particle shape, which needs to be accounted for in applications that use different shapes. Finally, the derived values are validated by using them to reproduce the reflectance spectrum of the Martian surface regolith as observed by the Nadir and Occultation for Mars Discovery instrument on board the ExoMars mission. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 1538-4365 0067-0049 |
| Relation: | https://doaj.org/toc/0067-0049 |
| DOI: | 10.3847/1538-4365/acf0be |
| URL الوصول: | https://doaj.org/article/61feeb357c1f479282b854292dfa4a64 |
| رقم الأكسشن: | edsdoj.61feeb357c1f479282b854292dfa4a64 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 15384365 00670049 |
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| DOI: | 10.3847/1538-4365/acf0be |