| Issue |
A&A
Volume 696, April 2025
|
|
|---|---|---|
| Article Number | A66 | |
| Number of page(s) | 19 | |
| Section | Catalogs and data | |
| DOI | https://doi.org/10.1051/0004-6361/202452540 | |
| Published online | 04 April 2025 | |
Mid-infrared absorption spectra and mass absorption coefficients for 23 chondrites
Dependence on composition and grain size
1
Instituto de Estudios Astrofísicos, Facultad de Ingeniería y Ciencias, Universidad Diego Portales,
Santiago,
Chile
2
Cosmic Dust Laboratory, Universidad Diego Portales,
Santiago,
Chile
3
Millennium Nucleus on Young Exoplanets and their Moons (YEMS),
Santiago,
Chile
4
Instituto de Ciencias Básicas, Facultad de Ingenería y Ciencias, Universidad Diego Portales,
Santiago,
Chile
5
Departamento de Ciencias Geológicas, Universidad Católica del Norte,
Antofagasta,
Chile
6
Centro de Astrofísica y Tecnologías Asociadas (CATA),
Macul,
Chile
7
Institut für Planetologie, Westfälische Wilhelms-Universität Universität Münster,
Münster,
Germany
8
Instituto de Investigacion en Astronomía y Ciencias Planetarias, Universidad de Atacama,
Copiapó,
Chile
9
Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile,
Santiago,
Chile
★ Corresponding author; grace.batalla@mail.udp.cl
Received:
9
October
2024
Accepted:
24
February
2025
Aims. We present mid-infrared transmission spectra from 2 to 23 μm of the 23 Atacama Desert chondrites of different types (carbonaceous Ornans and ordinary of H, L, and LL groups) as well as of some pure minerals (olivine and diopside). We focus on the characteristics of silicate at 10 μm and 20 μm, analyzing the influence of composition and grain size on peak strengths and spectral shapes. We present the first results of the Cosmic Dust Laboratory, a dedicated facility at the Universidad Diego Portales equipped with a VERTEX 80v vacuum Fourier transform infrared spectrometer.
Methods. Through milling and sieving samples, we obtained different ranges of particle sizes to study the effect of grain size on the intensity and shape of the spectrum.
Results. The resulting spectral library can be compared with astronomical data of protoplanetary disks, debris disks, and even white dwarf disks obtained with instruments such as MIRI on board the James Webb Space Telescope and MATISSE on the Very Large Telescope Interferometer. We also present mass absorption coefficient values, which can be used for radiative transfer modeling of astronomical observations. This study aims to improve dust opacities for astronomical applications, with a focus on circumstellar disks.
Key words: opacity / techniques: imaging spectroscopy / astronomical databases: miscellaneous / meteorites, meteors, meteoroids / protoplanetary disks
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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