UV to far-IR reflectance spectra of carbonaceous chondrites - I. Implications for remote characterization of dark primitive asteroids targeted by sample-return missions

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Trigo-Rodríguez, Josep Maria, Moyano-Cambero, Carles E., Llorca, Jordi, Fornasier, Sonia, Barucci, Maria Antonietta, Belskaya, Irina N., Martins, Zita, Rivkin, Andrew S., Dotto, Elisabetta, Madiedo Gil, José María, Alonso-Azcárate, Jacinto
• Other Authors: Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear, Ministerio de Ciencia e Innovación (MICIN). España, Consejo Superior de Investigaciones Científicas (CSIC)
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press 2018
• Subjects: Comets general; Instrumentation spectrographs; Meteorites; meteors; meteoroids; Minor planets; asteroids; Techniques imaging spectroscopy; Antarctic; Murchison; Tagish; Tagish Lake; Antarc*
• Online Access: https://idus.us.es/xmlui/handle//11441/71196

We analyse here a wide sample of carbonaceous chondrites from historic falls (e.g. Allende, Cold Bokkeveld, Kainsaz, Leoville, Murchison, Murray, Orgueil and Tagish Lake) and from NASA Antarctic collection.With the analysis of these meteorites we want to get new clues on the role of aqueous alteration in promoting the reflectance spectra diversity evidenced in the most primitive chondrite groups. The selected meteorite specimens are a sample large enough to exemplify how laboratory reflectance spectra of rare groups of carbonaceous chondrites exhibit distinctive features that can be used to remotely characterize the spectra of primitive asteroids. Our spectra cover the full electromagnetic spectrum from 0.2 to 25 μm by using two spectrometers. First one is an ultraviolet (UV)-near-infrared (NIR) spectrometer that covers the 0.2-2 μm window, while the second one is an attenuated total reflectance infrared spectrometer covering the 2-25 μm window. In particular, laboratory analyses in the UV-NIR window allow obtaining absolute reflectance by using standardized measurement procedures. We obtained reflectance spectra of specimens belonging to the CI, CM, CV, CR, CO, CK, CH, R and CB groups of carbonaceous chondrites plus some ungrouped ones, and it allows identifying characteristic features and bands for each class, plus getting clues on the influence of parent body aqueous alteration. These laboratory spectra can be compared with the remote spectra of asteroids, but the effects of terrestrial alteration forming (oxy)hydroxides need to be considered. Ministerio de Ciencia e Innovación AYA2011-26522 CSIC #201050I043