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Laboratory studies on the 3 μm spectral features of Mg-rich phyllosilicates and insights for the interpretation of asteroid Ryugu surface spectra

Maturilli, Alessandro and Alemanno, Giulia and Helbert, Jörn (2019) Laboratory studies on the 3 μm spectral features of Mg-rich phyllosilicates and insights for the interpretation of asteroid Ryugu surface spectra. Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx, 5. - 7. Nov. 2019, Tucson, AZ.

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Abstract

The Near Infrared Spectrometer (NIRS3) on Hayabusa 2 mission detected a weak and narrow absorption feature centered at 2.72 µm across the entire observed surface of the asteroid 162173 Ryugu [1]. The presence of an absorption feature at 2.72 µm is indicative of the presence of (OH)-bearing minerals. Furthermore the position of the observed peak can be likely associated to that of the Mg-OH features, as in Mg-rich phyllosilicates. [1] However, the collected spectra from the Ryugu surface show no other absorption features in the 3 µm region. It has been suggested that thermal alteration processes, can darken the surfaces of carbonaceous chondrites, thus decreasing the reflectance values around 3 µm. In addition, thermal alteration processes, have been taken into account to explain the formation of Ryugu asteroid [2]. To investigate on this point and to check the behavior of the spectral features around 3 µm with thermal alteration, we performed laboratory experiments on two Mg-rich phyllosilicates (serpentine and saponite). In particular, we studied two different situations: 1) thermal alteration at increasing T - the samples were heated at different steps of 100°C, starting from 100°C up to 700°C, for 4 hours each; 2) long time heating at constant T - samples were heated at constant T~250°C for 1 month (1th step) and then for 2 months (2nd step).

Item URL in elib:https://elib.dlr.de/131930/
Document Type:Conference or Workshop Item (Poster)
Title:Laboratory studies on the 3 μm spectral features of Mg-rich phyllosilicates and insights for the interpretation of asteroid Ryugu surface spectra
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.dehttps://orcid.org/0000-0003-4613-9799
Alemanno, GiuliaGiulia.Alemanno (at) dlr.deUNSPECIFIED
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505
Date:November 2019
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2189
Series Name:LPI Contribution
Status:Published
Keywords:PSL, Spectroscopy, Phyllosilicates
Event Title:Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx
Event Location:Tucson, AZ
Event Type:international Conference
Event Dates:5. - 7. Nov. 2019
Organizer:The University of Arizona
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project MASCOT Science and operation
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Leitungsbereich PF
Deposited By: Maturilli, Alessandro
Deposited On:03 Dec 2019 09:27
Last Modified:03 Dec 2019 09:27

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