Title :

Space Weathering Affects the Remote Near-IR Identification of Phyllosilicates

Author(s) :

Rubino, Stefano [Auteur]
Institut d'astrophysique spatiale [IAS]
Lantz, Cateline [Auteur]
Institut d'astrophysique spatiale [IAS]
Baklouti, Donia [Auteur]
Institut d'astrophysique spatiale [IAS]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations (UMET) - UMR 8207
Borondics, Ferenc [Auteur]
Synchrotron SOLEIL [SSOLEIL]
Brunetto, Rosario [Auteur]
Institut d'astrophysique spatiale [IAS]

Conference title :

14th Europlanet Science Congress

City :

held virtually

Country :

France

Start date of the conference :

2020-10

ISSN :

2632-3338

English keyword(s) :

Space weather
Spectroscopy
Near infrared astronomy
Infrared astronomy
Laboratory astrophysics
Small solar system bodies
Surface composition
Surface processes

HAL domain(s) :

Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]
Physique [physics]/Physique [physics]/Physique de l'espace [physics.space-ph]

English abstract : [en]

Near-infrared (NIR) spectrometers on board current sample return missions Hayabusa2 and the Origins-Spectral Interpretation-Resource Identification-Security-Regolith Explorer (OSIRIS-REx) from primitive bodies detected the ...
Show more >Near-infrared (NIR) spectrometers on board current sample return missions Hayabusa2 and the Origins-Spectral Interpretation-Resource Identification-Security-Regolith Explorer (OSIRIS-REx) from primitive bodies detected the presence of hydrated silicates on the surface of asteroids Ryugu and Bennu, respectively. These detections relied upon the study of the 2.7 μm OH-stretching spectral feature, whose peak position is related to the composition and structure of minerals. However, space weathering might alter the band profile, depth and position, thus complicating the interpretation of remote sensing data. In order to better understand these processes and provide support to space missions, we performed ion bombardment experiments on serpentine and saponite analogs. These two phyllosilicates are among the dominant mineral phases found in hydrated carbonaceous chondrites, which are possible analogs to surface materials observed on these primitive asteroids. We studied the behavior of the 2.7 μm band as a function of ion fluence and found that the evolution of the phyllosilicate depends on its nature. For the saponite sample, the band is only slightly affected by ion bombardment, while for both serpentine samples it shifts toward longer wavelengths. For both samples, peak intensity and width is not strongly affected. The band shift for serpentine indicates that space weathering introduces a bias in the interpretation of NIR remote sensing observations of phyllosilicates. The shift observed in our experiments can be detected by instruments on board Hayabusa2 and OSIRIS-REx, depending on the geometry of observation. Our findings provide support to the interpretation of such data.Show less >

Language :

Anglais

Peer reviewed article :

Non

Audience :

Internationale

Popular science :

Non

Related reference(s) :

https://meetingorganizer.copernicus.org/EPSC2020/EPSC2020-126.html
http://hdl.handle.net/20.500.12210/37401

ANR Project :

Composition des surfaces du Système Solaire de bas albédo
Physics of the 2 infinities and the origins
Idex Paris-Saclay

Administrative institution(s) :

Université de Lille
CNRS
INRAE
ENSCL

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Research team(s) :

Matériaux Terrestres et Planétaires

Submission date :

2024-02-14T16:27:38Z
2024-02-16T10:46:24Z