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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 und Alemanno, Giulia und 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, 2019-11-05 - 2019-11-07, Tucson, AZ.

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Kurzfassung

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).

elib-URL des Eintrags:https://elib.dlr.de/131930/
Dokumentart:Konferenzbeitrag (Poster)
Titel:Laboratory studies on the 3 μm spectral features of Mg-rich phyllosilicates and insights for the interpretation of asteroid Ryugu surface spectra
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Maturilli, AlessandroAlessandro.Maturilli (at) dlr.dehttps://orcid.org/0000-0003-4613-9799NICHT SPEZIFIZIERT
Alemanno, GiuliaGiulia.Alemanno (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Helbert, JörnJoern.Helbert (at) dlr.dehttps://orcid.org/0000-0001-5346-9505NICHT SPEZIFIZIERT
Datum:November 2019
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Band:2189
Name der Reihe:LPI Contribution
Status:veröffentlicht
Stichwörter:PSL, Spectroscopy, Phyllosilicates
Veranstaltungstitel:Asteroid Science in the Age of Hayabusa2 and OSIRIS-REx
Veranstaltungsort:Tucson, AZ
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:5 November 2019
Veranstaltungsende:7 November 2019
Veranstalter :The University of Arizona
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erforschung des Weltraums
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):Projekt MASCOT Science und Betrieb (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Leitungsbereich PF
Hinterlegt von: Maturilli, Dr. Alessandro
Hinterlegt am:03 Dez 2019 09:27
Letzte Änderung:24 Apr 2024 20:35

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