AffiliationUniv Arizona, Lunar & Planetary Lab
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PublisherIOP PUBLISHING LTD
CitationDETECTION OF WATER AND/OR HYDROXYL ON ASTEROID (16) Psyche 2016, 153 (1):31 The Astronomical Journal
JournalThe Astronomical Journal
Rights© 2016. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at email@example.com.
AbstractIn order to search for evidence of hydration on M-type asteroid (16) Psyche, we observed this object in the 3 mu m spectral region using the long-wavelength cross-dispersed (LXD: 1.9-4.2 mu m) mode of the SpeX spectrograph/imager at the NASA Infrared Telescope Facility. Our observations show that Psyche exhibits a 3 mu m absorption feature, attributed to water or hydroxyl. The 3 m absorption feature is consistent with the hydration features found on the surfaces of water-rich asteroids, attributed to OH- and/or H2O-bearing phases (phyllosilicates). The detection of a 3 mu m hydration absorption band on Psyche suggests that this asteroid may not be a. metallic core, or it could be a metallic core that has been impacted by carbonaceous material over the past 4.5 Gyr. Our results also indicate rotational spectral variations, which we suggest reflect heterogeneity in the metal/silicate ratio on the surface of Psyche.
VersionFinal published version
SponsorsNASA [NNH14CK55B]; Eugene M. Shoemaker Postdoctoral Fellowship (NASA Planetary Geology and Geophysics Program); NASA Planetary Geology and Geophysics grants [NNX14AN05G, NNX14AN35G]; NASA Solar System Observing grant [NNX16AE91G]