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dc.contributor.authorSharkey, B.N.L.
dc.contributor.authorReddy, V.
dc.contributor.authorSanchez, J.A.
dc.contributor.authorIzawa, M.R.M.
dc.contributor.authorHarris, W.M.
dc.date.accessioned2021-09-24T21:02:55Z
dc.date.available2021-09-24T21:02:55Z
dc.date.issued2021
dc.identifier.citationSharkey, B. N. L., Reddy, V., Sanchez, J. A., Izawa, M. R. M., & Harris, W. M. (2021). Complex Water-ice Mixtures on NII Nereid: Constraints from NIR Reflectance. Planetary Science Journal, 2(4).
dc.identifier.issn2632-3338
dc.identifier.doi10.3847/PSJ/ac0bbe
dc.identifier.urihttp://hdl.handle.net/10150/661945
dc.description.abstractNereid, Neptune's third-largest satellite, lies in an irregular orbit and is the only outer satellite in the system (apart from Triton) that can be spectroscopically characterized with the current generation of Earth-based telescopes. We report our results on the spectral characterization of Nereid using its reflectance spectrum from 0.8 to 2.4 μm, providing the first measurements over the range of 0.8-1.4 μm. We detect spectral absorption features of crystalline water ice in close agreement with previous measurements. We show that model fits of simple intimate mixtures including water ice do not provide simultaneous matches to absorption band depths at 1.5 and 2.0 μm when accounting for the spectral continuum. Possible solutions include invoking a more complex continuum, including both crystalline and amorphous water ice, and allowing for submicron-sized grains. We show that mixtures including magnetite and the CM2 chondrite Murchison provide a flexible framework for interpreting spectral variation of bodies with neutral-sloped spectra like that of Nereid. Magnetite in particular provides a good match to the spectral continuum without requiring the presence of tholin-like organics. We note that carbonaceous chondrites and their components may be useful analogs for the non-ice components of outer solar system bodies, consistent with recent findings by Fraser et al. Comparison to spectra of large trans-Neptunian objects and satellites of Uranus show that Nereid's low albedo, deep water bands, and neutral color is distinct from many other icy objects, but such comparisons are limited by an incomplete understanding of spectral variability among ∼100 km-sized icy bodies 2021. The Author(s). Published by the American Astronomical Society. © 2021. The Author(s). Published by the American Astronomical Society.
dc.language.isoen
dc.publisherIOP Publishing
dc.rightsCopyright © 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectIrregular satellites (2027)
dc.subjectNatural satellites (solar system) (1089)
dc.subjectNear infrared astronomy (1093)
dc.subjectNeptunian satellites (1098)
dc.subjectSmall solar system bodies (1469)
dc.titleComplex Water-ice Mixtures on NII Nereid: Constraints from NIR Reflectance
dc.typeArticle
dc.typetext
dc.contributor.departmentLunar and Planetary Laboratory, University of Arizona
dc.identifier.journalPlanetary Science Journal
dc.description.noteOpen access journal
dc.description.collectioninformationThis 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 repository@u.library.arizona.edu.
dc.eprint.versionFinal published version
dc.source.journaltitlePlanetary Science Journal
refterms.dateFOA2021-09-24T21:02:55Z


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Copyright © 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.
Except where otherwise noted, this item's license is described as Copyright © 2021. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.