@article{66875a5f8196441a9d0f8cd4be117ae9,
title = "Variability, absorption features, and parent body searches in {"}spectrally featureless{"} meteorite reflectance spectra: Case study - Tagish Lake",
abstract = "Reflectance spectra of many asteroids and other Solar System bodies are commonly reported as {"}featureless{"}. Here, we show that weak but consistently detectable absorption bands are observable in 200-2500. nm spectra of the Tagish Lake meteorite, a likely compositional and spectral analogue for low-albedo, {"}spectrally-featureless{"} asteroids. Tagish Lake presents a rare opportunity to study multiple lithologies within a single meteorite. Reflectance spectra of Tagish Lake display significant variation between different lithologies. The spectral variations are due in part to mineralogical variations between different Tagish Lake lithologies. Ultraviolet reflectance spectra (200-400. nm), few of which have been reported in the literature to date, reveal albedo and spectral ratio variations as a function of mineralogy. Similarly visible-near infrared reflectance spectra reveal variations in albedo, spectral slope, and the presence of weak absorption features that persist across different lithologies and can be attributed to various phases present in Tagish Lake. These observations demonstrate that significant spectral variability may exist between different lithologies of Tagish Lake, which may affect the interpretation of potential source body spectra. It is also important to consider the spectral variability within the meteorite before excluding compositional links between possible parent bodies in the main belt and Tagish Lake. Tagish Lake materials may also be spectral-compositional analogues for materials on the surfaces of other dark asteroids, including some that are targets of upcoming spacecraft missions. Tagish Lake has been proposed as a spectral match for 'ultra-primitive' D or P-type asteroids, and the variability reported here may be reflected in spatially or rotationally-resolved spectra of possible Tagish Lake parent bodies and source objects in the Near-Earth Asteroid population. A search for objects with spectra similar to Tagish Lake has been carried out among the Near-Earth Asteroids. We have identified three possible spectral matches, the best of which are Asteroids (326732) 2003 HB6, and (17274) 2000 LC16.",
keywords = "Asteroids, surfaces, Meteorites, Near-Earth objects, Spectroscopy",
author = "Izawa, {M. R.M.} and Craig, {M. A.} and Applin, {D. M.} and Sanchez, {J. A.} and V. Reddy and {Le Corre}, L. and P. Mann and Cloutis, {E. A.}",
note = "Funding Information: MRMI acknowledges funding from the NSERC CREATE Canadian Astrobiology Training Program and the Mineralogical Association of Canada . The University of Winnipeg{\textquoteright}s HOSERLab was established with funding from the Canada Foundation for Innovation , the Manitoba Research Innovations Fund and the Canadian Space Agency , whose support is gratefully acknowledged. This study was supported by research grants from NSERC , the Canadian Space Agency and the University of Winnipeg . VR would like to thank NASA Near-Earth Object Observation program grant NNX14AL06G (PI: Reddy) for supporting parts of this research. All (or part) of the data utilized in this publication were obtained and made available by the MIT-UH-IRTF Joint Campaign for NEO Reconnaissance. The IRTF is operated by the University of Hawaii under Cooperative Agreement no. NCC 5-538 with the National Aeronautics and Space Administration, Office of Space Science, Planetary Astronomy Program. The MIT component of this work is supported by NASA grant 09-NEOO009-0001 , and by the National Science Foundation under Grants Nos. 0506716 and 0907766 . Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of NASA or the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration . This publication also makes use of data products from NEOWISE, which is a project of the Jet Propulsion Laboratory/California Institute of Technology, funded by the Planetary Science Division of the National Aeronautics and Space Administration . Taxonomic type results presented in this work were determined, in whole or in part, using a Bus–DeMeo Taxonomy Classification Web tool by Stephen M. Slivan, developed at MIT with the support of National Science Foundation Grant 0506716 and NASA Grant NAG5-12355 . Thanks to Alan Hildebrand, Peter Brown, Phil McCausland, Roberta Flemming and Penny King for many useful discussions. This research has made use of the NASA Astrophysical Data System. Publisher Copyright: {\textcopyright} 2015 Elsevier Inc.",
year = "2015",
month = jul,
day = "1",
doi = "10.1016/j.icarus.2015.04.013",
language = "English",
volume = "254",
pages = "324--332",
journal = "Icarus",
issn = "0019-1035",
publisher = "Academic Press Inc.",
}