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Articles by V. E. Hamilton
Visible, near-, and thermal infrared spectra of asteroid Bennu samples: Relationship to and implications for remote sensing of carbonaceous asteroids
INTRODUCTION The Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) mission (Lauretta et al., 2015) targeted Bennu because its rare B-type spectrum (Clark et al., 2011; DeMeo et al., 2009) suggested that it would comprise primitive, carbonaceous materials that preserve water-bearing minerals and organic compounds formed early in solar system history.
Low thermal inertia of carbonaceous asteroid Bennu driven by cracks observed in returned samples
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Abstract Thermal inertia is used to infer physical properties of asteroid surfaces. The carbonaceous asteroid Bennu has low thermal inertia suggestive of a surface covered in sub-centimeter rock fragments. However, spacecraft observations revealed that Bennu is instead blanketed by boulders of differing physical properties, with the most abundant population displaying very low thermal inertia compared to carbonaceous chondritic meteorites.
By A. Ryan, R.-L. Ballouz, R. J. Macke, J. Biele, S. A. Eckley, A. J. King, C. P. Opeil, M. Pajola, F. Tusberti, J. J. Barnes, H. C. Bates, E. Berger, E. B. Bierhaus, F. Cheng, M. Delbo, J. P. Dworkin, C. M. Elder, D. P. Glavin, C. Gonzalez Verified, P. Haenecour, V. E. Hamilton, R. Hanna, R. A. Harrington, A. R. Hildebrand, D. Hill, K. Ishimaru, M. Kontogiannis, N. G. Lunning, T. McCoy, J. L. Molaro, M. Montoya, H. Nagano, J. F. Plummer, K. Righter, P. L. Sanchez, P. Marco Sánchez, P. F. Schofield, M. A. Siegler, S. Tanaka, T. J. Zega, H. C. Jr, D. S. Lauretta, T. Ishizaki, A. Alasli, C. G. Hoover, K. Jardine, C. Calva, S. Cambioni, D. N. Della Giustina, J. P. Emery, J. Freemantle, R. Fujita, L. T. J. Hanton, E. R. Jawin, E. W. O’Neal, N. Sakatani, C. W. V. Wolner
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Nature
Verified
Mineralogical evidence for hydrothermal alteration of Bennu samples - Nature Geoscience
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Abstract Samples of asteroid (101955) Bennu delivered by the OSIRIS-REx mission offer the opportunity to study pristine planetary materials unchanged by exposure to the terrestrial environment. Here we use a combination of X-ray diffraction and various electron microscopy techniques to explore the detailed mineralogy of Bennu samples and determine the alteration history of the planetesimal protolith from which they originated.
By T. J. Zega, T. McCoy, S. Russell, L. Keller, Z. Gainsforth, S. A. Singerling, C. M. Harrison, G. Libourel, B. Prince, A. L. King, M. Portail, L. W. Le, M. Thompson, M. C. Benner, J. J. Barnes, I. J. Ong, Z. Zeszut, L. R. Wardell, H. C. Bates, P. F. Schofield, N. Almeida, T. Salge, L. Seifert, K. Righter, F. E. Brenker, S. A. Eckley, J. P. Dworkin, R. Jones, G. Domínguez, H. Yurimoto, N. Kawasaki, S. Tachibana, V. E. Hamilton, I. A. Franchi, K. T. Tait, N. E. Timms, F. Jourdan, S. Reddy, D. W. Saxey, M. Kontogiannis, J. Najorka, A. N. Nguyen, H. A. Bechtel, K. Bajo, H. Busemann, W. Rickard
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Nature
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The variety and origin of materials accreted by Bennu’s parent asteroid - Nature Astronomy
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Abstract The first bodies to form in the Solar System acquired their materials from stars, the presolar molecular cloud and the protoplanetary disk. Asteroids that have not undergone planetary differentiation retain evidence of these primary accreted materials. However, geologic processes such as hydrothermal alteration can dramatically change their bulk mineralogy, isotopic compositions and chemistry.
By J. J. Barnes, A. N. Nguyen, K. Bajo, G. A. Brennecka, H. Busemann, S. Crowther, M. Fehr, I. A. Franchi, E. Füri, J. Gilmour, M. M. Grady, R. Greenwood, P. Haenecour, N. Kawasaki, D. Krietsch, L. W. Le, C. Maden, B. Marty, T. S. Peretyazhko, L. Piani, J. Render, S. Russell, M. Schönbächler, Q. R. Shollenberger, L. R. Smith, A. B. Verchovsky, K. J. Wang, K. C. Welten, H. Yurimoto, X. B. Zhao, A. Baczynski, R. W. Burgess, P. L. Clay, J. P. Dworkin, D. P. Glavin, V. E. Hamilton, D. Hill, C. H. House, G. R. Huss, C. E. Jilly, F. Jourdan, L. Keller, T. S. Kruijer, T. McCoy, K. Nagashima, K. Nishiizumi, S. Reddy, D. W. Saxey, N. E. Timms, D. Weis, Z. E. Wilbur, T. J. Zega
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Nature
Verified
Bright carbonate veins on asteroid (101955) Bennu: Implications for aqueous alteration history
The complex history of Bennu's surface The near-Earth asteroid (101955) Bennu is a carbon-rich body with a rubble pile structure, formed from debris ejected by an impact on a larger parent asteroid. The Origins, Spectral Interpretation, Resource Identification, Security, Regolith Explorer (OSIRIS-REx) spacecraft is designed to collect a sample of Bennu's surface and return it to Earth.
Bright carbonate veins on asteroid (101955) Bennu: Implications for aqueous alteration history
Abstract The composition of asteroids and their connection to meteorites provide insight into geologic processes that occurred in the early Solar System. We present spectra of the Nightingale crater region on near-Earth asteroid Bennu with a distinct infrared absorption around 3.4 μm. Corresponding images of boulders show centimeters-thick, roughly meter-long bright veins.
Bright carbonate veins on asteroid (101955) Bennu: Implications for aqueous alteration history
Abstract The composition of asteroids and their connection to meteorites provide insight into geologic processes that occurred in the early Solar System. We present spectra of the Nightingale crater region on near-Earth asteroid Bennu with a distinct infrared absorption around 3.4 μm. Corresponding images of boulders show centimeters-thick, roughly meter-long bright veins.
Chemistry, Mineralogy, and Grain Properties at Namib and High Dunes, Bagnold Dune Field, Gale Crater, Mars: A Synthesis of Curiosity Rover Observations - Ehlmann - 2017 - Journal of Geophysical Research: Planets - Wiley Online Library
The Mars Science Laboratory Curiosity rover performed coordinated measurements to examine the textures and compositions of aeolian sands in the active Bagnold dune field. The Bagnold sands are rounded to subrounded, very fine- to medium- sized (~45-500?µm) with ?6 distinct grain colors.
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