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J. J. Barnes

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Articles

Low thermal inertia of carbonaceous asteroid Bennu driven by cracks observed in returned samples

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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
| Nature Verified
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.
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Mineralogical evidence for hydrothermal alteration of Bennu samples - Nature Geoscience

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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
| Nature Verified
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.
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The variety and origin of materials accreted by Bennu’s parent asteroid - Nature Astronomy

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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
| Nature Verified
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.
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