A subsurface layer on asteroid (101955) Bennu and implications for rubble pile asteroid evolution

被引：10

作者：

Bierhaus, E. B. ^{[1
]}

Rossmann, F. ^{[2
]}

Johnson, C. ^{[2
,3
]}

Daly, R. T. ^{[4
]}

Golish, D. ^{[5
]}

Nolau, J. ^{[6
]}

Allen, A. ^{[6
]}

Campins, H. ^{[6
]}

Pajola, M. ^{[7
]}

Rizk, B. ^{[5
]}

D'Aubigny, C. ^{[5
]}

Dellagiustina, D. ^{[5
]}

Cloutis, E. ^{[8
]}

Trang, D. ^{[9
]}

Lauretta, D. S. ^{[5
]}

机构：

[1] Lockheed Martin Space, Littleton, CO 80125 USA

[2] Univ British Columbia, Vancouver, BC, Canada

[3] Planetary Sci Inst, Tucson, AZ USA

[4] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA

[5] Univ Arizona, Lunar & Planetary Lab, Tucson, AZ 85721 USA

[6] Univ Cent Florida, Orlando, FL USA

[7] Astron Observ Padova, INAF, Vic Osservat 5, I-35122 Padua, Italy

[8] Univ Manitoba Winnipeg, Winnipeg, MB, Canada

[9] Univ Hawaii Manoa, Hawai Inst Geophys & Planetol, Honolulu, HI USA

来源：

ICARUS | 2023年 / 406卷

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

Asteroid Bennu; Geological processes; Regoliths; Impact craters; SMALL-SCALE TOPOGRAPHY; NEAR-EARTH OBJECTS; TARGETS IMPLICATIONS; REGOLITH; SIZE; CRATERS; DISTRIBUTIONS; THICKNESS; PLANETARY; MATHILDE;

D O I：

10.1016/j.icarus.2023.115736

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We use observations of Bennu's impact craters, and measurements of particle sizes seen in images from the OSIRIS-REx (the Origins, Spectral Interpretation, Resource Identification Regolith Explorer sample-return mission) sampling event, to conclude there is a -global sub-surface layer of finergrained material on Bennu. The layer is evident in particle measurements from areas inside and around craters, roughness assessments of crater interiors vs. surrounding terrain, crater colors, crater depth-to-diameter (d/D) ratios, and the global crater size-frequency distribution. All data sets show a transition in behavior at crater diameters between 20 m and 40 m, with the most abrupt changes at-25 m diameter. Based on the depth of-25 m diameter craters, we infer that the layer is 1-4 m thick. The reddest craters are the youngest craters, and there is a trend to older ages as redness decreases. The decrease in redness is characterized by an initial, rapid fade, followed by a slower fade. The reduction in expected crater abundance with diameters-40-80 m, when extrapolating from larger sizes, is consistent with impact armoring caused by deeper, large sub-surface boulders depressing crater diameter. The existence of the layer appears to be a natural byproduct of impacts across a wide energy range and can be described as a "punctuated equilibrium": small, frequent impacts contribute to the local production of finer-grained particles and locally mix smaller particles into the subsurface; larger, less-frequent large impacts eject the fine-grained material, exposing interior boulders, and resetting the finer-grained particle population in that area. Other processes, e.g. thermal fracturing, could also contribute to the production of fine-grained material on rapid timescales. Extrapolating to the broader asteroid population and considering the production and preservation of small particles is related to target strength, surface acceleration, and impact speeds, we expect to find such layers on other asteroids, and that the layer thickness and depth will vary with composition, size, and orbital parameters.

引用

页数：27

共 85 条

[1] STANDARD TECHNIQUES FOR PRESENTATION AND ANALYSIS OF CRATER SIZE-FREQUENCY DATA [J].

不详 .

ICARUS, 1979, 37 (02) :467-474

[2] An artificial impact on the asteroid (162173) Ryugu formed a crater in the gravity-dominated regime [J].

Arakawa, M. ;

Saiki, T. ;

Wada, K. ;

Ogawa, K. ;

Kadono, T. ;

Shirai, K. ;

Sawada, H. ;

Ishibashi, K. ;

Honda, R. ;

Sakatani, N. ;

Iijima, Y. ;

Okamoto, C. ;

Yano, H. ;

Takagi, Y. ;

Hayakawa, M. ;

Michel, P. ;

Jutzi, M. ;

Shimaki, Y. ;

Kimura, S. ;

Mimasu, Y. ;

Toda, T. ;

Imamura, H. ;

Nakazawa, S. ;

Hayakawa, H. ;

Sugita, S. ;

Morota, T. ;

Kameda, S. ;

Tatsumi, E. ;

Cho, Y. ;

Yoshioka, K. ;

Yokota, Y. ;

Matsuoka, M. ;

Yamada, M. ;

Kouyama, T. ;

Honda, C. ;

Tsuda, Y. ;

Watanabe, S. ;

Yoshikawa, M. ;

Tanaka, S. ;

Terui, F. ;

Kikuchi, S. ;

Yamaguchi, T. ;

Ogawa, N. ;

Ono, G. ;

Yoshikawa, K. ;

Takahashi, T. ;

Takei, Y. ;

Fujii, A. ;

Takeuchi, H. ;

Yamamoto, Y. .

SCIENCE, 2020, 368 (6486) :67-+

[3] Geologic Context of the OSIRIS-REx Sample Site from High-resolution Topography and Imaging [J].

Barnouin, O. S. ;

Jawin, E. R. ;

Daly, R. T. ;

Ballouz, R. -l. ;

Daly, M. G. ;

Seabrook, J. A. ;

Michel, P. ;

Zhang, Y. ;

Johnson, C. L. ;

Walsh, K. J. ;

Al Asad, M. M. ;

Gaskell, R. ;

Weirich, J. ;

Palmer, E. ;

Bierhaus, E. B. ;

Nolan, M. C. ;

Wolner, C. W. V. ;

Lauretta, D. S. .

PLANETARY SCIENCE JOURNAL, 2022, 3 (04)

[4] Shape of (101955) Bennu indicative of a rubble pile with internal stiffness [J].

Barnouin, O. S. ;

Daly, M. G. ;

Palmer, E. E. ;

Gaskell, R. W. ;

Weirich, J. R. ;

Roberts, J. H. ;

Perry, M. E. ;

Daly, R. T. ;

Seabrook, J. A. ;

Espiritu, R. C. ;

Nair, A. H. ;

Nguyen, L. ;

Neumann, G. A. ;

Ernst, C. M. ;

Nolan, M. C. ;

Adam, C. D. ;

Moreau, M. C. ;

Rizk, B. ;

D'Aubigny, C. Y. Drouet ;

Jawin, E. R. ;

Walsh, K. J. ;

Michel, P. ;

Mazarico, E. M. ;

Scheeres, D. J. ;

McMahon, J. W. ;

Bottke, W. F. ;

Sugita, S. ;

Hirata, N. ;

Watanabe, S. -i. ;

Highsmith, D. E. ;

Small, J. ;

Vokrouhlicky, D. ;

Bowles, N. E. ;

Brown, E. ;

Hanna, K. L. Donaldson ;

Warren, T. ;

Brunet, C. ;

Chicoine, R. A. ;

Desjardins, S. ;

Gaudreau, D. ;

Haltigin, T. ;

Millington-Veloza, S. ;

Rubi, A. ;

Aponte, J. ;

Gorius, N. ;

Lunsford, A. ;

Allen, B. ;

Grindlay, J. ;

Guevel, D. ;

Hoak, D. .

NATURE GEOSCIENCE, 2019, 12 (04) :247-+

[5] Impacts into coarse-grained spheres at moderate impact velocities: Implications for cratering on asteroids and planets [J].

Barnouin, Olivier S. ;

Daly, R. Terik ;

Cintala, Mark J. ;

Crawford, David A. .

ICARUS, 2019, 325 :67-83

[6] Small-scale topography of 25143 Itokawa from the Hayabusa laser altimeter [J].

Barnouin-Jha, Olivier S. ;

Cheng, Andrew F. ;

Mukai, Tadashi ;

Abe, Shinsuke ;

Hirata, Naru ;

Nakamura, Ryosuke ;

Gaskell, Robert W. ;

Saito, Jun ;

Clark, Beth E. .

ICARUS, 2008, 198 (01) :108-124

[7] Crater population on asteroid (101955) Bennu indicates impact armouring and a young surface [J].

Bierhaus, E. B. ;

Trang, D. ;

Daly, R. T. ;

Bennett, C. A. ;

Barnouin, O. S. ;

Walsh, K. J. ;

Ballouz, R. -l. ;

Bottke, W. F. ;

Burke, K. N. ;

Perry, M. E. ;

Jawin, E. R. ;

McCoy, T. J. ;

Connolly, H. C., Jr. ;

Daly, M. G. ;

Dworkin, J. P. ;

DellaGiustina, D. N. ;

Gay, P. L. ;

Brodbeck, J. I. ;

Nolau, J. ;

Padilla, J. ;

Stewart, S. ;

Schwartz, S. ;

Michel, P. ;

Pajola, M. ;

Lauretta, D. S. .

NATURE GEOSCIENCE, 2022, 15 (06) :440-+

[8] Bennu regolith mobilized by TAGSAM: Expectations for the OSIRIS-REx sample collection event and application to understanding naturally ejected particles [J].

Bierhaus, E. B. ;

Songer, J. T. ;

Clark, B. C. ;

Dubisher, R. D. ;

Deden, S. L. ;

Payne, K. S. ;

Wurts, D. ;

McMahon, J. W. ;

Rozitis, B. ;

Lauretta, D. S. .

ICARUS, 2021, 355

[9] The OSIRIS-REx Spacecraft and the Touch-and-Go Sample Acquisition Mechanism (TAGSAM) [J].

Bierhaus, E. B. ;

Clark, B. C. ;

Harris, J. W. ;

Payne, K. S. ;

Dubisher, R. D. ;

Wurts, D. W. ;

Hund, R. A. ;

Kuhns, R. M. ;

Linn, T. M. ;

Wood, J. L. ;

May, A. J. ;

Dworkin, J. P. ;

Beshore, E. ;

Lauretta, D. S. .

SPACE SCIENCE REVIEWS, 2018, 214 (07)

[10]

Bierhaus E.B., 2019, EPSCDPS2019-1134

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