Exogenic basalt on asteroid (101955) Bennu

被引：78

作者：

DellaGiustina, D. N. ^{[1
,2
]}

Kaplan, H. H. ^{[3
]}

Simon, A. A. ^{[4
]}

Bottke, W. F. ^{[3
]}

Avdellidou, C. ^{[5
]}

Delbo, M. ^{[5
]}

Ballouz, R. -L. ^{[1
]}

Golish, D. R. ^{[1
]}

Walsh, K. J. ^{[3
]}

Popescu, M. ^{[6
,7
]}

Campins, H. ^{[8
]}

Barucci, M. A. ^{[9
]}

Poggiali, G. ^{[10
]}

Daly, R. T. ^{[11
]}

Le Corre, L. ^{[12
]}

Hamilton, V. E. ^{[3
]}

Porter, N. ^{[1
]}

Jawin, E. R. ^{[13
]}

McCoy, T. J. ^{[13
]}

Connolly, H. C., Jr. ^{[1
,14
]}

Garcia, J. L. Rizos ^{[6
,7
]}

Tatsumi, E. ^{[6
,7
]}

de Leon, J. ^{[6
,7
]}

Licandro, J. ^{[6
,7
]}

Fornasier, S. ^{[9
]}

Daly, M. G. ^{[15
]}

Al Asad, M. M. ^{[16
]}

Philpott, L. ^{[16
]}

Seabrook, J. ^{[15
]}

Barnouin, O. S. ^{[11
]}

Clark, B. E. ^{[17
]}

Nolan, M. C. ^{[1
]}

Howell, E. S. ^{[1
]}

Binzel, R. P. ^{[18
]}

Rizk, B. ^{[1
]}

Reuter, D. C. ^{[4
]}

Lauretta, D. S. ^{[1
]}

机构：

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

[2] Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA

[3] Southwest Res Inst, Boulder, CO 80302 USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD USA

[5] Univ Cote Azur, Observ Cote Azur, CNRS, Lab Lagrange, Nice, France

[6] Univ La Laguna, Inst Astrofis Canarias, Tenerife, Spain

[7] Univ La Laguna, Dept Astrofis, Tenerife, Spain

[8] Univ Cent Florida, Dept Phys, Orlando, FL USA

[9] Sorbonne Univ, Univ Paris, Univ PSL, CNRS,LESIA,Observ Paris, Meudon, France

[10] Osserv Astrofis Arcetri, INAF, Florence, Italy

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

[12] Planetary Sci Inst, Tucson, AZ USA

[13] Smithsonian Inst, Natl Museum Nat Hist, Washington, DC 20560 USA

[14] Rowan Univ, Dept Geol, Glassboro, NJ USA

[15] York Univ, Ctr Res Earth & Space Sci, Toronto, ON, Canada

[16] Univ British Columbia, Dept Earth Ocean & Atmospher Sci, Vancouver, BC, Canada

[17] Ithaca Coll, Dept Phys & Astron, Ithaca, NY 14850 USA

[18] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA USA

来源：

NATURE ASTRONOMY | 2021年 / 5卷 / 01期

关键词：

HYPERVELOCITY COLLISIONS; DARK MATERIAL; PARENT BODY; OSIRIS-REX; VESTA; PYROXENE; IMPACTS; HISTORY; ORIGIN; EVOLUTION;

D O I：

10.1038/s41550-020-1195-z

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Six bright boulders of exotic material on near-Earth asteroid (101955) Bennu stand out from the average asteroidal surface. This unexpected record of impactors offers clues to the formation history of Bennu. When rubble-pile asteroid 2008 TC(3)impacted Earth on 7 October 2008, the recovered rock fragments indicated that such asteroids can contain exogenic material(1,2). However, spacecraft missions to date have only observed exogenous contamination on large, monolithic asteroids that are impervious to collisional disruption(3,4). Here, we report the presence of metre-scale exogenic boulders on the surface of near-Earth asteroid (101955) Bennu-the 0.5-km-diameter, rubble-pile target of the OSIRIS-REx mission(5)that has been spectroscopically linked to the CM carbonaceous chondrite meteorites(6). Hyperspectral data indicate that the exogenic boulders have the same distinctive pyroxene composition as the howardite-eucrite-diogenite (HED) meteorites that come from (4) Vesta, a 525-km-diameter asteroid that has undergone differentiation and extensive igneous processing(7-9). Delivery scenarios include the infall of Vesta fragments directly onto Bennu or indirectly onto Bennu's parent body, where the latter's disruption created Bennu from a mixture of endogenous and exogenic debris. Our findings demonstrate that rubble-pile asteroids can preserve evidence of inter-asteroid mixing that took place at macroscopic scales well after planetesimal formation ended. Accordingly, the presence of HED-like material on the surface of Bennu provides previously unrecognized constraints on the collisional and dynamical evolution of the inner main belt.

引用

页码：31 / 38

页数：9

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