Dark material on Vesta from the infall of carbonaceous volatile-rich material

被引：144

作者：

McCord, T. B. ^{[1
]}

Li, J. -Y. ^{[2
]}

Combe, J. -P. ^{[1
]}

McSween, H. Y. ^{[3
]}

Jaumann, R. ^{[4
]}

Reddy, V. ^{[5
,6
]}

Tosi, F. ^{[7
]}

Williams, D. A. ^{[8
]}

Blewett, D. T. ^{[9
]}

Turrini, D. ^{[7
]}

Palomba, E. ^{[7
]}

Pieters, C. M. ^{[10
]}

De Sanctis, M. C. ^{[7
]}

Ammannito, E. ^{[7
]}

Capria, M. T. ^{[7
]}

Le Corre, L. ^{[5
]}

Longobardo, A. ^{[7
]}

Nathues, A. ^{[5
]}

Mittlefehldt, D. W. ^{[11
]}

Schroeder, S. E. ^{[5
]}

Hiesinger, H. ^{[12
]}

Beck, A. W. ^{[13
]}

Capaccioni, F. ^{[7
]}

Carsenty, U. ^{[4
]}

Keller, H. U. ^{[14
]}

Denevi, B. W. ^{[9
]}

Sunshine, J. M. ^{[15
]}

Raymond, C. A. ^{[16
]}

Russell, C. T. ^{[17
]}

机构：

[1] Bear Fight Inst, Winthrop, WA 98862 USA

[2] Planetary Sci Inst, Tucson, AZ 85719 USA

[3] Univ Tennessee, Knoxville, TN 37996 USA

[4] Inst Planetary Res, DLR, D-80302 Berlin, Germany

[5] Max Planck Inst Solar Syst Res, D-37191 Katlenburg, Germany

[6] Univ N Dakota, Grand Forks, ND 58202 USA

[7] Ist Nazl Astrofis IASF, I-00133 Rome, Italy

[8] Arizona State Univ, Tempe, AZ 85287 USA

[9] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA

[10] Brown Univ, Providence, RI 02912 USA

[11] NASA, Lyndon B Johnson Space Ctr, Astromat Res Off, Houston, TX 77058 USA

[12] Univ Munster, Inst Planetol, D-48149 Munster, Germany

[13] Smithsonian Natl Museum Nat Hist, Dept Mineral Sci, Washington, DC 20024 USA

[14] Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany

[15] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[16] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[17] Univ Calif Los Angeles, Los Angeles, CA 90095 USA

来源：

NATURE | 2012年 / 491卷 / 7422期

关键词：

DAWN; HETEROGENEITY; MINERALOGY; SURFACE; ALBEDO; COLOR;

D O I：

10.1038/nature11561

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Localized dark and bright materials, often with extremely different albedos, were recently found on Vesta's surface(1,2). The range of albedos is among the largest observed on Solar System rocky bodies. These dark materials, often associated with craters, appear in ejecta and crater walls, and their pyroxene absorption strengths are correlated with material brightness. It was tentatively suggested that the dark material on Vesta could be either exogenic, from carbon-rich, low-velocity impactors, or endogenic, from freshly exposed mafic material or impact melt, created or exposed by impacts. Here we report Vesta spectra and images and use them to derive and interpret the properties of the 'pure' dark and bright materials. We argue that the dark material is mainly from infall of hydrated carbonaceous material (like that found in a major class of meteorites and some comet surfaces(3-5)), whereas the bright material is the uncontaminated indigenous Vesta basaltic soil. Dark material from low-albedo impactors is diffused over time through the Vestan regolith by impact mixing, creating broader, diffuse darker regions and finally Vesta's background surface material. This is consistent with howardite-eucrite-diogenite meteorites coming from Vesta.

引用

页码：83 / U93

页数：4

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