Solar nebula magnetic fields recorded in the Semarkona meteorite

Fu, R. R. and Weiss, B. P. and Lima, E. A. and Harrison, R. J. and Bai, X.-N. and Desch, S. J. and Ebel, D. S. and Suavet, C. and Wang, H. and Glenn, D. and Le Sage, D. and Kasama, T. and Walsworth, R. L. and Kuan, A. T. (2014) Solar nebula magnetic fields recorded in the Semarkona meteorite. Science, 346 (6213). pp. 1089-1092. ISSN 0036-8075 DOI 10.1126/science.1258022

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Official URL: http://dx.doi.org/10.1126/science.1258022

Abstract

Magnetic fields are proposed to have played a critical role in some of the most enigmatic processes of planetary formation by mediating the rapid accretion of disk material onto the central star and the formation of the first solids. However, there have been no experimental constraints on the intensity of these fields. Here we show that dusty olivine-bearing chondrules from the Semarkona meteorite were magnetized in a nebular field of 54 ± 21 microteslas. This intensity supports chondrule formation by nebular shocks or planetesimal collisions rather than by electric currents, the x-wind, or other mechanisms near the Sun. This implies that background magnetic fields in the terrestrial planet-forming region were likely 5 to 54 microteslas, which is sufficient to account for measured rates of mass and angular momentum transport in protoplanetary disks.

Item Type: Article
Uncontrolled Keywords: 2014AREP; IA68;
Subjects: 03 - Mineral Sciences
Divisions: 03 - Mineral Sciences
Journal or Publication Title: Science
Volume: 346
Page Range: pp. 1089-1092
Identification Number: 10.1126/science.1258022
Depositing User: Sarah Humbert
Date Deposited: 23 Dec 2014 13:18
Last Modified: 22 Jan 2015 17:42
URI: http://eprints.esc.cam.ac.uk/id/eprint/3188

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