Solar nebula magnetic fields recorded in the Semarkona meteorite
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Fu_Solar nebula.pdf
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Author(s)
Fu, Roger Rennan
Weiss, Benjamin P.
Andrade Lima, Eduardo
Harrison, Richard J.
Bai, Xue-Ning
Desch, Steven J.
Ebel, Denton S.
Suavet, Clement Romain
Wang, Huapei
Glenn, David
Date Issued
November 2014
Journal
Science
Publisher
American Association for the Advancement of Science (AAAS)
Citation
Fu, R. R., B. P. Weiss, E. A. Lima, R. J. Harrison, X.-N. Bai, S. J. Desch, D. S. Ebel, et al. “Solar Nebula Magnetic Fields Recorded in the Semarkona Meteorite.” Science (November 13, 2014).
Version
Author's final manuscript
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 μT. 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 5-54 μT, which is sufficient to account for measured rates of mass and angular momentum transport in protoplanetary disks.
MIT Department
Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences
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DOI of Published Version
http://dx.doi.org/10.1126/science.1258022
