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Title: Lifetime of the solar nebula constrained by meteorite paleomagnetism

We present that a key stage in planet formation is the evolution of a gaseous and magnetized solar nebula. However, the lifetime of the nebular magnetic field and nebula are poorly constrained. We present paleomagnetic analyses of volcanic angrites demonstrating that they formed in a near-zero magnetic field (<0.6 microtesla) at 4563.5 ± 0.1 million years ago, ~3.8 million years after solar system formation. This indicates that the solar nebula field, and likely the nebular gas, had dispersed by this time. This sets the time scale for formation of the gas giants and planet migration. Furthermore, it supports formation of chondrules after 4563.5 million years ago by non-nebular processes like planetesimal collisions. In conclusion, the core dynamo on the angrite parent body did not initiate until about 4 to 11 million years after solar system formation.
Authors:
ORCiD logo [1] ;  [1] ; ORCiD logo [2] ;  [1] ;  [3] ;  [3] ; ORCiD logo [1] ;  [1] ; ORCiD logo [4]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Department of Earth, Atmospheric and Planetary Sciences
  2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States). Institute for Theory and Computation
  3. Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source-II
  4. Museu Nacional, Rio de Janeiro (Brazil)
Publication Date:
Report Number(s):
BNL-114086-2017-JA
Journal ID: ISSN 0036-8075
Grant/Contract Number:
SC0012704; AC02-98CH10886; AC02-06CH11357; 284009
Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 355; Journal Issue: 6325; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS
OSTI Identifier:
1458565
Alternate Identifier(s):
OSTI ID: 1376145