Journal
NATURE ASTRONOMY
Volume 3, Issue 4, Pages 326-331Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41550-019-0696-0
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Funding
- Science and Technology Facilities Council (STFC), UK [ST/M001253/1, ST/J001643/1]
- (STFC), UK [PPA/S/S/2005/04117]
- STFC [ST/M001253/1, ST/R000751/1] Funding Source: UKRI
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Many newly formed Sun-like stars show evidence of debris disks composed of dust generated through destructive collisions among residual planetesimals. These are inferred to survive at a detectable level over the first similar to 100 Myr of their parent star's lifetime. We hypothesize that the most primitive meteorites were processed as a result of impacts as our Solar System's debris disk dissipated, rather than as a result of heat generated by decay of Al-26. We show how the iodine-xenon (I-Xe) record from chondrules in the Chainpur meteorite supports this hypothesis, and use it to constrain the decline in the impact rate. We demonstrate that it is the creation of I-Xe sites during compaction that is recorded by the chondrule dataset. We show that, to account for the broader I-Xe record from primitive material, a consistent picture requires that the dissipation of our Solar System's debris disk had a timescale of around 40-50 Myr in this period. Against this backdrop, the late addition of siderophiles to the Earth in a single large impact may represent a rare phenomenon in planetary system formation that has been anthropically selected.
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