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Updated: Feb 9, 2026
09:44
Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
Published on: June 5, 2014
13.4K
Multiple generations of grain aggregation in different environments preceded solar system body formation
Hope A Ishii1, John P Bradley2, Hans A Bechtel3
1Hawai'i Institute of Geophysics and Planetology, University of Hawai'i at Manoa, Honolulu, HI 96822; hope.ishii@hawaii.edu.
Summary
Presolar dust, known as GEMS (glass with embedded metal and sulfides), contains organic carbon, indicating formation in cold interstellar clouds, not the hot solar nebula. This finding impacts our understanding of solar system origins.
Area of Science:
- * Astrochemistry
- * Planetary Science
- * Cosmochemistry
Background:
- * The solar system originated from interstellar dust and gas.
- * Presolar dust, crucial for understanding solar system formation, is rare and often altered.
- * Interplanetary dust particles (IDPs) of cometary origin are key repositories of presolar material.
Purpose of the Study:
- * To investigate the composition of GEMS (glass with embedded metal and sulfides) within IDPs.
- * To determine the formation environment of GEMS and their role in early solar system aggregation.
- * To test the hypothesis that GEMS are interstellar dust preserved in cometary IDPs.
Main Methods:
- * High-resolution nanoscale mapping of IDP compositions.
- * Analysis of GEMS grain structure and associated materials.
- * Thermal decomposition analysis of organic carbon components.
Main Results:
- * GEMS grains within IDPs contain significant amounts of organic carbon.
- * Two distinct generations of grain aggregation, mediated by carbon, were identified.
- * The presence of thermally sensitive organic carbon indicates GEMS formed in cold environments (<450 K).
Conclusions:
- * GEMS are not carbon-free and are not products of high-temperature condensation in the solar nebula.
- * The findings support GEMS as surviving interstellar dust formed in presolar molecular clouds or the outer protoplanetary disk.
- * Carbon-mediated aggregation is a critical process in the growth of dust to planetesimals.
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