Other
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712803v&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #128.03; Bulletin of the American Astronomical Society, Vol. 33, p.711
Other
Scientific paper
According to the hypothesis of the triggered origin of the solar system, the formation of our planetary system was initiated by the impact of an interstellar shock wave on a molecular cloud core. The shock wave originated from a nearby explosive stellar event and carried with it nucleosynthesis products from the stellar source. In addition to causing the molecular cloud core to collapse earlier than it would have otherwise, the shock wave also deposited some of the freshly synthesized nuclides into the collapsing system. These short-lived radioactivities were then incorporated into the first solar system solids, in this manner leaving a record of the event in the meteoritic material. The viability of the hypothesis can be examined through numerical calculations investigating the processes involved in the interaction between the shock wave and the core. New high-resolution calculations show that material carried by the shock wave can be injected into the collapsing system through Rayleigh-Taylor instabilities developing at the surface of the compressed core. Injection begins shortly after the central density of the core has started to grow due to the shock wave transmitted from the compressed outer regions of the core and proceeds for a few x 100,000 yr. The injection efficiency is approximately 10%, and the fraction of injected material is of the order 1% of the total mass contained in the central parts of the collapsing core. The timescale of triggered collapse, ~100,000 yr, is sufficiently short for the radioactivities to have survived in the measured amounts. The calculations also indicate that temporal and spatial heterogeneities in the abundances of the radioactivities in the early solar system are possible.
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