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Evidence from stable isotopes and 10Be for solar system formation triggered by a low-mass supernova
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Evidence from stable isotopes and 10Be for solar system formation triggered by a low-mass supernova
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Journal Article
Evidence from stable isotopes and 10Be for solar system formation triggered by a low-mass supernova
2016
Overview
About 4.6 billion years ago, some event disturbed a cloud of gas and dust, triggering the gravitational collapse that led to the formation of the solar system. A core-collapse supernova, whose shock wave is capable of compressing such a cloud, is an obvious candidate for the initiating event. This hypothesis can be tested because supernovae also produce telltale patterns of short-lived radionuclides, which would be preserved today as isotopic anomalies. Previous studies of the forensic evidence have been inconclusive, finding a pattern of isotopes differing from that produced in conventional supernova models. Here we argue that these difficulties either do not arise or are mitigated if the initiating supernova was a special type, low in mass and explosion energy. Key to our conclusion is the demonstration that short-lived
10
Be can be readily synthesized in such supernovae by neutrino interactions, while anomalies in stable isotopes are suppressed.
One hypothesis for solar system formation is gas compression by a nearby supernova, whose traces should be found in isotopic anomalies. Here the authors show that this mechanism is viable only if the triggering event was a low-mass supernova, looking at short-lived 10Be and lack of anomalies in stable isotopes.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
Subject
