Evidence for supernova injection into the solar nebula and the decoupling of r-process nucleosynthesis

Gregory A. Brennecka, Lars E. Borg, Meenakshi Wadhwa

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The isotopic composition of our Solar System reflects the blending of materials derived from numerous past nucleosynthetic events, each characterized by a distinct isotopic signature. We show that the isotopic compositions of elements spanning a large mass range in the earliest formed solids in our Solar System, calcium-aluminum- rich inclusions (CAIs), are uniform, and yet distinct from the average Solar System composition. Relative to younger objects in the Solar System, CAIs contain positive r-process anomalies in isotopes A < 140 and negative r-process anomalies in isotopes A > 140. This fundamental difference in the isotopic character of CAIs around mass 140 necessitates (i) the existence of multiple sources for r-process nucleosynthesis and (ii) the injection of supernova material into a reservoir untapped by CAIs. A scenario of late supernova injection into the protoplanetary disk is consistent with formation of our Solar System in an active star-forming region of the galaxy.

Original languageEnglish (US)
Pages (from-to)17241-17246
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume110
Issue number43
DOIs
Publication statusPublished - Oct 22 2013

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Keywords

  • Early Solar System
  • H-Event
  • Isotopic anomalies
  • Nebular disk

ASJC Scopus subject areas

  • General

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