Triggered Star Formation inside the Shell of a Wolf-Rayet Bubble as the Origin of the Solar System

Vikram V. Dwarkadas, Nicolas Dauphas, Bradley Meyer, Peter Boyajian, Michael Bojazi, Bruce G. Elmegreen, L. Viktor Tóth, Manuel Güdel

Research output: Contribution to journalArticle


A constraint on Solar System formation is the high 26Al/27Al abundance ratio, 17 times higher than the average Galactic ratio, while the 60Fe/56Fe value was lower than the Galactic value. This challenges the assumption that a nearby supernova was responsible for the injection of these short-lived radionuclides into the early Solar System. We suggest that the Solar System was formed by triggered star formation at the edge of a Wolf-Rayet (W-R) bubble. We discuss the details of various processes within the model using numerical simulations, and analytic and semi-analytic calculations, and conclude that it is a viable model that can explain the initial abundances of 26Al and 60Fe. We estimate that 1%-16% of all Sun-like stars could have formed in such a setting.

Original languageEnglish
Pages (from-to)78-82
Number of pages5
JournalProceedings of the International Astronomical Union
Publication statusAccepted/In press - 2019


  • ISM: Bubbles
  • Solar System: Formation
  • methods: Analytical
  • methods: Numerical
  • outflows
  • stars: Mass loss
  • stars: Winds
  • stars: Wolf-Rayet

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

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