Stellar origin of the 182 Hf cosmochronometer and the presolar history of solar system matter

Author:

Lugaro Maria1,Heger Alexander123,Osrin Dean1,Goriely Stephane4,Zuber Kai5,Karakas Amanda I.67,Gibson Brad K.8910,Doherty Carolyn L.1,Lattanzio John C.1,Ott Ulrich11

Affiliation:

1. Monash Centre for Astrophysics (MoCA), Monash University, Clayton VIC 3800, Australia.

2. Joint Institute for Nuclear Astrophysics (JINA), 225 Nieuwland Science Hall, Department of Physics, University of Notre Dame, Notre Dame, IN 46556-5670, USA.

3. School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.

4. Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, CP-226, 1050, Brussels, Belgium.

5. Institut für Kern- und Teilchenphysik, Technische Universität Dresden, 01069 Dresden, Germany.

6. Research School of Astronomy and Astrophysics, Australian National University, Canberra, ACT 2611, Australia.

7. Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, the University of Tokyo, Japan.

8. Jeremiah Horrocks Institute, University of Central Lancashire, Preston, PR1 2HE, UK.

9. Institute for Computational Astrophysics, Department of Astronomy and Physics, Saint Mary’s University, Halifax, NS, BH3 3C3, Canada.

10. UK Network for Bridging Disciplines of Galactic Chemical Evolution (BRIDGCE), www.astro.keele.ac.uk/bridgce, UK.

11. Faculty of Natural Science, University of West Hungary, 9700 Szombathely, Hungary.

Abstract

Relocating a heavy-metal factory We can learn about the solar system's past by measuring heavy radioactive isotopes in meteorites—the extraterrestrial equivalent of carbon dating on Earth. Elements heavier than iron are mainly synthesized in supernovae or asymptotic giant branch (AGB) stars. Knowing exactly which element is produced where, is key to dating the solar system. Lugaro et al. found that AGB stars generated more of a nuclide called 182 Hf than previously thought (see the Perspective by Bizzarro). Its abundance indicates that it was produced about 30 million years before the Sun's formation. Science , this issue p. 650 ; see also p. 620

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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