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A runaway Wolf-Rayet star as the origin of 26-Al in the early solar system

Abstract : Establishing the origin of the short-lived radionuclide (SLR) 26-Al, which was present in refractory inclusions in primitive meteorites, has profound implications for the astrophysical context of solar system formation. Recent observations that 26-Al was homogeneously distributed in the inner solar system prove that this SLR has a stellar origin. In this Letter, we address the issue of the incorporation of hot 26-Al-rich stellar ejecta into the cold protosolar nebula. We first show that the 26-Al atoms produced by a population of massive stars in an OB association cannot be injected into protostellar cores with enough efficiency. We then show that this SLR likely originated in a Wolf-Rayet star that escaped from its parent cluster and interacted with a neighboring molecular cloud. The explosion of this runaway star as a supernova probably triggered the formation of the solar system. This scenario also accounts for the meteoritic abundance of 41-Ca.
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Contributor : Sophie Heurteau <>
Submitted on : Wednesday, May 5, 2010 - 4:55:26 PM
Last modification on : Thursday, December 10, 2020 - 8:38:02 AM

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V. Tatischeff, J. Duprat, N. de Sereville. A runaway Wolf-Rayet star as the origin of 26-Al in the early solar system. The Astrophysical journal letters, Bristol : IOP Publishing, 2010, 714, pp.L26-L30. ⟨10.1088/2041-8205/714/1/L26⟩. ⟨in2p3-00481014⟩



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