182Hf-182W age dating of a 26Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System

Jesper Christian Holst; Mia Bjørg Stolberg Olsen; Chad Paton; Kazuhide Nagashima; Martin Schiller; Daniel Kim Peel Wielandt; Kirsten Kolbjørn Larsen; James Connelly; Jes Kristian Jørgensen; Alexander N. Krot; Åke Nordlund; Martin Bizzarro

doi:10.1073/pnas.1300383110

¹⁸²Hf-¹⁸²W age dating of a ²⁶Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System

Jesper Christian Holst, Mia Bjørg Stolberg Olsen, Chad Paton, Kazuhide Nagashima, Martin Schiller, Daniel Kim Peel Wielandt, Kirsten Kolbjørn Larsen, James Connelly, Jes Kristian Jørgensen, Alexander N. Krot, Åke Nordlund, Martin Bizzarro

Astrophysics and Planetary Science

47 Citations (Scopus)

Abstract

Refractory inclusions [calcium-aluminum-rich inclusions, (CAIs)] represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. CAIs contain evidence of now extinct short-lived radioisotopes (e.g., ²⁶Al, ⁴¹Ca, and ¹⁸²Hf) synthesized in one or multiple stars and added to the protosolar molecular cloud before or during its collapse. Understanding how and when short-lived radioisotopes were added to the Solar System is necessary to assess their validity as chronometers and constrain the birthplace of the Sun. Whereas most CAIs formed with the canonical abundance of ²⁶Al corresponding to ²⁶Al/²⁷Al of ̃ 5 × 10 ^-5, rare CAIs with fractionation and unidentified nuclear isotope effects (FUN CAIs) record nucleosynthetic isotopic heterogeneity and ²⁶Al/²⁷Al of >5 × 10-6, possibly reflecting their formation before canonical CAIs. Thus, FUN CAIs may provide a unique window into the earliest Solar System, including the origin of short-lived radioisotopes. However, their chronology is unknown. Using the ¹⁸²Hf-¹⁸²W chronometer, we show that a FUN CAI recording a condensation origin from a solar gas formed coevally with canonical CAIs, but with 26Al/27Al of ̃3 × 10^-6. The decoupling between ¹⁸²Hf and 26Al requires distinct stellar origins: steady-state galactic stellar nucleosynthesis for ¹⁸²Hf and late-stage contamination of the protosolar molecular cloud by a massive star(s) for ²⁶Al. Admixing of stellar-derived ²⁶Al to the protoplanetary disk occurred during the epoch of CAI formation and, therefore, the ²⁶Al-²⁶Mg systematics of CAIs cannot be used to define their formation interval. In contrast, our results support 182Hf homogeneity and chronological significance of the ¹⁸²Hf-¹⁸²W clock.

Original language	English
Journal	Proceedings of the National Academy of Science of the United States of America
Volume	110
Issue number	22
Pages (from-to)	8819-8823
Number of pages	5
ISSN	0027-8424
DOIs	https://doi.org/10.1073/pnas.1300383110
Publication status	Published - 28 May 2013

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Holst, J. C., Olsen, M. B. S., Paton, C., Nagashima, K., Schiller, M., Wielandt, D. K. P., Larsen, K. K., Connelly, J., Jørgensen, J. K., Krot, A. N., Nordlund, Å., & Bizzarro, M. (2013). ¹⁸²Hf-¹⁸²W age dating of a ²⁶Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System. Proceedings of the National Academy of Science of the United States of America, 110(22), 8819-8823. https://doi.org/10.1073/pnas.1300383110

¹⁸²Hf-¹⁸²W age dating of a ²⁶Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System. / Holst, Jesper Christian; Olsen, Mia Bjørg Stolberg; Paton, Chad et al.
In: Proceedings of the National Academy of Science of the United States of America, Vol. 110, No. 22, 28.05.2013, p. 8819-8823.

Research output: Contribution to journal › Journal article › Research › peer-review

Holst, JC, Olsen, MBS, Paton, C, Nagashima, K, Schiller, M , Wielandt, DKP, Larsen, KK, Connelly, J , Jørgensen, JK, Krot, AN, Nordlund, Å & Bizzarro, M 2013, '¹⁸²Hf-¹⁸²W age dating of a ²⁶Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System', Proceedings of the National Academy of Science of the United States of America, vol. 110, no. 22, pp. 8819-8823. https://doi.org/10.1073/pnas.1300383110

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title = "182Hf-182W age dating of a 26Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System",

abstract = "Refractory inclusions [calcium-aluminum-rich inclusions, (CAIs)] represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. CAIs contain evidence of now extinct short-lived radioisotopes (e.g., 26Al, 41Ca, and 182Hf) synthesized in one or multiple stars and added to the protosolar molecular cloud before or during its collapse. Understanding how and when short-lived radioisotopes were added to the Solar System is necessary to assess their validity as chronometers and constrain the birthplace of the Sun. Whereas most CAIs formed with the canonical abundance of 26Al corresponding to 26Al/27Al of{\~ } 5 × 10 -5, rare CAIs with fractionation and unidentified nuclear isotope effects (FUN CAIs) record nucleosynthetic isotopic heterogeneity and 26Al/27Al of >5 × 10-6, possibly reflecting their formation before canonical CAIs. Thus, FUN CAIs may provide a unique window into the earliest Solar System, including the origin of short-lived radioisotopes. However, their chronology is unknown. Using the 182Hf-182W chronometer, we show that a FUN CAI recording a condensation origin from a solar gas formed coevally with canonical CAIs, but with 26Al/27Al of{\~ }3 × 10-6. The decoupling between 182Hf and 26Al requires distinct stellar origins: steady-state galactic stellar nucleosynthesis for 182Hf and late-stage contamination of the protosolar molecular cloud by a massive star(s) for 26Al. Admixing of stellar-derived 26Al to the protoplanetary disk occurred during the epoch of CAI formation and, therefore, the 26Al-26Mg systematics of CAIs cannot be used to define their formation interval. In contrast, our results support 182Hf homogeneity and chronological significance of the 182Hf-182W clock.",

author = "Holst, {Jesper Christian} and Olsen, {Mia Bj{\o}rg Stolberg} and Chad Paton and Kazuhide Nagashima and Martin Schiller and Wielandt, {Daniel Kim Peel} and Larsen, {Kirsten Kolbj{\o}rn} and James Connelly and J{\o}rgensen, {Jes Kristian} and Krot, {Alexander N.} and {\AA}ke Nordlund and Martin Bizzarro",

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T1 - 182Hf-182W age dating of a 26Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System

AU - Holst, Jesper Christian

AU - Olsen, Mia Bjørg Stolberg

AU - Paton, Chad

AU - Nagashima, Kazuhide

AU - Schiller, Martin

AU - Wielandt, Daniel Kim Peel

AU - Larsen, Kirsten Kolbjørn

AU - Connelly, James

AU - Jørgensen, Jes Kristian

AU - Krot, Alexander N.

AU - Nordlund, Åke

AU - Bizzarro, Martin

PY - 2013/5/28

Y1 - 2013/5/28

N2 - Refractory inclusions [calcium-aluminum-rich inclusions, (CAIs)] represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. CAIs contain evidence of now extinct short-lived radioisotopes (e.g., 26Al, 41Ca, and 182Hf) synthesized in one or multiple stars and added to the protosolar molecular cloud before or during its collapse. Understanding how and when short-lived radioisotopes were added to the Solar System is necessary to assess their validity as chronometers and constrain the birthplace of the Sun. Whereas most CAIs formed with the canonical abundance of 26Al corresponding to 26Al/27Al of ̃ 5 × 10 -5, rare CAIs with fractionation and unidentified nuclear isotope effects (FUN CAIs) record nucleosynthetic isotopic heterogeneity and 26Al/27Al of >5 × 10-6, possibly reflecting their formation before canonical CAIs. Thus, FUN CAIs may provide a unique window into the earliest Solar System, including the origin of short-lived radioisotopes. However, their chronology is unknown. Using the 182Hf-182W chronometer, we show that a FUN CAI recording a condensation origin from a solar gas formed coevally with canonical CAIs, but with 26Al/27Al of ̃3 × 10-6. The decoupling between 182Hf and 26Al requires distinct stellar origins: steady-state galactic stellar nucleosynthesis for 182Hf and late-stage contamination of the protosolar molecular cloud by a massive star(s) for 26Al. Admixing of stellar-derived 26Al to the protoplanetary disk occurred during the epoch of CAI formation and, therefore, the 26Al-26Mg systematics of CAIs cannot be used to define their formation interval. In contrast, our results support 182Hf homogeneity and chronological significance of the 182Hf-182W clock.

AB - Refractory inclusions [calcium-aluminum-rich inclusions, (CAIs)] represent the oldest Solar System solids and provide information regarding the formation of the Sun and its protoplanetary disk. CAIs contain evidence of now extinct short-lived radioisotopes (e.g., 26Al, 41Ca, and 182Hf) synthesized in one or multiple stars and added to the protosolar molecular cloud before or during its collapse. Understanding how and when short-lived radioisotopes were added to the Solar System is necessary to assess their validity as chronometers and constrain the birthplace of the Sun. Whereas most CAIs formed with the canonical abundance of 26Al corresponding to 26Al/27Al of ̃ 5 × 10 -5, rare CAIs with fractionation and unidentified nuclear isotope effects (FUN CAIs) record nucleosynthetic isotopic heterogeneity and 26Al/27Al of >5 × 10-6, possibly reflecting their formation before canonical CAIs. Thus, FUN CAIs may provide a unique window into the earliest Solar System, including the origin of short-lived radioisotopes. However, their chronology is unknown. Using the 182Hf-182W chronometer, we show that a FUN CAI recording a condensation origin from a solar gas formed coevally with canonical CAIs, but with 26Al/27Al of ̃3 × 10-6. The decoupling between 182Hf and 26Al requires distinct stellar origins: steady-state galactic stellar nucleosynthesis for 182Hf and late-stage contamination of the protosolar molecular cloud by a massive star(s) for 26Al. Admixing of stellar-derived 26Al to the protoplanetary disk occurred during the epoch of CAI formation and, therefore, the 26Al-26Mg systematics of CAIs cannot be used to define their formation interval. In contrast, our results support 182Hf homogeneity and chronological significance of the 182Hf-182W clock.

U2 - 10.1073/pnas.1300383110

DO - 10.1073/pnas.1300383110

M3 - Journal article

SN - 0027-8424

VL - 110

SP - 8819

EP - 8823

JO - Proceedings of the National Academy of Science of the United States of America

JF - Proceedings of the National Academy of Science of the United States of America

IS - 22

ER -

182Hf-182W age dating of a 26Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System

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¹⁸²Hf-¹⁸²W age dating of a ²⁶Al-poor inclusion and implications for the origin of short-lived radioisotopes in the early Solar System