The Timing of Potential Last Nucleosynthetic Injections into the Protosolar Molecular Cloud Inferred from 41Ca–26Al Systematics of Bulk CAIs

Ku, Yaray; Petaev, Michail I.; Jacobsen, Stein B.

doi:10.3847/2041-8213/ac666a

Title: The Timing of Potential Last Nucleosynthetic Injections into the Protosolar Molecular Cloud Inferred from ⁴¹Ca–²⁶Al Systematics of Bulk CAIs

Journal Article · Mon May 23 00:00:00 EDT 2022 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.3847/2041-8213/ac666a· OSTI ID:1981274

^[1]; Petaev, Michail I. ^[1];

^[1]

Harvard University, Cambridge, MA (United States)

Short-lived radionuclides (SLRs) provide important information about the chronology of the early solar system. Among them, ⁴¹Ca, due to its decay to ⁴¹K with a half-life of only 0.1 Ma, is particularly valuable in constraining the timescales and origins of both SLRs and the formation of the oldest solar system materials, the Ca–Al-rich inclusions (CAIs). The initial abundance of 41Ca in the solar system, expressed as the (⁴¹Ca/⁴⁰Ca)I ratio, is the key to unveiling the origin of this nuclide. Here, we report a new solar system (⁴¹Ca/⁴⁰Ca)I ratio of 2.0 × 10⁻⁸ derived from the K isotope compositions of two CAIs. This new ratio is about four times higher than the previous value inferred from a mineral isochron. Such a high (⁴¹Ca/⁴⁰Ca)I ratio in the CAIs exceeds that expected for the protosolar molecular cloud by ∼1000×, implying very late injection of the ⁴¹Ca (and possibly other SLRs) into the protosolar molecular cloud. The correlated enrichments of ⁴¹Ca and ²⁶Al in the bulk CAI samples hint at a common stellar origin of both SLRs. The injection time estimated from our new data depends on the stellar source—it ranges from 0.6 Ma for a Wolf–Rayet wind to 1.0 Ma for a TP-AGB star ejecta.

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Research Organization:: Harvard Univ., Cambridge, MA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: NA0003904; 80NSSC20K0346

OSTI ID:: 1981274

Journal Information:: The Astrophysical Journal. Letters, Vol. 931, Issue 1; ISSN 2041-8205

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Title: The Timing of Potential Last Nucleosynthetic Injections into the Protosolar Molecular Cloud Inferred from 41Ca–26Al Systematics of Bulk CAIs

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Title: The Timing of Potential Last Nucleosynthetic Injections into the Protosolar Molecular Cloud Inferred from ⁴¹Ca–²⁶Al Systematics of Bulk CAIs