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Evidence for enrichment of niobium-92 in the outer protosolar disk
https://repo.qst.go.jp/records/2000287
https://repo.qst.go.jp/records/2000287b3f367b1-89bc-4540-97f7-a71cd9680fba
| アイテムタイプ | 学術雑誌論文 / Journal Article(1) | |||||||||||||
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| 公開日 | 2023-09-04 | |||||||||||||
| タイトル | ||||||||||||||
| タイトル | Evidence for enrichment of niobium-92 in the outer protosolar disk | |||||||||||||
| 言語 | en | |||||||||||||
| 言語 | ||||||||||||||
| 言語 | eng | |||||||||||||
| 資源タイプ | ||||||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||||||
| 資源タイプ | journal article | |||||||||||||
| 著者 |
Yuki Hibiya
× Yuki Hibiya
× Tsuyoshi Iizuka
× Hatsuki Enomoto
× Takehito Hayakawa
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| 抄録 | ||||||||||||||
| 内容記述タイプ | Abstract | |||||||||||||
| 内容記述 | The short-lived radionuclide, niobium-92 has been used to estimate the site of nucleosynthesis for p-nuclei and the timing of planetary differentiation, assuming that it was uniformly distributed in the early solar system. Here, we present the internal niobium-zirconium (Nb?Zr) isochron dating of Northwest Africa (NWA) 6704, an achondrite thought to form in the outer protosolar disk due to nucleosynthetic isotope similarities with carbonaceous chondrites. The isochron defines an initial 92Nb/93Nb ratio of (2.72 ± 0.25) × 10?5 at the NWA 6704 formation, 4562.76 ± 0.30 million years ago. This corresponds to a 92Nb/93 27 Nb ratio of (2.96 ± 0.27) × 10?5 at the time of solar system formation, which is ~ 80% higher than the values obtained from meteorites formed in the inner disk. The results suggest that a significant proportion of the solar 92 30 Nb was produced by a nearby core-collapse supernova (CCSN) and that the outer disk was more enriched in CCSN ejecta, which would account for the heterogeneity of short-lived 26Al and nucleosynthetic stable isotope anomalies across the disk. We propose that NWA 6704 serves as the best anchor for mapping relative Nb?Zr ages of objects in the outer solar system onto the absolute timescale. |
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| 書誌情報 |
The Astrophysical Journal Letters 号 942, p. L15, 発行日 2023-02 |
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| 出版者 | IOP Publishing | |||||||||||||
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| 収録物識別子タイプ | ISSN | |||||||||||||
| 収録物識別子 | 2041-8205 | |||||||||||||
| DOI | ||||||||||||||
| 識別子タイプ | DOI | |||||||||||||
| 関連識別子 | 10.3847/2041-8213/acab5d | |||||||||||||
