A radio-detected type Ia supernova with helium-rich circumstellar material

DOI DOI PDF Web Site PubMed 研究データあり 参考文献143件 オープンアクセス

書誌事項

公開日
2023-05-17
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0
  • https://creativecommons.org/licenses/by/4.0
DOI
  • 10.1038/s41586-023-05916-w
  • 10.48550/arxiv.2210.07725
公開者
Springer Science and Business Media LLC

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説明

<jats:title>Abstract</jats:title><jats:p>Type Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf stars destabilized by mass accretion from a companion star<jats:sup>1</jats:sup>, but the nature of their progenitors remains poorly understood. A way to discriminate between progenitor systems is through radio observations; a non-degenerate companion star is expected to lose material through winds<jats:sup>2</jats:sup> or binary interaction<jats:sup>3</jats:sup> before explosion, and the supernova ejecta crashing into this nearby circumstellar material should result in radio synchrotron emission. However, despite extensive efforts, no type Ia supernova (SN Ia) has ever been detected at radio wavelengths, which suggests a clean environment and a companion star that is itself a degenerate white dwarf star<jats:sup>4,5</jats:sup>. Here we report on the study of SN 2020eyj, a SN Ia showing helium-rich circumstellar material, as demonstrated by its spectral features, infrared emission and, for the first time in a SN Ia to our knowledge, a radio counterpart. On the basis of our modelling, we conclude that the circumstellar material probably originates from a single-degenerate binary system in which a white dwarf accretes material from a helium donor star, an often proposed formation channel for SNe Ia (refs. <jats:sup>6,7</jats:sup>). We describe how comprehensive radio follow-up of SN 2020eyj-like SNe Ia can improve the constraints on their progenitor systems.</jats:p>

収録刊行物

  • Nature

    Nature 617 (7961), 477-482, 2023-05-17

    Springer Science and Business Media LLC

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