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A radio-detected type Ia supernova with helium-rich circumstellar material
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0002-7252-3877
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Stockholm University, Faculty of Science, Department of Astronomy.ORCID iD: 0000-0001-5975-290x
Stockholm University, Faculty of Science, Department of Astronomy. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0003-1546-6615
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Number of Authors: 372023 (English)In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 617, no 7961, p. 477-482Article in journal (Refereed) Published
Abstract [en]

Type Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf stars destabilized by mass accretion from a companion star1, 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 winds2 or binary interaction3 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 star4,5. 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. 6,7). We describe how comprehensive radio follow-up of SN 2020eyj-like SNe Ia can improve the constraints on their progenitor systems.

Place, publisher, year, edition, pages
2023. Vol. 617, no 7961, p. 477-482
National Category
Astronomy, Astrophysics and Cosmology
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URN: urn:nbn:se:su:diva-223960DOI: 10.1038/s41586-023-05916-wISI: 001078324200011PubMedID: 37198310Scopus ID: 2-s2.0-85159611552OAI: oai:DiVA.org:su-223960DiVA, id: diva2:1814445
Available from: 2023-11-24 Created: 2023-11-24 Last updated: 2023-11-24Bibliographically approved

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Kool, Erik C.Pearson Johansson, JoelSollerman, JesperSchulze, SteveLundqvist, PeterYang, ShengOmand, Conor M. B.

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Kool, Erik C.Pearson Johansson, JoelSollerman, JesperMoldón, JavierMoriya, Takashi J.Schulze, StevePérez-Torres, MiguelLundqvist, PeterYang, ShengOmand, Conor M. B.Bellm, Eric C.Robert, EstelleRyder, Stuart D.Sharma, Yashvi
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)Department of Physics
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