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

Kool, EC, Johansson, J, Sollerman, J, Moldón, J, Moriya, TJ, Mattila, S, Schulze, S, Chomiuk, L, Pérez-Torres, M, Harris, C, Lundqvist, P, Graham, M, Yang, S, Perley, DA, Strotjohann, NL, Fremling, C, Gal-Yam, A, Lezmy, J, Maguire, K, Omand, C , Smith, M, Andreoni, I, Bellm, EC, Bloom, JS, De, K, Groom, SL, Kasliwal, MM, Masci, FJ, Medford, MS, Park, S, Purdum, J, Reynolds, TM, Riddle, R, Robert, E, Ryder, SD, Sharma, Y and Stern, D (2023) A radio-detected type Ia supernova with helium-rich circumstellar material. Nature, 617 (7961). pp. 477-482. ISSN 0028-0836

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Type Ia supernovae (SNe Ia) are thermonuclear explosions of degenerate white dwarf stars destabilized by mass accretion from a companion star 1, 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 2 or binary interaction 3 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 4,5. 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.

Item Type: Article
Uncontrolled Keywords: General Science & Technology
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Nature Publishing Group
SWORD Depositor: A Symplectic
Date Deposited: 21 Jun 2023 09:35
Last Modified: 21 Jun 2023 09:45
DOI or ID number: 10.1038/s41586-023-05916-w
URI: https://researchonline.ljmu.ac.uk/id/eprint/19964
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