Kool, Erik C. and Johansson, Joel and Sollerman, Jesper and Moldón, Javier and Moriya, Takashi J. and Mattila, Seppo and Schulze, Steve and Chomiuk, Laura and Pérez-Torres, Miguel and Harris, Chelsea and Lundqvist, Peter and Graham, Matthew and Yang, Sheng and Perley, Daniel A. and Strotjohann, Nora Linn and Fremling, Christoffer and Gal-Yam, Avishay and Lezmy, Jeremy and Maguire, Kate and Omand, Conor and Smith, Mathew and Andreoni, Igor and Bellm, Eric C. and Bloom, Joshua S. and De, Kishalay and Groom, Steven L. and Kasliwal, Mansi M. and Masci, Frank J. and Medford, Michael S. and Park, Sungmin and Purdum, Josiah and Reynolds, Thomas M. and Riddle, Reed and Robert, Estelle and Ryder, Stuart D. and Sharma, Yashvi and Stern, Daniel (2023) A radio-detected type Ia supernova with helium-rich circumstellar material. Nature, 617 (7961). pp. 477-482. ISSN 0028-0836
Full text not available from this repository.Abstract
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....