A radio-detected thermonuclear supernova from a single-degenerate progenitor with a helium star donor

分类： 天文学 >> 天文学 提交时间： 2023-02-19

Erik C. Kool Joel Johansson Jesper Sollerman Javier Moldón Takashi J. Moriya Steve Schulze Laura Chomiuk Chelsea Harris Miguel Pérez-Torres Seppo Mattila Peter Lundqvist Matthew Graham Sheng Yang Daniel A. Perley Nora Linn Strotjohann Christoffer Fremling Avishay Gal-Yam Jeremy Lezmy Kate Maguire Conor Omand

摘要： Type Ia supernovae are thought to be carbon-oxygen white dwarf stars that explode after accreting material from a companion star, but despite extensive studies the nature of the companion star is still poorly understood, as is the explosion mechanism. In the single degenerate scenario, the companion is a non-degenerate star that loses material through winds and/or binary interaction, and a few Type Ia supernovae have shown evidence for hydrogen-rich circumstellar material. We present here the study of SN 2020eyj, a unique Type Ia supernova showing delayed interaction with helium-rich, but hydrogen-poor, circumstellar material. This material surrounding SN 2020eyj is revealed by its unusual light curve and infrared emission, narrow helium emission lines and, for the first time ever in a Type Ia supernova, also a radio counterpart. The circumstellar material likely originates from the companion star, providing the first direct evidence for a, so far hypothesized, single degenerate progenitor system composed of a white dwarf and a helium donor star.

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