A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor

Pelisoli I, Neunteufel P, Geier S, Kupfer T, Heber U, Irrgang A, Schneider D, Bastian A, Van Roestel J, Schaffenroth , Barlow BN (2021)

Publication Type: Journal article

Publication year: 2021


DOI: 10.1038/s41550-021-01413-0


Supernovae Ia are bright explosive events that can be used to estimate cosmological distances, allowing us to study the expansion of the Universe. They are understood to result from a thermonuclear detonation in a white dwarf that formed from the exhausted core of a star more massive than the Sun. However, the possible progenitor channels leading to an explosion are a long-standing debate, limiting the precision and accuracy of supernovae Ia as distance indicators. Here we present HD 265435, a binary system with an orbital period of less than a hundred minutes that consists of a white dwarf and a hot subdwarf, which is a stripped core-helium-burning star. The total mass of the system is 1.65 +/- 0.25 solar masses, exceeding the Chandrasekhar limit (the maximum mass of a stable white dwarf). The system will merge owing to gravitational wave emission in 70 million years, likely triggering a supernova Ia event. We use this detection to place constraints on the contribution of hot subdwarf-white dwarf binaries to supernova Ia progenitors.

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Pelisoli, I., Neunteufel, P., Geier, S., Kupfer, T., Heber, U., Irrgang, A.,... Barlow, B.N. (2021). A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor. Nature Astronomy. https://doi.org/10.1038/s41550-021-01413-0


Pelisoli, Ingrid, et al. "A hot subdwarf-white dwarf super-Chandrasekhar candidate supernova Ia progenitor." Nature Astronomy (2021).

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