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

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arxiv 2107.09074 v1 pith:FTDXSGYO submitted 2021-07-19 astro-ph.SR astro-ph.COastro-ph.HE

Ingrid Pelisoli , P. Neunteufel , S. Geier , T. Kupfer , U. Heber , A. Irrgang , D. Schneider , A. Bastian
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J. van Roestel V. Schaffenroth B. N. Barlow
This is my paper · ORCID
classification astro-ph.SRastro-ph.COastro-ph.HE
keywords dwarfsupernovasystemwhitemassprogenitorstarsubdwarf-white
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Supernova 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 supernova Ia as distance indicators. Here we present HD265435, a binary system with an orbital period of less than a hundred minutes, consisting of a white dwarf and a hot subdwarf -- 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 due 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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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. A gravitational wave detectable candidate Type Ia supernova progenitor

    astro-ph.SR 2024-11 conditional novelty 6.0 of 10

    ATLAS J1138-5139 is a 28-minute binary of a 1.02-solar-mass and a 0.24-solar-mass white dwarf, the first candidate Type Ia supernova progenitor predicted to be detectable by LISA on its own.

  2. Type Ia supernovae

    astro-ph.HE 2024-11 unverdicted

    A review of Type Ia supernovae covering their physics, observational diversity, progenitor scenarios, and open questions, with no new research results.

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