Disc accretion onto a binary black hole in a hierarchical triple system as an origin of the most luminous hyper-soft sources
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866910046337630208 |
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| author | Popov, Sergei B. Lipunova, Galina V. |
| author_facet | Popov, Sergei B. Lipunova, Galina V. |
| contents | We propose that the recently discovered luminous hypersoft X-ray sources can be explained by accretion onto a binary black hole in a hierarchical triple system. For black hole masses $\sim 15 M_\odot$, the orbital separation of the internal binary might be $\sim 0.01 $~AU. If the donor provides $\gtrsim 10^{-8} M_\odot$ yr$^{-1}$, then the circumbinary accretion disc can explain the observed properties of the most luminous supersoft sources. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_08294 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Disc accretion onto a binary black hole in a hierarchical triple system as an origin of the most luminous hyper-soft sources Popov, Sergei B. Lipunova, Galina V. High Energy Astrophysical Phenomena We propose that the recently discovered luminous hypersoft X-ray sources can be explained by accretion onto a binary black hole in a hierarchical triple system. For black hole masses $\sim 15 M_\odot$, the orbital separation of the internal binary might be $\sim 0.01 $~AU. If the donor provides $\gtrsim 10^{-8} M_\odot$ yr$^{-1}$, then the circumbinary accretion disc can explain the observed properties of the most luminous supersoft sources. |
| title | Disc accretion onto a binary black hole in a hierarchical triple system as an origin of the most luminous hyper-soft sources |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.08294 |