The Puzzling Superorbital Period Variation of the Low-mass X-ray Binary 4U 1820-30
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866912198951960576 |
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| author | Chou, Yi Wu, Jun-Lei Chen, Bo-Chun Chang, Wei-Yun |
| author_facet | Chou, Yi Wu, Jun-Lei Chen, Bo-Chun Chang, Wei-Yun |
| contents | Because of the previously observed stability of the 171-day period, the superorbital modulation of the low-mass X-ray binary 4U 1820-30 was considered a consequence of a third star orbiting around the binary. This study aims to further verify this triple model by testing the stability of superorbital period using the light curves collected by X-ray sky monitoring/scanning telescopes from 1987 to 2023. Both power spectral and phase analysis results indicate a significant change in the superorbital period from 171 days to 167 days over this 36-year span. The evolution of the superorbital phase suggests that the superorbital period may have experienced an abrupt change between early 2001 and mid-2003 or changed gradually with a period derivative of $\dot P_{sup}=(-4.20 \pm 0.72) \times 10^{-4}$ day/day. We conclude that the superorbital period of 4U 1820-30 was not as stable as anticipated by the triple model, which strongly challenges this hypothesis. Instead, we propose an irradiation-induced mass transfer instability scenario to explain the superorbital modulation of 4U 1820-30. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_08451 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Puzzling Superorbital Period Variation of the Low-mass X-ray Binary 4U 1820-30 Chou, Yi Wu, Jun-Lei Chen, Bo-Chun Chang, Wei-Yun High Energy Astrophysical Phenomena Because of the previously observed stability of the 171-day period, the superorbital modulation of the low-mass X-ray binary 4U 1820-30 was considered a consequence of a third star orbiting around the binary. This study aims to further verify this triple model by testing the stability of superorbital period using the light curves collected by X-ray sky monitoring/scanning telescopes from 1987 to 2023. Both power spectral and phase analysis results indicate a significant change in the superorbital period from 171 days to 167 days over this 36-year span. The evolution of the superorbital phase suggests that the superorbital period may have experienced an abrupt change between early 2001 and mid-2003 or changed gradually with a period derivative of $\dot P_{sup}=(-4.20 \pm 0.72) \times 10^{-4}$ day/day. We conclude that the superorbital period of 4U 1820-30 was not as stable as anticipated by the triple model, which strongly challenges this hypothesis. Instead, we propose an irradiation-induced mass transfer instability scenario to explain the superorbital modulation of 4U 1820-30. |
| title | The Puzzling Superorbital Period Variation of the Low-mass X-ray Binary 4U 1820-30 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2409.08451 |