A New Puzzling Periodic Signal in GeV Energies of the $γ$-Ray Binary LS I +61$^\circ$303
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866911902341267456 |
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| author | Zhang, Pengfei |
| author_facet | Zhang, Pengfei |
| contents | LS I + 61$^\circ$303 is a high-mass X-ray binary system comprising a massive Be star and a rapidly rotating neutron star. Its spectral energy distribution across multi-wavelengths categorizes it as a $γ$-ray binary system. In our analysis of LS I + 61$^\circ$303 using Fermi-LAT observations, we not only confirmed the three previously discussed periodicities of orbital, superorbital, and orbital-superorbital beat periods observed in multi-wavelength observations, but also identified an additional periodic signal. This newly discovered signal exhibits a period of $\sim$26.3 day at a $\sim7σ$ confidence level. Moreover, the power spectrum peak of the new signal gradually decreases as the energy increases across the energy ranges of 0.1-0.3, 0.3-1.0, and 1.0-500.0 GeV. Interestingly, a potential signal with a similar period was found in data obtained from the Owens Valley Radio Observatory 40 m telescope. We suggest that the newly discovered periodic signal may originate from a coupling between the orbital period and the retrograde stellar precession period. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_02042 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A New Puzzling Periodic Signal in GeV Energies of the $γ$-Ray Binary LS I +61$^\circ$303 Zhang, Pengfei High Energy Astrophysical Phenomena LS I + 61$^\circ$303 is a high-mass X-ray binary system comprising a massive Be star and a rapidly rotating neutron star. Its spectral energy distribution across multi-wavelengths categorizes it as a $γ$-ray binary system. In our analysis of LS I + 61$^\circ$303 using Fermi-LAT observations, we not only confirmed the three previously discussed periodicities of orbital, superorbital, and orbital-superorbital beat periods observed in multi-wavelength observations, but also identified an additional periodic signal. This newly discovered signal exhibits a period of $\sim$26.3 day at a $\sim7σ$ confidence level. Moreover, the power spectrum peak of the new signal gradually decreases as the energy increases across the energy ranges of 0.1-0.3, 0.3-1.0, and 1.0-500.0 GeV. Interestingly, a potential signal with a similar period was found in data obtained from the Owens Valley Radio Observatory 40 m telescope. We suggest that the newly discovered periodic signal may originate from a coupling between the orbital period and the retrograde stellar precession period. |
| title | A New Puzzling Periodic Signal in GeV Energies of the $γ$-Ray Binary LS I +61$^\circ$303 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2406.02042 |