Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375
EXO 2030+375 is a peculiar high-mass X-ray binary that has been exhibiting Type-I outburst activities consistently over the past decades. The phases of outburst peaks are generally stable and occur near the orbital periastron. However, significant orbital phase shifts have occasionally been observed...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/adc573 |
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| author | Run-Ting Huang Long Ji Jing-Zhi Yan |
| author_facet | Run-Ting Huang Long Ji Jing-Zhi Yan |
| author_sort | Run-Ting Huang |
| collection | DOAJ |
| description | EXO 2030+375 is a peculiar high-mass X-ray binary that has been exhibiting Type-I outburst activities consistently over the past decades. The phases of outburst peaks are generally stable and occur near the orbital periastron. However, significant orbital phase shifts have occasionally been observed in 1995, 2006, and 2016. In this paper, we report another orbital phase shift triggered by a giant outburst in 2021. During this event, the orbital phase of Type-I outburst peaks changed dramatically, moving from near periastron to 20 days after periastron, followed by a gradual recovery. Additionally, for several cycles after the 2021 giant outburst, some Type-I outbursts were missing, with subsequent outbursts occurring every two orbits. We discuss our observations in the frame of the precession of an eccentric Be disk. |
| format | Article |
| id | doaj-art-3eb0b0b2b1844678a7fe702a050ee2f8 |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-3eb0b0b2b1844678a7fe702a050ee2f82025-08-20T03:53:42ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0198416610.3847/1538-4357/adc573Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375Run-Ting Huang0Long Ji1https://orcid.org/0000-0001-9599-7285Jing-Zhi Yan2School of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; jilong@mail.sysu.edu.cnSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; jilong@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , DaXue Road 2, Zhuhai 519082, People’s Republic of ChinaKey Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing 210023, People’s Republic of ChinaEXO 2030+375 is a peculiar high-mass X-ray binary that has been exhibiting Type-I outburst activities consistently over the past decades. The phases of outburst peaks are generally stable and occur near the orbital periastron. However, significant orbital phase shifts have occasionally been observed in 1995, 2006, and 2016. In this paper, we report another orbital phase shift triggered by a giant outburst in 2021. During this event, the orbital phase of Type-I outburst peaks changed dramatically, moving from near periastron to 20 days after periastron, followed by a gradual recovery. Additionally, for several cycles after the 2021 giant outburst, some Type-I outbursts were missing, with subsequent outbursts occurring every two orbits. We discuss our observations in the frame of the precession of an eccentric Be disk.https://doi.org/10.3847/1538-4357/adc573High mass x-ray binary starsX-ray binary starsB(e) stars |
| spellingShingle | Run-Ting Huang Long Ji Jing-Zhi Yan Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 The Astrophysical Journal High mass x-ray binary stars X-ray binary stars B(e) stars |
| title | Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 |
| title_full | Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 |
| title_fullStr | Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 |
| title_full_unstemmed | Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 |
| title_short | Orbital Phase Shifts of Type-I Outbursts in EXO 2030+375 |
| title_sort | orbital phase shifts of type i outbursts in exo 2030 375 |
| topic | High mass x-ray binary stars X-ray binary stars B(e) stars |
| url | https://doi.org/10.3847/1538-4357/adc573 |
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