A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles
The IW And-type phenomenon in cataclysmic variables presents a significant challenge to the accretion disk instability model. Using photometric data from the All-Sky Automated Survey for Supernovae, the Zwicky Transient Facility, and the Transiting Exoplanet Survey Satellite, we identify Karachurin...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad8446 |
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| author | Qi-Bin Sun Sheng-Bang Qian Li-Ying Zhu Qin-Mei Li Fu-Xing Li Min-Yu Li Ping Li |
| author_facet | Qi-Bin Sun Sheng-Bang Qian Li-Ying Zhu Qin-Mei Li Fu-Xing Li Min-Yu Li Ping Li |
| author_sort | Qi-Bin Sun |
| collection | DOAJ |
| description | The IW And-type phenomenon in cataclysmic variables presents a significant challenge to the accretion disk instability model. Using photometric data from the All-Sky Automated Survey for Supernovae, the Zwicky Transient Facility, and the Transiting Exoplanet Survey Satellite, we identify Karachurin 12 as a new noneclipsing IW And-type object with a cycle period of 35.69(3) days. We also report for the first time that Karachurin 12 is a negative superhump (NSH) system featuring precessing tilted disks, with precession, orbital, and NSH periods of 4.9588(2) days, 0.3168895(13) days, and 0.2979861(8) days, respectively. Our analysis, using dips as the index and NSHs as the probe, reveals diverse cycle patterns in Karachurin 12, with NSH amplitude varying throughout the cycle. These findings offer new insights for studying tilted disks and the IW And-type phenomenon. The mass-transfer burst model has difficulty explaining the observed variations in NSH amplitude, especially given the uncertainty surrounding the origin of the mass-transfer burst. Meanwhile, the tilted thermally unstable disk model indicates a possible connection to the IW And-type phenomenon, but it also struggles to account for the detailed variations in Karachurin 12. Therefore, a wider range of factors must be considered to fully understand the complex changes in Karachurin 12. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-596dd5c6783a44e3801ef2009afe9e8b2024-11-15T05:44:38ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01976110710.3847/1538-4357/ad8446A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse CyclesQi-Bin Sun0Sheng-Bang Qian1Li-Ying Zhu2https://orcid.org/0000-0002-0796-7009Qin-Mei Li3Fu-Xing Li4https://orcid.org/0000-0002-0285-6051Min-Yu Li5https://orcid.org/0000-0002-8564-8193Ping Li6Department of Astronomy, School of Physics and Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; qiansb@ynu.edu.cn; Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University , Kunming 650091, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; qiansb@ynu.edu.cn; Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University , Kunming 650091, People's Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , Kunming 650216, People's Republic of China; University of Chinese Academy of Sciences , No.19(A) Yuquan Road, Shijingshan District, Beijing, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; qiansb@ynu.edu.cn; Department of Physics, College of Physics, Guizhou University , Guiyang, 550025, People's Republic of ChinaDepartment of Astronomy, School of Physics and Astronomy, Yunnan University , Kunming 650091, People's Republic of China ; qiansb@ynu.edu.cn; Yunnan Observatories, Chinese Academy of Sciences , Kunming 650216, People's Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , Kunming 650216, People's Republic of China; University of Chinese Academy of Sciences , No.19(A) Yuquan Road, Shijingshan District, Beijing, People's Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , Kunming 650216, People's Republic of China; University of Chinese Academy of Sciences , No.19(A) Yuquan Road, Shijingshan District, Beijing, People's Republic of ChinaThe IW And-type phenomenon in cataclysmic variables presents a significant challenge to the accretion disk instability model. Using photometric data from the All-Sky Automated Survey for Supernovae, the Zwicky Transient Facility, and the Transiting Exoplanet Survey Satellite, we identify Karachurin 12 as a new noneclipsing IW And-type object with a cycle period of 35.69(3) days. We also report for the first time that Karachurin 12 is a negative superhump (NSH) system featuring precessing tilted disks, with precession, orbital, and NSH periods of 4.9588(2) days, 0.3168895(13) days, and 0.2979861(8) days, respectively. Our analysis, using dips as the index and NSHs as the probe, reveals diverse cycle patterns in Karachurin 12, with NSH amplitude varying throughout the cycle. These findings offer new insights for studying tilted disks and the IW And-type phenomenon. The mass-transfer burst model has difficulty explaining the observed variations in NSH amplitude, especially given the uncertainty surrounding the origin of the mass-transfer burst. Meanwhile, the tilted thermally unstable disk model indicates a possible connection to the IW And-type phenomenon, but it also struggles to account for the detailed variations in Karachurin 12. Therefore, a wider range of factors must be considered to fully understand the complex changes in Karachurin 12.https://doi.org/10.3847/1538-4357/ad8446Cataclysmic variable starsSemi-detached binary starsDwarf novae |
| spellingShingle | Qi-Bin Sun Sheng-Bang Qian Li-Ying Zhu Qin-Mei Li Fu-Xing Li Min-Yu Li Ping Li A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles The Astrophysical Journal Cataclysmic variable stars Semi-detached binary stars Dwarf novae |
| title | A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles |
| title_full | A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles |
| title_fullStr | A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles |
| title_full_unstemmed | A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles |
| title_short | A New IW And-type Star: Karachurin 12 with Tilted Disks and Diverse Cycles |
| title_sort | new iw and type star karachurin 12 with tilted disks and diverse cycles |
| topic | Cataclysmic variable stars Semi-detached binary stars Dwarf novae |
| url | https://doi.org/10.3847/1538-4357/ad8446 |
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