A New IW And-Type Star: Karachurin 12 with Tilted Disks and Diverse cycles
| Autor: | Sun, Qi-Bin, Qian, Sheng-Bang, Zhu, Li-Ying, Li, Qin-Mei, Li, Fu-Xing, Li, Min-Yu, Li, Ping |
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| Rok vydání: | 2024 |
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| Druh dokumentu: | Working Paper |
| Popis: | The IW And 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 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 a precessing tilted disk, 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 indexes and NSHs as probes, reveals diverse cycle patterns in Karachurin 12, with NSH amplitude varying throughout the cycle. Analyses of NSH behaviour using multiple methods shows that the amplitude decreases with increasing outbursts and increases with weakening outbursts, which we suggest is related to changes in the radius of the accretion disk. The mass transfer outburst model fails to explain the observed NSH amplitude variations, whereas the tilted thermally unstable disk model accounts for most of the observed cycles and dip patterns, particularly the disappearance of the IW And phenomenon when NSHs become undetectable. However, no significant changes in the NSH period were observed. These findings suggest a potential link between the IW And phenomenon and a tilted disk. Further improvements in simulations are needed to better understand the detailed dynamics of these cycles. Comment: 22 pages, 9 figures and 3 tables |
| Databáze: | arXiv |
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