Multiphase State Transitions and Thermal-Tidal Decoupling in the AM CVn-Type Star V803 Cen
文献类型：期刊论文
| 作者 | Sun, Qi-Bin3; Qian, Sheng-Bang3; Zhu LY(朱俐颖)1,2; Li, Qin-Mei3; Liao WP(廖文萍)1,2; Li, Fu-Xing3; Lin, Wen-Xu3; Li MY(李敏榆)1,2; Li P(李平)1,2; Li, Zi-Mo3 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2026-01-10 |
| 卷号 | 996期号:2 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ae1d6a |
| 产权排序 | 第2完成单位 |
| 文献子类 | Article |
| 英文摘要 | AM CVn systems are ultracompact, short-period binaries emitting multimessenger signals and showing both normal outbursts and superoutbursts. They serve as ideal laboratories for studying accretion physics under extreme conditions and for testing the disk instability model (DIM) and thermal-tidal instability (TTI) framework. Here we report the detection of 10 new minor outbursts for the AM CVn-type system V803 Cen by TESS. Positive superhumps (PSHs) are discovered across multiple evolutionary phases, providing direct evidence of decoupled tidal and thermal instabilities. Notably, transient PSHs appear during the initial rise of normal outbursts and fade as the outburst progresses-contrary to predictions from both the DIM (which expects the disk radius to increase during rise) and the TTI (which predicts that PSHs should not disappear once the disk has surpassed the 3:1 resonance radius and continues to expand). During the high state, we reveal multiphase transitions through a superoutburst, dip, cycling state (similar to 13.5-14.5 mag), and stable standstill (similar to 13.5 mag). This stable standstill is found for the first time, suggesting that the accretion disk variability is more complex than simple oscillations during the standstill-like states, offering new insights into the physics of disk evolution. While superoutburst and supercycle durations remain stable, high-state durations range from tens to hundreds of days, suggesting additional disk replenishment mechanisms beyond supercycle accumulation. We suggest enhanced mass transfer due to variable irradiation of the secondary as the primary driver. The complex variations in V803 Cen likely arise from coupled processes including DIM, TTI in low mass ratio systems, modulated mass transfer fluctuations, and irradiation-enhanced mass transfer. |
| 学科主题 | 天文学 ; 恒星与银河系 |
| URL标识 | 查看原文 |
| 出版地 | No.2 The Distillery, Glassfields, Avon Street, Bristol, ENGLAND |
| WOS关键词 | DISK-INSTABILITY MODEL ; DWARF-NOVA ; WHITE-DWARF ; ACCRETION DISK ; ORBITAL PERIOD ; X-RAY ; CATACLYSMIC VARIABLES ; TILTED DISKS ; LIGHT-CURVE ; HELIUM NOVA |
| 资助项目 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Yunnan Province (Yunnan Natural Science Foundation)[202501AS070055]; (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Yunnan Province (Yunnan Natural Science Foundation)[202503AP140013]; (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Yunnan Province (Yunnan Natural Science Foundation)[202201AT070092]; (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Yunnan Province (Yunnan Natural Science Foundation)[202401AT070143]; MOST divided by National Natural Science Foundation of China (NSFC)[12503040]; MOST divided by National Natural Science Foundation of China (NSFC)[11933008]; MOST divided by National Natural Science Foundation of China (NSFC)[12303040]; MOST divided by National Key Research and Development Program of China (NKPs)[2022YFE0116800] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001654381400001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Yunnan Province (Yunnan Natural Science Foundation)[202501AS070055, 202503AP140013, 202201AT070092, 202401AT070143] ; MOST divided by National Natural Science Foundation of China (NSFC)[12503040, 11933008, 12303040] ; MOST divided by National Key Research and Development Program of China (NKPs)[2022YFE0116800] |
| 版本 | 出版稿 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/28813]  |
| 专题 | 云南天文台_双星与变星研究组 |
| 通讯作者 | Qian, Sheng-Bang |
| 作者单位 | 1.Yunnan Observatories, Chinese Academy of Sciences, Kunming 650216, People’s Republic of China; 2.University of Chinese Academy of Sciences, No.19(A) Yuquan Road, Shijingshan District, Beijing, People’s Republic of China 3.Department of Astronomy, School of Physics and Astronomy, Yunnan University, Kunming 650091, People’s Republic of China; qiansb@ynu.edu.cn; |
| 推荐引用方式 GB/T 7714 | Sun, Qi-Bin,Qian, Sheng-Bang,Zhu LY,et al. Multiphase State Transitions and Thermal-Tidal Decoupling in the AM CVn-Type Star V803 Cen[J]. ASTROPHYSICAL JOURNAL,2026,996(2). |
| APA | Sun, Qi-Bin.,Qian, Sheng-Bang.,朱俐颖.,Li, Qin-Mei.,廖文萍.,...&Zhang, Mao-Han.(2026).Multiphase State Transitions and Thermal-Tidal Decoupling in the AM CVn-Type Star V803 Cen.ASTROPHYSICAL JOURNAL,996(2). |
| MLA | Sun, Qi-Bin,et al."Multiphase State Transitions and Thermal-Tidal Decoupling in the AM CVn-Type Star V803 Cen".ASTROPHYSICAL JOURNAL 996.2(2026). |
入库方式： OAI收割
来源：云南天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。