| Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features | |
Lin, Jiamao1,2; Ren, Liangliang3; Li, Chengyuan1,2; Nancy, Elias-Rosa4,5; Cang, Tianqi6; Ge HW(葛宏伟)7,8 ; Thomas Tam, Pak-Hin1,2; Huang, Wenjun1,2; Li, Yilong1,2; Wang, Xiaofeng9,10; Huang, Yang11,12; Ma, Bo1,2
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| 发表期刊 | Astronomy and Astrophysics
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| 2025-02-01 | |
| 卷号 | 694 |
| DOI | 10.1051/0004-6361/202452177 |
| 产权排序 | 第7完成单位 |
| 收录类别 | SCI ; EI |
| 关键词 | binaries: close binaries: spectroscopic stars: magnetic field novae cataclysmic variables white dwarfs |
| 摘要 | Context. A new X-ray Cataclysmic variable (CV) candidate exhibits distinct light-curve characteristics in the ZTF's g, r, and i bands. The paper includes the optical identification and multiwavelength analysis of this CV candidate. Aims. This work aims to determine if a previously identified CV candidate, ZTF J0112+5827, is a polar system by examining its X-ray and cyclotron radiation characteristics. Methods. We characterized the X-ray emission of ZTF J0112+5827 using the ROSAT observations. The gri-band optical light curves were obtained from the Zwicky Transient Facility. After two nights of time-domain spectroscopic observations with the Palomar 200-inch telescope, we mapped the accretion structures using Doppler tomography. Results. ZTF J0112+5827 exhibits an orbital period of 80.9 minutes, determined from the ZTF light curves, and an average X-ray flux of (68.4 ± 15.7)× 10-14 erg s-1 cm-2 in the 0.1a-2.4 keV range. It shows an ellipsoidal-like variability curve in the g band, with two prominent humps around phases of ∼0.0 and ∼0.7 in the i and r bands. In the spectra corresponding to these phases, a redward-increasing power-law continuum appears, which is accompanied by prominent features of cyclotron emission humps. Emission lines of He II and Balmer series were observed. The magnetic field strength of ZTF J0112+5827 was determined from the cyclotron harmonics. Its tomography map revealed the presence of accretion streams, but there was no evidence of an accretion disk structure. The line-of-sight velocity of the Balmer emission was measured at about 500 km s-1, the majority of which was contributed by accretion streams and accretion spots. Our result confirms that ZTF J0112+5827 is a polar system. It contains a magnetic white dwarf with a magnetic field strength of 38.7-1.1+1.3 MG. © The Authors 2025. |
| 资助项目 | N/A |
| 项目资助者 | N/A |
| 语种 | 英语 |
| 学科领域 | 天文学 ; 恒星与银河系 |
| 文章类型 | Journal article (JA) |
| ISSN | 0004-6361 |
| URL | 查看原文 |
| EI入藏号 | 20250717878144 |
| EI主题词 | White dwarfs |
| EI分类号 | 1301.1.2 Physical Properties of Gases, Liquids and Solids - 1301.1.3 Atomic and Molecular Physics - 1301.1.3.1 Spectroscopy - 1301.2.1 High Energy Physics - 1301.2.1.1 Particle Accelerators - 1302.1.2 Extraterrestrial Physics and Stellar Phenomena - 711 Electromagnetic Waves - 711.1 Electromagnetic Waves in Different Media - 741.1 Light/Optics - 744.5 Laser Beam Interactions |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://ir.ynao.ac.cn/handle/114a53/28170 |
| 专题 | 大样本恒星演化研究组 |
| 作者单位 | 1.School of Physics and Astronomy, Sun Yat-sen University, Zhuhai, 519082, China; 2.CSST Science Center for the Guangdong-Hongkong-Macau Greater Bay Area, Sun Yat-sen University, Zhuhai, 519082, China; 3.School of Electrical and Electronic Engineering, Anhui Science and Technology University, Anhui, Bengbu, 233030, China; 4.INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, Padova, 35122, Italy; 5.Institute of Space Sciences (ICE), Consejo Superior de Investigaciones CientÃífIcas (CSIC), Barcelona, Spain; 6.School of Physics and Astronomy, Beijing Normal University, Beijing, 100875, China; 7.Yunnan Observatories, Chinese Academy of Sciences, Kunming, 650216, China; 8.International Center of Supernovae, Yunnan Key Laboratory, Kunming, 650216, China; 9.Physics Department and Tsinghua, Center for Astrophysics, Tsinghua University, Beijing, 100084, China; 10.Beijing Planetarium, Beijing Academy of Science and Technology, Beijing, 100044, China; 11.University of Chinese Academy of Sciences, Beijing, 100049, China; 12.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, China |
| 推荐引用方式 GB/T 7714 | Lin, Jiamao,Ren, Liangliang,Li, Chengyuan,et al. Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features[J]. Astronomy and Astrophysics,2025,694. |
| APA | Lin, Jiamao.,Ren, Liangliang.,Li, Chengyuan.,Nancy, Elias-Rosa.,Cang, Tianqi.,...&Ma, Bo.(2025).Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features.Astronomy and Astrophysics,694. |
| MLA | Lin, Jiamao,et al."Discovery and characterization of ZTF J0112+5827: An 80.9-minute polar with strong cyclotron features".Astronomy and Astrophysics 694(2025). |
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