Superorbital Modulation at GeV Energies in the γ-Ray Binary LS I?+?61°303
文献类型：期刊论文
| 作者 | Xing,Yi2; Wang,Zhongxiang2; Takata,Jumpei1 |
| 刊名 | The Astrophysical Journal
 |
| 出版日期 | 2017-12-15 |
| 卷号 | 851期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | gamma rays: stars stars: individual (LS I +61°303) X-rays: binaries |
| DOI | 10.3847/1538-4357/aa9b36 |
| 英文摘要 | Abstract We report the results from our analysis of eight years of the data for the γ-ray binary LS I +61°303, obtained with the Large Area Telescope on board the Fermi Gamma-Ray Space Telescope. We find a significant dip around the binary’s periastron in the superorbital light curves, and by fitting the light curves with a sinusoidal function, clear phase shifts are obtained. The superorbital modulation seen in the binary has been long known and different scenarios have been proposed. Based on our results, we suggest that the circumstellar disk around the Be companion of this binary may have a non-axisymmetric structure, which rotates at the superorbital period of 1667 days. As a result, the density of the ambient material around the compact star of the binary changes along the binary orbit over the superorbital period, causing the phase shifts in the modulation, and around periastron, the compact star probably enters the Be disk or switches the mode of its emission due to the intereaction with the disk, causing the appearance of the dip. We discuss the implications of this possible scenario to the observed superorbital properties at multiple frequencies. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-851-2-AA9B36 |
| 源URL | [http://119.78.226.72/handle/331011/32099]  |
| 专题 | 中国科学院上海天文台 |
| 作者单位 | 1.Physics Department, Huazhong University of Science and Technology, Wuhan 430074, China 2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, China |
| 推荐引用方式 GB/T 7714 | Xing,Yi,Wang,Zhongxiang,Takata,Jumpei. Superorbital Modulation at GeV Energies in the γ-Ray Binary LS I?+?61°303[J]. The Astrophysical Journal,2017,851(2). |
| APA | Xing,Yi,Wang,Zhongxiang,&Takata,Jumpei.(2017).Superorbital Modulation at GeV Energies in the γ-Ray Binary LS I?+?61°303.The Astrophysical Journal,851(2). |
| MLA | Xing,Yi,et al."Superorbital Modulation at GeV Energies in the γ-Ray Binary LS I?+?61°303".The Astrophysical Journal 851.2(2017). |
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来源：上海天文台
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