Superorbital Modulation at GeV Energies in the gamma-Ray Binary LS I+61 degrees 303
文献类型：期刊论文
| 作者 | Xing, Yi1; Wang, Zhongxiang1; Takata, Jumpei2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-12-20 |
| 卷号 | 851期号:2 |
| ISSN号 | 0004-637X |
| 关键词 | Gamma Rays: Stars Stars: Individual (Ls i+61 Degrees 303) X-rays: Binaries |
| DOI | 10.3847/1538-4357/aa9b36 |
| 英文摘要 | We report the results from our analysis of eight years of the data for the gamma-ray binary LS I +61 degrees 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. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000418111100010 |
| 源URL | [http://119.78.226.72/handle/331011/32465]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Xing, Yi |
| 作者单位 | 1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 2.Huazhong Univ Sci & Technol, Phys Dept, Wuhan 430074, Hubei, Peoples R China |
| 推荐引用方式 GB/T 7714 | Xing, Yi,Wang, Zhongxiang,Takata, Jumpei. Superorbital Modulation at GeV Energies in the gamma-Ray Binary LS I+61 degrees 303[J]. ASTROPHYSICAL JOURNAL,2017,851(2). |
| APA | Xing, Yi,Wang, Zhongxiang,&Takata, Jumpei.(2017).Superorbital Modulation at GeV Energies in the gamma-Ray Binary LS I+61 degrees 303.ASTROPHYSICAL JOURNAL,851(2). |
| MLA | Xing, Yi,et al."Superorbital Modulation at GeV Energies in the gamma-Ray Binary LS I+61 degrees 303".ASTROPHYSICAL JOURNAL 851.2(2017). |
入库方式： OAI收割
来源：上海天文台
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。