Polarization Evolution of Fast Radio Burst Sources in Binary Systems
Recently, some fast radio bursts (FRBs) have been reported to exhibit complex and diverse variations in Faraday rotation measurements (RM) and polarization, suggesting that dynamically evolving magnetization environments may surround them. In this paper, we investigate the Faraday conversion (FC) ef...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acf5eb |
| _version_ | 1827789619282837504 |
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| author | Zhao-Yang Xia Yuan-Pei Yang Qiao-Chu Li Fa-Yin Wang Bo-Yang Liu Zi-Gao Dai |
| author_facet | Zhao-Yang Xia Yuan-Pei Yang Qiao-Chu Li Fa-Yin Wang Bo-Yang Liu Zi-Gao Dai |
| author_sort | Zhao-Yang Xia |
| collection | DOAJ |
| description | Recently, some fast radio bursts (FRBs) have been reported to exhibit complex and diverse variations in Faraday rotation measurements (RM) and polarization, suggesting that dynamically evolving magnetization environments may surround them. In this paper, we investigate the Faraday conversion (FC) effect in a binary system involving an FRB source and analyze the polarization evolution of FRBs. For a strongly magnetized high-mass companion binary, when an FRB with ∼100% linear polarization passes through the radial magnetic field of the companion star, the circular polarization (CP) component will be induced and oscillate symmetrically around the point with the degree of CP equal to zero, the rate and amplitude of the oscillation decrease as the frequency increases. The very strong plasma column density in the HMCBs can cause CP to oscillate with frequency at a very drastic rate, which may lead to depolarization. Near the superior conjunction of the binary orbit, the DM varies significantly due to the dense plasma near the companion, and the significant FC also occurs in this region. As the pulsar moves away from the superior conjunction, the CP gradually tends toward zero and then returns to its value before incidence. We also investigate the effect of the rotation of the companion star. We find that a sufficiently significant RM reversal can be produced at large magnetic inclinations and the RM variation is very diverse. Finally, we apply this model to explain some polarization observations of PSR B1744-24A and FRB 20201124A. |
| first_indexed | 2024-03-11T17:22:22Z |
| format | Article |
| id | doaj.art-2937cc5dff18477ea9f3d88772275e9a |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T17:22:22Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-2937cc5dff18477ea9f3d88772275e9a2023-10-19T08:27:30ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-019571110.3847/1538-4357/acf5ebPolarization Evolution of Fast Radio Burst Sources in Binary SystemsZhao-Yang Xia0https://orcid.org/0000-0001-5962-3139Yuan-Pei Yang1https://orcid.org/0000-0001-6374-8313Qiao-Chu Li2Fa-Yin Wang3https://orcid.org/0000-0003-4157-7714Bo-Yang Liu4Zi-Gao Dai5https://orcid.org/0000-0002-7835-8585School of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Ministry of Education, Nanjing 210023, People’s Republic of ChinaSouth-Western Institute for Astronomy Research, Yunnan University , Kunming 650500, People’s Republic of China ; ypyang@ynu.edu.cn; Purple Mountain Observatory, Chinese Academy of Sciences , Nanjing, Jiangsu 210023, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Ministry of Education, Nanjing 210023, People’s Republic of ChinaSchool of Astronomy and Space Science, Nanjing University , Nanjing 210023, People’s Republic of China; Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University , Ministry of Education, Nanjing 210023, People’s Republic of ChinaSouth-Western Institute for Astronomy Research, Yunnan University , Kunming 650500, People’s Republic of China ; ypyang@ynu.edu.cnDepartment of Astronomy, School of Physical Sciences, University of Science and Technology of China , Hefei 230026, People’s Republic of China daizg@ustc.edu.cnRecently, some fast radio bursts (FRBs) have been reported to exhibit complex and diverse variations in Faraday rotation measurements (RM) and polarization, suggesting that dynamically evolving magnetization environments may surround them. In this paper, we investigate the Faraday conversion (FC) effect in a binary system involving an FRB source and analyze the polarization evolution of FRBs. For a strongly magnetized high-mass companion binary, when an FRB with ∼100% linear polarization passes through the radial magnetic field of the companion star, the circular polarization (CP) component will be induced and oscillate symmetrically around the point with the degree of CP equal to zero, the rate and amplitude of the oscillation decrease as the frequency increases. The very strong plasma column density in the HMCBs can cause CP to oscillate with frequency at a very drastic rate, which may lead to depolarization. Near the superior conjunction of the binary orbit, the DM varies significantly due to the dense plasma near the companion, and the significant FC also occurs in this region. As the pulsar moves away from the superior conjunction, the CP gradually tends toward zero and then returns to its value before incidence. We also investigate the effect of the rotation of the companion star. We find that a sufficiently significant RM reversal can be produced at large magnetic inclinations and the RM variation is very diverse. Finally, we apply this model to explain some polarization observations of PSR B1744-24A and FRB 20201124A.https://doi.org/10.3847/1538-4357/acf5ebRadio transient sourcesPulsarsStellar winds |
| spellingShingle | Zhao-Yang Xia Yuan-Pei Yang Qiao-Chu Li Fa-Yin Wang Bo-Yang Liu Zi-Gao Dai Polarization Evolution of Fast Radio Burst Sources in Binary Systems The Astrophysical Journal Radio transient sources Pulsars Stellar winds |
| title | Polarization Evolution of Fast Radio Burst Sources in Binary Systems |
| title_full | Polarization Evolution of Fast Radio Burst Sources in Binary Systems |
| title_fullStr | Polarization Evolution of Fast Radio Burst Sources in Binary Systems |
| title_full_unstemmed | Polarization Evolution of Fast Radio Burst Sources in Binary Systems |
| title_short | Polarization Evolution of Fast Radio Burst Sources in Binary Systems |
| title_sort | polarization evolution of fast radio burst sources in binary systems |
| topic | Radio transient sources Pulsars Stellar winds |
| url | https://doi.org/10.3847/1538-4357/acf5eb |
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