Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields
The accretion of material from disks onto weakly magnetized objects invariably involves its traversal through a material surface, known as the boundary layer (BL). Our prior studies have revealed two distinct global wave modes for circumplanetary disks with BLs exhibiting opposite behaviors in spin...
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad7584 |
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| author | Zhihao Fu Shunquan Huang Cong Yu |
| author_facet | Zhihao Fu Shunquan Huang Cong Yu |
| author_sort | Zhihao Fu |
| collection | DOAJ |
| description | The accretion of material from disks onto weakly magnetized objects invariably involves its traversal through a material surface, known as the boundary layer (BL). Our prior studies have revealed two distinct global wave modes for circumplanetary disks with BLs exhibiting opposite behaviors in spin modulation. We perform a detailed analysis of the effects of magnetic fields on these global modes, highlighting how magnetic resonances and turning points could complicate the wave dynamics. The angular momentum flux becomes positive near the BL with increasing magnetic field strength. We also examine the perturbation profile to demonstrate the amplification of magnetic fields within the BL. The dependence of growth rates on the magnetic field strength and the spin rate are systematically investigated. We find that stronger magnetic fields tend to result in lower terminal spin rates. We stress the potential possibility of the formation of angular momentum belts and pressure bumps. The implications for the spin evolution and quasiperiodic oscillations observed in compact objects are also briefly discussed. Our calculations advance the understanding of magnetohydrodynamical accretion processes and lay a foundation for observational studies and numerical simulations. |
| format | Article |
| id | doaj-art-e4bdbd668aad4359982789573bb6b848 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-e4bdbd668aad4359982789573bb6b8482025-08-20T02:11:01ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-0197518010.3847/1538-4357/ad7584Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic FieldsZhihao Fu0https://orcid.org/0000-0002-9108-9500Shunquan Huang1https://orcid.org/0000-0002-7276-3694Cong Yu2https://orcid.org/0000-0003-0454-7890School of Physics and Astronomy, Sun Yat-Sen University , Zhuhai 519082, People's Republic of China ; yucong@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai 519082, People's Republic of China; State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology , Macau, People's Republic of China; Department of Physics, University of Hong Kong , Hong Kong SAR, People's Republic of ChinaSchool of Physics and Astronomy, Sun Yat-Sen University , Zhuhai 519082, People's Republic of China ; yucong@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai 519082, People's Republic of China; State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology , Macau, People's Republic of China; Department of Physics and Astronomy, University of Nevada , Las Vegas, 4505 South Maryland Parkway, Las Vegas, NV 89154, USASchool of Physics and Astronomy, Sun Yat-Sen University , Zhuhai 519082, People's Republic of China ; yucong@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Greater Bay Area , Zhuhai 519082, People's Republic of China; State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology , Macau, People's Republic of ChinaThe accretion of material from disks onto weakly magnetized objects invariably involves its traversal through a material surface, known as the boundary layer (BL). Our prior studies have revealed two distinct global wave modes for circumplanetary disks with BLs exhibiting opposite behaviors in spin modulation. We perform a detailed analysis of the effects of magnetic fields on these global modes, highlighting how magnetic resonances and turning points could complicate the wave dynamics. The angular momentum flux becomes positive near the BL with increasing magnetic field strength. We also examine the perturbation profile to demonstrate the amplification of magnetic fields within the BL. The dependence of growth rates on the magnetic field strength and the spin rate are systematically investigated. We find that stronger magnetic fields tend to result in lower terminal spin rates. We stress the potential possibility of the formation of angular momentum belts and pressure bumps. The implications for the spin evolution and quasiperiodic oscillations observed in compact objects are also briefly discussed. Our calculations advance the understanding of magnetohydrodynamical accretion processes and lay a foundation for observational studies and numerical simulations.https://doi.org/10.3847/1538-4357/ad7584AccretionExoplanet formation |
| spellingShingle | Zhihao Fu Shunquan Huang Cong Yu Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields The Astrophysical Journal Accretion Exoplanet formation |
| title | Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields |
| title_full | Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields |
| title_fullStr | Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields |
| title_full_unstemmed | Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields |
| title_short | Boundary Layers of Circumplanetary Disks around Spinning Planets. II. Global Modes with Azimuthal Magnetic Fields |
| title_sort | boundary layers of circumplanetary disks around spinning planets ii global modes with azimuthal magnetic fields |
| topic | Accretion Exoplanet formation |
| url | https://doi.org/10.3847/1538-4357/ad7584 |
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