Complex Structure around a Circumstellar Disk Caused by Interchange Instability
We perform a three-dimensional nonideal magnetohydrodynamic simulation of a strongly magnetized cloud core and investigate the complex structure caused by the interchange instability. This is the first simulation that does not use a central sink cell and calculates the long-term (>10 ^4 yr) evolu...
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/adabc5 |
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| author | Masahiro N. Machida Shantanu Basu |
| author_facet | Masahiro N. Machida Shantanu Basu |
| author_sort | Masahiro N. Machida |
| collection | DOAJ |
| description | We perform a three-dimensional nonideal magnetohydrodynamic simulation of a strongly magnetized cloud core and investigate the complex structure caused by the interchange instability. This is the first simulation that does not use a central sink cell and calculates the long-term (>10 ^4 yr) evolution even as the disk and outflow formation occur. The magnetic field dissipates inside the disk, and magnetic flux accumulates around the edge of the disk, leading to the occurrence of interchange instability. During the main accretion phase, the interchange instability occurs recurrently, disturbing the circumstellar region and forming ring, arc, and cavity structures. These are consistent with recent high-resolution observations of circumstellar regions around young protostars. The structures extend to >1000 au and persist for at least 30,000 yr after protostar formation, demonstrating the dynamic removal process of magnetic flux during star formation. We find that the disk continues to grow even as interchange instability occurs, by accretion through channels between the outgoing cavities. The outflow is initially weak but becomes strong after ∼10 ^3 yr. |
| format | Article |
| id | doaj-art-f4c3b8e253684ef88485e7251a5d8172 |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-f4c3b8e253684ef88485e7251a5d81722025-01-30T18:10:15ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019792L4910.3847/2041-8213/adabc5Complex Structure around a Circumstellar Disk Caused by Interchange InstabilityMasahiro N. Machida0https://orcid.org/0000-0002-0963-0872Shantanu Basu1https://orcid.org/0000-0003-0855-350XDepartment of Earth and Planetary Sciences, Faculty of Science, Kyushu University , Fukuoka 819-0395, Japan ; machida.masahiro.018@m.kyushu-u.ac.jp; Department of Physics and Astronomy, University of Western Ontario , London, ON N6A 3K7, CanadaDepartment of Physics and Astronomy, University of Western Ontario , London, ON N6A 3K7, Canada; Canadian Institute for Theoretical Astrophysics, University of Toronto , 60 St. George St., Toronto, ON M5S 3H8, CanadaWe perform a three-dimensional nonideal magnetohydrodynamic simulation of a strongly magnetized cloud core and investigate the complex structure caused by the interchange instability. This is the first simulation that does not use a central sink cell and calculates the long-term (>10 ^4 yr) evolution even as the disk and outflow formation occur. The magnetic field dissipates inside the disk, and magnetic flux accumulates around the edge of the disk, leading to the occurrence of interchange instability. During the main accretion phase, the interchange instability occurs recurrently, disturbing the circumstellar region and forming ring, arc, and cavity structures. These are consistent with recent high-resolution observations of circumstellar regions around young protostars. The structures extend to >1000 au and persist for at least 30,000 yr after protostar formation, demonstrating the dynamic removal process of magnetic flux during star formation. We find that the disk continues to grow even as interchange instability occurs, by accretion through channels between the outgoing cavities. The outflow is initially weak but becomes strong after ∼10 ^3 yr.https://doi.org/10.3847/2041-8213/adabc5MagnetohydrodynamicsStellar physicsProtostarsProtoplanetary disks |
| spellingShingle | Masahiro N. Machida Shantanu Basu Complex Structure around a Circumstellar Disk Caused by Interchange Instability The Astrophysical Journal Letters Magnetohydrodynamics Stellar physics Protostars Protoplanetary disks |
| title | Complex Structure around a Circumstellar Disk Caused by Interchange Instability |
| title_full | Complex Structure around a Circumstellar Disk Caused by Interchange Instability |
| title_fullStr | Complex Structure around a Circumstellar Disk Caused by Interchange Instability |
| title_full_unstemmed | Complex Structure around a Circumstellar Disk Caused by Interchange Instability |
| title_short | Complex Structure around a Circumstellar Disk Caused by Interchange Instability |
| title_sort | complex structure around a circumstellar disk caused by interchange instability |
| topic | Magnetohydrodynamics Stellar physics Protostars Protoplanetary disks |
| url | https://doi.org/10.3847/2041-8213/adabc5 |
| work_keys_str_mv | AT masahironmachida complexstructurearoundacircumstellardiskcausedbyinterchangeinstability AT shantanubasu complexstructurearoundacircumstellardiskcausedbyinterchangeinstability |