Rossby wave instability in weakly ionized protoplanetary disks. I. azimuthal or vertical B-fields
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arXiv
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| Format: | Preprint |
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2024
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| author | Cui, Can Tripathi, Ashutosh Yu, Cong Lin, Min-Kai Youdin, Andrew |
| author_facet | Cui, Can Tripathi, Ashutosh Yu, Cong Lin, Min-Kai Youdin, Andrew |
| contents | Rossby wave instability (RWI) is considered the underlying mechanism to crescent-shaped azimuthal asymmetries, discovered in (sub-)millimeter dust continuum of many protoplanetary disks. Previous works on linear theory were conducted in the hydrodynamic limit. Nevertheless, protoplanetary disks are likely magnetized and weakly ionized. We examine the influence of magnetic fields and non-ideal magnetohydrodynamic (MHD) effects - namely, Ohmic resistivity, Hall drift, and ambipolar diffusion - on the RWI unstable modes. We perform radially global linear analyses, employing constant azimuthal ($B_ϕ$) or vertical ($B_z$) background magnetic fields. It is found that, in the ideal MHD regime, magnetism can either enhance or diminish RWI growth. Strong non-ideal MHD effects cause RWI growth rates to recover hydrodynamic results. The sign of Hall Elsässer number subtly complicates the results, and vertical wavenumbers generically diminish growth rates. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_02103 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Rossby wave instability in weakly ionized protoplanetary disks. I. azimuthal or vertical B-fields Cui, Can Tripathi, Ashutosh Yu, Cong Lin, Min-Kai Youdin, Andrew Earth and Planetary Astrophysics Rossby wave instability (RWI) is considered the underlying mechanism to crescent-shaped azimuthal asymmetries, discovered in (sub-)millimeter dust continuum of many protoplanetary disks. Previous works on linear theory were conducted in the hydrodynamic limit. Nevertheless, protoplanetary disks are likely magnetized and weakly ionized. We examine the influence of magnetic fields and non-ideal magnetohydrodynamic (MHD) effects - namely, Ohmic resistivity, Hall drift, and ambipolar diffusion - on the RWI unstable modes. We perform radially global linear analyses, employing constant azimuthal ($B_ϕ$) or vertical ($B_z$) background magnetic fields. It is found that, in the ideal MHD regime, magnetism can either enhance or diminish RWI growth. Strong non-ideal MHD effects cause RWI growth rates to recover hydrodynamic results. The sign of Hall Elsässer number subtly complicates the results, and vertical wavenumbers generically diminish growth rates. |
| title | Rossby wave instability in weakly ionized protoplanetary disks. I. azimuthal or vertical B-fields |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2407.02103 |