2016/05/30 by Mohsen Shadmehri, Razieh Oudi, Gohar Rastegarzade · 1 citation
Physics and Astronomy · #Accretion (finance) #Accretion disc #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Field (mathematics) #Instability #Magnetic field #Rotational symmetry #Stellar, planetary, and galactic studies #astro-ph.EP
paper · pdf · doi:10.1088/1674-4527/16/9/134
published in Research in Astronomy and Astrophysics 16(9), 002 (IOP Publishing) · Accepted for publication in Research in Astronomy and Astrophysics
arxiv created 2016/05/30 · openalex created_date 2016/06/24 · openalex publication_date 2016/08/30 · arxiv updated 2016/09/28 · openalex updated_date 2026/08/06
We study drag-driven instability in a protoplanetary disc consisting of a layer of single-sized dust particles which are coupled to the magnetized gas aerodynamically and the particle-to-gas feedback is included. We find a dispersion relation for axisymmetric linear disturbances and growth rate of the unstable modes are calculated numerically. While the secular gravitational instability in the absence of particle-togas feedback predicts the dust layer is unstable, magnetic fields significantly amplify the instability if the Toomre parameter for the gas component is fixed. We also show that even a weak magnetic field is able to amplify the instability more or less irrespective of the dust-gas coupling.