2016/11/02 by Olga Katushkina, Dmitry Alexashov, D. B. Alexashov +4
Physics and Astronomy · #Astro and Planetary Science #Astrophysics #Astrophysics and Star Formation Studies #Atmospheric sciences #Circumstellar dust #Cirrus #Cosmic dust #Dusty plasma #Electron #Galaxy #Gyroradius #Interstellar medium #Lorentz force #Magnetic field #Physics #Quantum mechanics #Solar and Space Plasma Dynamics #astro-ph.SR
paper · pdf · doi:10.1093/mnras/stw2833
published as MNRAS, vol. 465, issue 2, pp. 1573-1585, 2017 · 14 pages, 13 figures, published in MNRAS
openalex publication_date 2016/11/02 · openalex created_date 2016/11/11 · arxiv created 2016/12/26 · arxiv updated 2016/12/28 · openalex updated_date 2026/08/05
High-resolution mid-infrared observations of astrospheres show that many of them have filamentary (cirrus-like) structure. Using numerical models of dust dynamics in astrospheres, we suggest that their filamentary structure might be related to specific spatial distribution of the interstellar dust around the stars, caused by a gyrorotation of charged dust grains in the interstellar magnetic field. Our numerical model describes the dust dynamics in astrospheres under an influence of the Lorentz force and assumption of a constant dust charge. Calculations are performed for the dust grains with different sizes separately. It is shown that non-monotonic spatial dust distribution (viewed as filaments) appears for dust grains with the period of gyromotion comparable with the characteristic time-scale of the dust motion in the astrosphere. Numerical modelling demonstrates that the number of filaments depends on charge-to-mass ratio of dust.