On how optical depth tunes the effects of the interstellar medium on debris discs

摘要: The flux of neutral atoms the interstellar medium (ISM) surrounding stars and their environment affects motion dust particles in debris discs, causing a significant dynamical evolution. Large values eccentricity inclination can be excited, strong correlations settle among orbital angles. This behaviour, particular for bound grains, potentially cause asymmetries dusty discs around solar-type stars, which might detected by observations. However, amount change as result this non-gravitational perturbation is strongly limited collisional lifetime particles. We show that, large disc's optical depth, influence ISM flow on disc shape almost negligible. because grains are collisionally destroyed before they accumulate enough changes perturbations. smaller than 10−3, peculiar asymmetric patterns appear density profile when we consider 1–10 μm just above blow-out threshold. extent relevance these grow lower depth. An additional sink mechanism, prevent formation clumps warping related to fast inward migration drag component forces. When enlarged perturbations, forces (Poynting–Robertson and, particular, drag) drive migrating tracks, leading them into star short time-scale. It then expected that with small depth expand inside parent body ring all way towards star, while would not significantly extend inside.