An analytical test case for dust dynamics during a shock-wave passage

TL;DR

This paper presents an exact analytical solution for dust dynamics during shock wave passage in a one-dimensional gas-dust flow, aiding understanding of astrophysical phenomena like shell formation around carbon stars.

Contribution

It introduces a novel exact solution to the forced Burgers' equation modeling dust-gas interactions during shock waves, using the Wright omega function.

Findings

Exact solution derived for dust dynamics in shock passage

Analytical model applicable to astrophysical shell formation

Simplifies complex dust-gas interaction equations

Abstract

An exact solution of a forced Burgers' equation representing the dynamics of a "dust fluid" in a one-dimensional flow is presented. The test case considered starts with a steady (time independent) two-fluid flow in one dimension, where the two fluid components represent gas and dust. It is then assumed that a shock wave travels through the gas at a constant speed and without radiative energy losses and diffusion. Then, adopting a constant stopping time for the dust particles in the dust fluid (mono-dispersed grain sizes), the equation of motion for the dust fluid can be transformed into a simple ordinary differential equation, which is satisfied by the Wright omega function. Implications for the formation of detached shells around carbon stars are briefly discussed.