The cosmic journey of dust grains -- from nucleation to planetary system
arXiv:2509.14325 · doi:10.1093/mnras/staf1562
Abstract
Dust is essential to the evolution of galaxies and drives the formation of planetary systems. The challenge of inferring the origin of different presolar dust grains from meteoritic samples motivates forward modelling to understand the contributions of low- and high-mass stars to dust in our Solar System. In this work we follow the evolution of dust with tracer particles within a hydrodynamical simulation of a Milky Way-like isolated disc galaxy. We find that nearly half of the grains released from stars lose less than of their initial mass due to thermal sputtering in the interstellar medium (ISM), with an average degree of atomisation higher for dust grains released by supernovae relative to asymptotic giant branch (AGB) star grains. We show through supernova remnant model variations that supernova (SN) dust survival is primarily shaped by the supernova bubble environment in the first million years (Myr) after the explosion rather than by its evolution during Myr in the ISM. The AGB/SN ratio of dust grains incorporated into newly formed stars approaches after a few hundred Myr of galactic evolution. Our analysis also shows that star-forming particles with short ( Myr) free-floating time-scales in the ISM are predominantly released from supernovae rather than AGB stars. This implies that the Solar System budget of short-lived radioactive isotopes such as Al, whose decay contributed to melting and differentiating planetesimals, should have been provided by massive stars with masses M.
Accepted for publication in MNRAS, 16 pages, 8 figures
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