Large dust grains escaping from a supernova remnant
Abstract
Dust grains produced in the supernova (SN) ejecta at early ages are partially destroyed in hot gas of the SN remnant. Large grains owing to their inertia can overtake the forward shock front of the remnant and move through the ambient interstellar medium. Using one-dimensional gas dynamics including the dust destruction we study the transport of dust grains inside the SN remnant and the ambient medium. Here we estimate the surviving and escaping mass fractions depending on the cut-off (maximum) size in a power-law distribution of grain sizes. We found that these fractions follow closely each other at late age of the SN remnant, i.e. almost all grains, which have survived in the remnant, leave it for the ambient interstellar medium. At the age of 30 kyr -- the onset of the radiative phase with density n∼ 1 cm−3 with solar metallicity -- the escaping/surviving mass fractions for the cut-off size of several microns reach about 0.7−0.8. The major part of these grains have size larger than 1 μm and initially located at distances ≳ 0.2 of the ejecta core radius. Later dust grains at velocity of several hundreds km/s escaping the remnant continue to be destroyed due to kinetic sputtering in the interstellar medium. Grains with sizes of several microns are destroyed marginally and therefore will survive in the interstellar gas. After decelerating of grains in the medium the surviving mass fraction of grains produced in the SN remnant, which evolves in an ambient gas with n from 1 to 100 cm−3, is from ∼ 0.5 to ∼ 0.3, respectively, for the cut-off grain size acut = 10 μm. A decrease of the cut-off size in the distribution results in lower surviving mass fraction.
Related
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BibTeX
@misc{vasiliev2026large,
title = {{Large dust grains escaping from a supernova remnant}},
author = {Evgenii O. Vasiliev},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.19771},
eprint = {2610.19771},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.19771},
}
RIS
TY - UNPB
TI - Large dust grains escaping from a supernova remnant
AU - Evgenii O. Vasiliev
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2610.19771
UR - https://arxiv.org/abs/2610.19771
AB - Dust grains produced in the supernova (SN) ejecta at early ages are partially destroyed in hot gas of the SN remnant. Large grains owing to their inertia can overtake the forward shock front of the remnant and move through the ambient interstellar medium. Using one-dimensional gas dynamics including the dust destruction we study the transport of dust grains inside the SN remnant and the ambient medium. Here we estimate the surviving and escaping mass fractions depending on the cut-off (maximum) size in a power-law distribution of grain sizes. We found that these fractions follow closely each other at late age of the SN remnant, i.e. almost all grains, which have survived in the remnant, leave it for the ambient interstellar medium. At the age of 30 kyr -- the onset of the radiative phase with density n∼ 1 cm^−3 with solar metallicity -- the escaping/surviving mass fractions for the cut-off size of several microns reach about 0.7−0.8. The major part of these grains have size larger than 1 μm and initially located at distances ≳ 0.2 of the ejecta core radius. Later dust grains at velocity of several hundreds km/s escaping the remnant continue to be destroyed due to kinetic sputtering in the interstellar medium. Grains with sizes of several microns are destroyed marginally and therefore will survive in the interstellar gas. After decelerating of grains in the medium the surviving mass fraction of grains produced in the SN remnant, which evolves in an ambient gas with n from 1 to 100 cm^−3, is from ∼ 0.5 to ∼ 0.3, respectively, for the cut-off grain size a_cut = 10 μm. A decrease of the cut-off size in the distribution results in lower surviving mass fraction.
ER -