“Ashfall” Induced by Molecular Outflow in Protostar Evolution. II. Analytical Study on the Maximum Size of Dust Grains Lifted by Outflows
Year: 2025
Type: article
Abstract: In this paper, we study the dust dynamics in the molecular outflow using an analytical magnetohydrodynamical outflow model. Specifically, we investigate the maximum size of dust grains a d ,max that can be lifted by the outflow and whether they can escape into interstellar space. We also investigate the dependence of the maximum size of the dust grains on various outflow parameters, such as the mass ejection rate of the outflow M ̇ , the disk size r disk, the mass of the central protostar M *, and the internal dust density ρ mat. We find the empirical formula for the maximum dust size as a function of the outflow parameters. Parameter a d ,max depends on the parameters as a d ,max ∝ M ̇ 1.0 r disk − 0.44 M * − 0.82 ρ mat − 1.0 . We also find that the dust grains with sizes of 100 μm to 1 mm can be lifted by the outflow and can distribute well outside of the disk when the mass ejection rate of the outflow has a value of 10−7 to 10−6 M ⊙ yr−1. This result is consistent with recent observations that show a correlation between the mass ejection rate of the outflow and the spectral index β of the dust opacity at the envelope scale.
Source: The Astrophysical Journal
Institutions: Kagoshima University, Nagasaki University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
OpenAlex ID: W4410178204