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- W4317361202 abstract "The size of dust grains, $a$, is key to the physical and chemical processes in circumstellar disks, but observational constraints of grain size remain challenging. (Sub)millimeter continuum observations often show a percent-level polarization parallel to the disk minor axis, which is generally attributed to scattering by $sim 100mu$m-sized spherical grains (with a size parameter $x equiv 2pi a / lambda < 1$, where $lambda$ is the wavelength). Larger spherical grains (with $x$ greater than unity) would produce opposite polarization direction. However, the inferred size is in tension with the opacity index $beta$ that points to larger mm/cm-sized grains. We investigate the scattering-produced polarization by large irregular grains with a range of $x$ greater than unity with optical properties obtained from laboratory experiments. Using the radiation transfer code, RADMC-3D, we find that large irregular grains still produce polarization parallel to the disk minor axis. If the original forsterite refractive index in the optical is adopted, then all samples can produce the typically observed level of polarization. Accounting for the more commonly adopted refractive index using the DSHARP dust model, only grains with $x$ of several (corresponding to $sim$mm-sized grains) can reach the same polarization level. Our results suggest that grains in disks can have sizes in the millimeter regime, which may alleviate the tension between the grain sizes inferred from scattering and other means. Additionally, if large irregular grains are not settled to the midplane, their strong forward scattering can produce asymmetries between the near and far side of an inclined disk, which can be used to infer their presence." @default.
- W4317361202 created "2023-01-19" @default.
- W4317361202 creator A5017637934 @default.
- W4317361202 creator A5034298995 @default.
- W4317361202 creator A5054676844 @default.
- W4317361202 creator A5060264145 @default.
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- W4317361202 creator A5079490705 @default.
- W4317361202 creator A5080987263 @default.
- W4317361202 creator A5083049965 @default.
- W4317361202 date "2023-01-18" @default.
- W4317361202 modified "2023-10-16" @default.
- W4317361202 title "(Sub)millimetre dust polarization of protoplanetary discs from scattering by large millimetre-sized irregular grains" @default.
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