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The Effect of Dust Composition and Shape on Radiation-pressure Forces and Blowout Sizes of Particles in Debris Disks

The Astronomical journal, 2019-04, Vol.157 (4), p.157 [Peer Reviewed Journal]

2019. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Apr 2019 ;ISSN: 0004-6256 ;ISSN: 1538-3881 ;EISSN: 1538-3881 ;DOI: 10.3847/1538-3881/ab095e

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Title:
The Effect of Dust Composition and Shape on Radiation-pressure Forces and Blowout Sizes of Particles in Debris Disks
Author: Arnold, Jessica A. ; Weinberger, Alycia J. ; Videen, Gorden ; Zubko, Evgenij S.
Subjects: ABSORPTION ; Absorption cross sections ; Absorptivity ; Accretion disks ; ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ; circumstellar matter ; COMPACTS ; Composition effects ; COSMIC DUST ; CROSS SECTIONS ; Debris ; Detritus ; Dipoles ; Dust ; Dust composition ; Dust effects ; Dust particles ; Effective medium theory ; Grains ; Mie scattering ; Mie theory ; MORPHOLOGY ; planetary systems ; POROSITY ; protoplanetary disks ; PROTOPLANETS ; Radiation ; RADIATION PRESSURE ; radiation: dynamics ; SCATTERING ; Space debris ; STARS
Is Part Of: The Astronomical journal, 2019-04, Vol.157 (4), p.157
Description: The light scattered from dust grains in debris disks is typically modeled as compact spheres using the Lorenz-Mie theory or as porous spheres by incorporating an effective medium theory. In this work we examine the effect of incorporating a more realistic particle morphology on estimated radiation-pressure blowout sizes. To calculate the scattering and absorption cross-sections of irregularly shaped dust grains, we use the discrete dipole approximation. These cross-sections are necessary to calculate the β-ratio, which determines whether dust grains can remain gravitationally bound to their star. We calculate blowout sizes for a range of stellar spectral types corresponding with stars known to host debris disks. As with compact spheres, more luminous stars blow out larger irregularly shaped dust grains. We also find that dust grain composition influences blowout size such that absorptive grains are more readily removed from the disk. Moreover, the difference between blowout sizes calculated assuming spherical particles versus particle morphologies more representative of real dust particles is compositionally dependent as well, with blowout size estimates diverging further for transparent grains. We find that the blowout sizes calculated have a strong dependence on the particle model used, with differences in the blowout size calculated being as large as an order of magnitude for particles of similar porosities.
Publisher: Madison: The American Astronomical Society
Language: English
Identifier: ISSN: 0004-6256
ISSN: 1538-3881
EISSN: 1538-3881
DOI: 10.3847/1538-3881/ab095e
Source: Alma/SFX Local Collection

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The Effect of Dust Composition and Shape on Radiation-pressure Forces and Blowout Sizes of Particles in Debris Disks

2019. The American Astronomical Society. All rights reserved. ;Copyright IOP Publishing Apr 2019 ;ISSN: 0004-6256 ;ISSN: 1538-3881 ;EISSN: 1538-3881 ;DOI: 10.3847/1538-3881/ab095e

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