Porous dust grains in debris disks
arXiv:1302.5275 · doi:10.1051/0004-6361/201220486
Abstract
When modeling the density and grain size distribution in debris disks, the minimum particle size is often significantly larger than the corresponding blowout size. While the dust particles are usually modeled as compact, homogenous spheres, we instead investigate the impact of porosity. The optical properties of porous particles are determined, and the influences of porosity on the blowout size and dust temperatures investigated. Using the method of discrete dipole approximation, we calculate the scattering and absorption cross sections of porous particles and derive the blowout size and the behavior of the dust temperature. We investigate the influence on the beta-ratio. Blowout sizes are calculated for various stellar luminosities and porosities, and an approximation equation is derived to estimate the blowout size as a function of these parameters. Furthermore, we investigate the influence of the porosity on the dust equilibrium temperature. The blowout size increases with the particle porosity and stellar luminosity. The dust temperature of porous particles is lower than the one of the compact spheres, in particular the temperature of blowout grains decreases for porous particles.
10 pages, 18 figures
References in corpus (25)
- Interstellar Dust Grains
- Scattering by Interstellar Dust Grains: Optical and Ultraviolet
- Rosseland and Planck Mean Opacities for Protoplanetary Discs
- Scattering by Interstellar Dust Grains. II. X-Rays
- Dust Properties of Protoplanetary Disks in the Taurus-Auriga Star Forming Region from Millimeter Wavelengths
- Modeling optical properties of cosmic dust grains using a distribution of hollow spheres
- Collisional Processes in Extrasolar Planetsimal Disks - Dust Clumps in Fomalhaut's Debris Disk
- Dynamical modeling of large scale asymmetries in the beta Pictoris dust disk
- Probing dust grain evolution in IM Lupi's circumstellar disc. Multi-wavelength observations and modelling of the dust disc
- Mie Scattering by Ensembles of Particles with Very Large Size Parameters
- Testing the theory of grain growth and fragmentation by millimeter observations of protoplanetary disks
- Herschel images of Fomalhaut. An extrasolar Kuiper Belt at the height of its dynamical activity
- Dust Production from collisions in extrasolar planetary systems The inner Beta-Pictoris disc
- Modelling the optical properties of composite and porous interstellar grains
- The AU Microscopii Debris Disk: Multiwavelength Imaging and Modeling
- The effect of local optically thick regions in the long-wave emission of young circumstellar disks
- Calculating Cross Sections of Composite Interstellar Grains
- Collisional and Thermal Emission Models of Debris Disks: Towards Planetesimal Population Properties
- The 9.7 and 18 um silicate absorption profiles towards diffuse and molecular cloud lines-of-sight
- Dust extinction and absorption: the challenge of porous grains
- Long-wavelength observations of debris discs around sun-like stars
- Spectral Energy Distributions of Circumstellar Debris Disks I. Analytic Disk Density Distributions
- Multi-wavelength modeling of the spatially resolved debris disk of HD 107146
- Observing planet-disk interaction in debris disks
- Diagnosing Circumstellar Debris Disks
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- Disk Radii and Grain Sizes in Herschel-Resolved Debris Disks
- Solution to the debris disc mass problem: planetesimals are born small?
- Stirring in massive, young debris discs from spatially resolved Herschel images
- The optical properties of dust: the effects of composition, size, and structure
- Collisional modelling of the AU Microscopii debris disc
- The effect of dust composition and shape on radiation-pressure forces and blowout sizes of particles in debris disks
- Intrinsic polarisation of elongated porous dust grains
- Effect of dust grain porosity on the appearance of protoplanetary disks
- Self-scattering of non-spherical dust grains
- Gas trapping of hot dust around main-sequence stars
- Interpreting the extended emission around three nearby debris disc host stars
- Discovery of Resolved Debris Disk Around HD 131835
- Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
- (Sub)millimeter Dust Polarization of Protoplanetary Disks from Scattering by Large Millimeter-Sized Irregular Grains
- Constraining the detectability of water ice in debris disks
- Impact of planetesimal eccentricities and material strength on the appearance of eccentric debris disks
- A Deep Polarimetric Study of the Asymmetrical Debris Disk HD 106906
- The influence of dust grain porosity on the analysis of debris disc observations
- Inner dusty regions of protoplanetary discs -- II. Dust dynamics driven by radiation pressure and disc winds
- Irradiation Instability at the Inner Edges of Accretion Disks
- Infrared dust arcs around the stars: I. effect of the radiation pressure
- Hot exozodis: cometary supply without trapping is unlikely to be the mechanism
- First L band detection of hot exozodiacal dust with VLTI/MATISSE
- Light Scattering and Thermal Emission by Primitive Dust Particles in Planetary Systems
- Polarization reversal of scattered thermal dust emission in protoplanetary disks at (sub-)mm wavelengths
- Dust mass in protoplanetary disks with porous dust opacities
- Mid-infrared time-domain study of recent dust production events in the extreme debris disc of TYC 4209-1322-1
- How much large dust could be present in hot exozodiacal dust systems?
- 94 Ceti: a triple star with a planet and dust disc
- Hot exozodiacal dust around Fomalhaut: The MATISSE perspective
- Abundant hydrocarbons in a buried galactic nucleus with signs of carbonaceous grain and polycyclic aromatic hydrocarbon processing
- The impact of the presence of water ice on the analysis of debris disk observations
- Resonant structures in exozodiacal clouds created by exo-Earths in the habitable zone of late-type stars