2013A&A...552A..54K


Query : 2013A&A...552A..54K

2013A&A...552A..54K - Astronomy and Astrophysics, volume 552A, 54-54 (2013/4-1)

Porous dust grains in debris disks.

KIRCHSCHLAGER F. and WOLF S.

Abstract (from CDS):

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 determine the efficiency factors of absorption and the radiation pressure for porous particles, and investigate the influence on the β-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.

Abstract Copyright:

Journal keyword(s): circumstellar matter - protoplanetary disks - infrared: stars - interplanetary medium - scattering

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 HD 377 PM* 00 08 25.7454555168 +06 37 00.489407808   8.22 7.59   6.90 G2V 130 0
2 HD 8907 PM* 01 28 34.3596466296 +42 16 03.688114260   7.15 6.66     F8 84 0
3 HD 61005 PM* 07 35 47.4623556456 -32 12 14.045086368   8.96 8.22     G8Vk 198 0
4 HD 104860 PM* 12 04 33.7308619800 +66 20 11.712857172   8.50 7.91     G0/F9V 84 0
5 HD 107146 PM* 12 19 06.5018840304 +16 32 53.867731128   7.61   6.7   G2V 251 0
6 HD 109573 PM* 12 36 01.0317461592 -39 52 10.220465388   5.786 5.774 7.25 5.81 A0V 594 1
7 THA 15-12 Or* 15 56 09.2066646912 -37 56 06.126118692   13.12 11.93 11.45   M0e 345 0
8 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 203 0
9 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 121 0
10 HD 191089 PM* 20 09 05.2156358688 -26 13 26.520165768   7.62 7.18     F5V 133 0
11 V* AU Mic LM* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1012 0
12 * alf PsA ** 22 57 39.04625 -29 37 20.0533 1.31 1.25 1.16 1.11 1.09 A4V 1185 3

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2022.08.09-02:51:17

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