Far infrared spectral index for protoplanetary disk with porous dust
Abstract
Coagulation of small micron-size dust particles to macroscopic aggregates is considered as an important step accompanying the formation of planets in protoplanetary disks. The presence and properties of sub-millimeter dust grains should have a noticeable effect on the spectral characteristics of the disk in the far infrared part of the spectrum. In this contribution, we model the evolution of gas and dust in a protoplanetary disk and investigate how the slope of the spectrum (spectral index) in the millimeter range depends on the porosity of the dust particles within our model. For this we use the hydrodynamic code FEOSAD, which describes the dynamics of a self-gravitating disk, taking into account coagulation, fragmentation and radial drift of dust grains. We show that a notable maximum in the radial profile of the spectral index appears for compact grains and is practically absent for dust particles with a porosity of 90%, which is consistent with the results of other a!
uthors.- Publication:
-
INASAN Science Reports
- Pub Date:
- October 2019
- DOI:
- 10.26087/INASAN.2019.4.2.002
- Bibcode:
- 2019INASR...4....9A