Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..414..509w&link_type=abstract
Cosmic Dust - Near and Far ASP Conference Series, Vol. 414, proceedings of a conference held 8-12 September 2008 in Heidelberg,
Astronomy and Astrophysics
Astronomy
2
Scientific paper
In recent years photophoretic forces acting on dust particles have been shown to be important for optically thin parts of protoplanetary disks. The optical surface (photosphere) of protoplanetary disks is a transitional region where the thermal radiation of the disk can escape. We show here that photophoresis by the thermal radiation is sufficient to levitate dust particles at several pressure scale heights. Under certain conditions these particles can constitute the surface layer. In this case only the particles which are most susceptible to photophoresis are observed at the surface of protoplanetary disks. In general these are small particles with low thermal conductivity, probably highly porous dust aggregates. If optical properties vary strongly for given dust aggregates the more absorbing aggregates are lifted the highest. Overall, levitation by thermal radiation introduces a bias into the observed dust. The surface dust does not necessarily reflect the properties of dust below the surface.
Haack Henning
Wurm Gerhard
No associations
LandOfFree
Levitation of Dust at the Surface of Protoplanetary Disks does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Levitation of Dust at the Surface of Protoplanetary Disks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Levitation of Dust at the Surface of Protoplanetary Disks will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1110721