Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-06-26
Astronomy and Astrophysics
Astrophysics
13 pages, accepted by Astronomy and Astrophysics
Scientific paper
We investigate in details the properties of the disk surrounding the 8 Myr old star HR 4796A, one of the few stars bringing precious clues to better understand the scenario which lead to planetary system formation. We propose a model able to reproduce all the available observations : the full spectral energy distribution from the mid-infrared to the millimeter wavelengths, resolved scattered light and thermal emission observations. We show that the circumstellar matter splits into two dust components : a cold annulus, peaked at 70 AU from the star, made of ISM-like grains (amorphous composition, porosity ~ 0.6) larger than 10 microns and a population of hot dust close to the star (at about 9 AU) made of comet-like grains (crystalline composition, porosity ~ 0.97). Both dust populations are highly collisional and the grain size distribution in the cold annulus is found to be cut-off by radiation pressure. At 70 AU, bodies as large as a few meters are required to fit the data leading to a minimum disk mass of a few Earth masses and to a gas to dust ratio less than 1. We discuss aftewards some implications on the disk structure and effects of larger bodies.
Augereau J.-Ch.
Grorod P. A.
Lagrange Anne Marie
Mouillet David
Papaloizou John C. B.
No associations
LandOfFree
On the HR 4796A circumstellar disk 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 On the HR 4796A circumstellar disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the HR 4796A circumstellar disk will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-60736