Some pictograms

Artist's impressions of protoplanetary disks

These are artist's impressions of flaring protoplanetary disks (made by V. Icke using Canvas). The first (left) one depicts a purely flaring disk without inner cavity. The second (right) one depicts the disk geometry we propose for Herbig Ae/Be stars in which dust evaporation destroys the dust inward of a certain radius, leaving the opaque part of the disk with a cleared-out cavity. The inner rim of this disk puffs up and casts a shadow over part of the flaring disk.

Pictograms of the two geometries for Herbig Ae/Be star disks

These are the four pictograms from the paper by Dullemond, A&A 395, 853-862 (2002). The first two geometries are the ones that are the main types: the flared and the self-shadowed one. The third is a geometry that can appear in certain cases, in particular if dust settling sets in, but is more rate. The fourth one is a pictogram for a completely optically thin disk.

Flaring disk with inner rim:
This is the flared disk + puffed-up inner rim geometry for a disk around a Herbig Ae/Be star. This geometry is associated with the group I sources in the classification by Meeus et al. (2001).

• GIF version
• EPS version

Self-shadowed disk with inner rim:
This is the fully self-shadowed disk + puffed-up inner rim geometry for a disk around a Herbig Ae/Be star. This geometry is associated with the group II sources in the classification by Meeus et al. (2001). See paper Dullemond (2002) for more clarification.

• GIF version
• EPS version

Partially flared disk (outer disk shadowed):
Under special circumstances it can happen that the disk flares only partially, and the outer disk is shadowed by the inner flaring disk. This is expected to happen mostly in T Tauri star disks. No association with an observed kind of SED is yet given in our papers, but this may happen in the future.

• GIF version
• EPS version

Fully transparent disk ('debris disk' or 'Vega-like disk'):
When the optical depth of the disk drops below unity, one cannot anymore speak about the 'shape' of the disk as it does not have a tau=1 surface anymore. Here is the pictogram used in the paper.

• GIF version
• EPS version

IMPORTANT NOTE:
These pictograms may be used freely, but only under the condition that proper references are made to the corresponding paper.