Context. It is now generally accepted that the near-infrared excess of Herbig AeBe stars
originates in the dust of a circumstellar disk. Aims. The aims of this article are to infer the …

Many stars host planets orbiting within a few astronomical units (AU). The occurrence rate
and distributions of masses and orbits vary greatly with the host star's mass. These close …

We explore the dynamical behaviour of dust particles that populate the surface of inner
optically thick protoplanetary discs. This is a disc region with the hottest dust and is of a great …

We present near-IR (NIR) and far-UV observations of the pre-transitional (gapped) disk in
HD 169142 using NASA's Infrared Telescope Facility and Hubble Space Telescope. The …

We explore dust flow in the hottest parts of protoplanetary discs using the forces of gravity,
gas drag, and radiation pressure. Our main focus is on the optically thin regions of dusty …

Context. Despite the recent discovery of spiral-shaped features in protoplanetary discs in the
near-infrared and millimetre wavelengths, there is still an active discussion to understand …

Photophoresis is a physical process based on momentum exchange between an illuminated
dust particle and its gaseous environment. Its net effect in protoplanetary discs (PPD) is the …

Planets form in young circumstellar disks called protoplanetary disks. However, it is still
difficult to catch planet formation in situ. Nevertheless, from recent ALMA/SPHERE data …

Grain growth and fragmentation are important processes in building up large dust
aggregates in protoplanetary discs. Using a 3D two-phase (gas–dust) sph code, we …

The interaction between a YSO stellar magnetic field and its protostellar disc can result in
stellar accretional flows and outflows from the inner disc rim. Gas flows with a velocity …