The solid content of circumstellar disks is inherited from the interstellar medium: dust
particles of at most a micrometer in size. Protoplanetary disks are the environment where …

Interstellar interlopers are bodies formed outside of the Solar System but observed passing
through it. The first two identified interlopers, 1I/'Oumuamua and 2I/Borisov, exhibited …

The latest observation of HL Tau by ALMA revealed spectacular concentric dust rings in its
circumstellar disk. We attempt to explain the multiple ring structure as a consequence of …

Water ice is one of the most abundant materials in dense molecular clouds and in the outer
reaches of protoplanetary disks. In contrast to other materials (eg, silicates), water ice is …

Accumulation of dust and ice particles into planetesimals is an important step in the planet
formation process. Planetesimals are the seeds of both terrestrial planets and the solid cores …

Rapid orbital drift of macroscopic dust particles is one of the major obstacles to planetesimal
formation in protoplanetary disks. We re-examine this problem by considering the porosity …

Context. The sticking of micron-sized dust particles caused by surface forces within
circumstellar disks is the first stage in the production of asteroids and planets. The key …

The nucleosynthetic isotope dichotomy between carbonaceous (CC) and non-
carbonaceous (NC) meteorites has been interpreted as evidence for spatial separation and …

Context. Several barriers have been proposed in planetesimal formation theory: bouncing,
fragmentation, and radial drift problems. Understanding the structure evolution of dust …

Collisions between dust aggregates are the key to understand the formation of
planetesimals because the collision inevitably takes place in protoplanetary disks. To clarify …