We obtain flux ratios of hydrogen lines for these stars, finding that they have optically thin envelopes, except by 66 Oph and θ CrB, which do not show evidence of a circumstellar disk. γ Cas and ϕ ...

The gravitational collapse of rotating, denser-than-average "cores" within a molecular cloud results in the creation of a central protostar surrounded by a flattened spinning disk of gaseous material, ...

Over the past 20 years, astronomers have been studying a massive, 100 billion-mile-wide (161 billion kilometers) circumstellar disk of dust and gas surrounding Vega, similar to the protoplanetary ...

Simulations show that these objects could form during violent collisions between circumstellar disks around young stars. These collisions, occurring at impressive speeds, create bridges of matter that ...

The star resides in a complex circumstellar environment, which includes a circumstellar disk, accretion streamers, jets and outflows. Previous observations of T CrA have suggested that it may be a ...

This image, acquired by the Subaru Telescope and its HiCIAO instrument, is the first to show spiral arms in a circumstellar disk. The disk itself is some 14 billion miles across, or about twice ...

Why PMOs are unique PMOs form along stars, inheriting material from the outer edges of circumstellar disks. PMOs move in synchrony with the stars in their host cluster, unlike ejected planets.