protoplanetary disk

(redirected from Circumstellar disk)
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Related to Circumstellar disk: Circumstellar disc

pro·to·plan·e·tar·y disk

A disk of gas and dust, often geometrically thin and opaque, orbiting a newly formed star, from which planets may eventually form.
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It also has a circumstellar disk of orbiting debris that appears as the numerous jagged spikes in the Hubble image.
The 47 papers also investigate dust formation around main sequence B-emission stars with large infrared excess, the centrifugal magneto-spheres of magnetic B-type stars, the density structure of 48 LibraeAEs circumstellar disk, and the origin of hard X-rays from ?
Before finding itself on the star, however, most of the cloud lands onto a circumstellar disk forming around the star owing to conservation of angular momentum.
2004) Spiral structure in the circumstellar disk around AB aurigae.
Equivalent width, the area of the spectral peak with respect to the continuum, describes the strength of the hydrogen line which allowed us to theoretically track the changes in the amount of ionized hydrogen within the circumstellar disk.
This interaction stripped away part of its circumstellar disk, leaving a tidally disrupted "arm" feature and a short truncated disk.
They cover observations and theory of circumstellar disks and outflows delta Sco and Be stars as laboratories for circumstellar disk physics, the dynamics of circumstellar material and tidal interactions, massive star formation out of a dynamic environment, and magnetospheres of hot stars.
When you have two young stars feeding from the same circumstellar disk, the gravitational influence of the secondary companion can cause hiccups, an inhibition of infalling material from the disk.
Until then, the protostar shines from the heat energy released by the gas that continues to fall onto it, much of which originates in a rotating circumstellar disk.
Even a young orb, still warm and relatively bright from its birth inside a swirling, circumstellar disk of gas and dust, is only one-hundred-thousandth to one-millionth as luminous as its parent star.
In order to understand how planets are born, astronomers are constantly on the lookout for young stars surrounded by a circumstellar disk, which, given time, can evolve into protoplanetary disks.
The change in brightness is caused not by the star itself, apparently, but by the formation, outburst, and dissipation of a circumstellar disk.