circumstellar disk


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circumstellar disk

[‚sər·kəm¦stel·ər ′disk]
(astronomy)
A flattened cloud of gas or small particles that undergoes approximately circular motion about a star, and in which the material velocity is determined primarily by the balance of gravity and centrifugal force.
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(2012) High-resolution near-infrared polarimetry of a circumstellar disk around UX Tau A.
Sargent, "The dusty circumstellar disks of B[e] supergiants in the Magellanic Clouds," The Astronomical Journal, vol.
Both the star and its circumstellar disk possess magnetic fields.
[1] The disc and planet images and the planet's spectrum have been captured in the course of the two survey programmes called SHINE (SpHere INfrared survey for Exoplanets) and DISK (sphere survey for circumstellar DISK).
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.
This term depicts a special class of protoplanetary disk, resulting from the evolution of a circumstellar disk in the presence of ionizing radiation from massive OB-type stars, and was coined by O'Dell and collaborators [26] to describe the silhouette and tear-drop shaped objects observed in the first imaging studies of the Orion Nebula using the Hubble Space Telescope (HST).
One important consideration for planetary formation is the dispersal rate of the circumstellar disk of gas and dust around a host star.
The findings support the notion that at least some massive stars form as their smaller siblings do, by packing on infalling material from a circumstellar disk. This accretion process creates and sustains disks and narrow jets, whereas mergers destroy disks and spew only diffuse jets, if any, comments Barbara Whitney of the Space Telescope Science Institute in Boulder, Colo.
The observations, made using Hubble's imaging spectrograph and the Near Infrared Camera and Multi-Object Spectrometer (NICMOS), revealed a shadow sweeping across the circumstellar disk. This shadow across the surface of the outer disk, the researchers said, is being cast by gravitationally pulled material in the inner part of the disk.
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.
After we ruled out the eclipse being due to a spherical star or a circumstellar disk passing in front of the star, I realized that the only plausible explanation was some sort of dust ring system orbiting a smaller companion-basically a 'Saturn on steroids,'" said Mamajek.