protoplanetary disk

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

pro·to·plan·e·tar·y disk

 (prō′tō-plăn′ĭ-tĕr′ē)
n.
A disk of gas and dust, often geometrically thin and opaque, orbiting a newly formed star, from which planets may eventually form.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Their observations confirm that the salty regions trace the location of the circumstellar disk.
The dark region at the centre of the image is due to a coronagraph, a mask which blocks the blinding light of the central star and allows astronomers to detect its much fainter disc (rotating circumstellar disk of dense gas and dust surrounding a young newly formed star) and its planetary companion.
It also has a circumstellar disk of orbiting debris that appears as the numerous jagged spikes in the Hubble image.
G., "Resolving the Circumstellar Disk of HL Tauri at Millimeter Wavelengths", ApJ, 741, 1, id.
(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. We show that there is a direct correlation between the equivalent widths and the apparent visual magnitude of Delta Scorpius.
Andruchow et al., "Observational constraints for the circumstellar disk of the B[e] star CPD-52 9243," Astronomy & Astrophysics, vol.
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.