Disks Around Stars and the Growth of Planetary Systems

@article{Greaves2005DisksAS,
  title={Disks Around Stars and the Growth of Planetary Systems},
  author={J. S. Greaves},
  journal={Science},
  year={2005},
  volume={307},
  pages={68 - 71}
}
  • J. Greaves
  • Published 7 January 2005
  • Physics, Geology
  • Science
Circumstellar disks play a vital evolutionary role, providing a way to move gas inward and onto a young star. The outward transfer of angular momentum allows the star to contract without breaking up, and the remnant disk of gas and particles is the reservoir for forming planets. High-resolution spectroscopy is uncovering planetary dynamics and motion within the remnant disk, and imaging at infrared to millimeter wavelengths resolves disk structure over billions of years of evolution. Most stars… 

Debris disks: seeing dust, thinking of planetesimals and planets

Debris disks are optically thin, almost gas-free dusty disks observed around a significant fraction of main-sequence stars older than about 10 Myr. Since the circumstellar dust is short-lived, the

Physics of Debris Disks

In the last decade, hundreds of debris disks around mainsequence stars have been detected through infrared excesses in the stellar spectra and some imaged directly. This review outlines essential

What Is a Planet?

  • S. Soter
  • Physics, Geology
    Scientific American
  • 2007
The proposed definition dispenses with upper and lower mass limits for a planet and reflects the tendency of disk evolution in a mature system to produce a small number of relatively large bodies (planets) in nonintersecting or resonant orbits, which prevents collisions between them.

Structure of the Kuiper Belt Dust Disk

An overview of the Kuiper belt dust disk is provided in this chapter. Mutual collisions among Kuiper belt objects should produce a dust disk in the outer solar system similar to the observed

Long-Term Collisional Evolution of Debris Disks

IR surveys indicate that the dust content in debris disks gradually declines with stellar age. We simulated the long-term collisional depletion of debris disks around solar-type (G2 V) stars with our

The Kuiper Belt and the Solar System's Comet Disk

A growing body of evidence indicates that the sculpting of the Kuiper belt region may have involved large-scale planetary migration, the presence of other rogue planetary objects in the disk, and/or the close passage of other stars in the Sun's birth cluster.

Prospects for Detection of Catastrophic Collisions in Debris Disks

We investigate the prospects for detecting dust from two-body collisions during the late stages of planet formation at 1–150 AU. We develop an analytic model to describe the formation of a dusty

Gravitationally unstable protoplanetary discs

The possibility that protoplanetary gaseous discs are dynamically unstable to axisymmetric and non-axisymmetric gravity perturbations (e.g. those produced by spontaneous disturbances) with
...

References

SHOWING 1-10 OF 38 REFERENCES

Angular Momentum Evolution of Young Stars and Disks

The effects of angular momentum play an important role in star formation. However, when a young star emerges on the Hertzsprung-Russell diagram it is generally rotating slowly. This article reviews

On the Formation Timescale and Core Masses of Gas Giant Planets

Numerical simulations show that the migration of growing planetary cores may be dominated by turbulent fluctuations in the protoplanetary disk, rather than by any mean property of the flow. We

Convective Cooling of Protoplanetary Disks and Rapid Giant Planet Formation

The rapid formation of self-gravitating clumps of gas and dust in a marginally gravitationally unstable disk requires a reasonably efficient means of cooling the disk gas. Clumps form on the

Collisional Cascades in Planetesimal Disks. II. Embedded Planets

We use a multiannulus planetesimal accretion code to investigate the growth of icy planets in the outer regions of a planetesimal disk. In a quiescent minimum-mass solar nebula, icy planets grow to

Herbig Ae/Be Stars: Intermediate-Mass Stars Surrounded by Massive Circumstellar Accretion Disks

The proposition that Herbig Ae/Be stars are young intermediate mass stars surrounded by optically thick accretion disks is explored. From a study of 47 such objects, a subset of 30 stars is

Radial Flow of Dust Particles in Accretion Disks

We study the radial migration of dust particles in accreting protostellar disks analogous to the primordial solar nebula. Our main objective is to determine the retention efficiency of dust

A Circumstellar Disk Around β Pictoris

A circumstellar disk has been observed optically around the fourth-magnitude star β Pictoris. First detected in the infrared by the Infrared Astronomy Satellite last year, the disk is seen to extend

Signatures of the Giant Planets Imprinted on the Edgeworth-Kuiper Belt Dust Disk

One method to detect extrasolar planetary systems is to deduce the perturbations of planets on the observed circumstellar dust disks. Our solar system, with its known configuration of planets,

Formation of the Giant Planets by Concurrent Accretion of Solids and Gas

New numerical simulations of the formation of the giant of the second phase. planets are presented, in which for the first time both the gas and The actual rates at which the giant planets accreted

The Kuiper Belt and the Solar System's Comet Disk

A growing body of evidence indicates that the sculpting of the Kuiper belt region may have involved large-scale planetary migration, the presence of other rogue planetary objects in the disk, and/or the close passage of other stars in the Sun's birth cluster.