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Swirling around the planet’s equator, the rings of Saturn are a dead giveaway that the planet is spinning at a tilt. The belted giant rotates at a 26.7-degree angle relative to the plane in which it o...
Rings around young star suggest planet formation in progress
Rings around young star planet formati progress
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2016/12/27
Rice University astronomers and their colleagues have for the first time mapped gases in three dark rings around a distant star. The rings mark spaces where planets are thought to have formed from dus...
N-body simulations of cohesion in dense planetary rings:A study of cohesion parameters
Planetary rings Saturn, Rings Tides, Solid body Ices, Mechanical properties Collisional physics
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2015/12/25
We present results from a large suite of simulations of Saturn’s dense A and B rings using a new model of particle sticking in local simulations (Perrine, R.P., Richardson, D.C., Scheeres, D.J. [2011]...
A numerical model of cohesion in planetary rings
Planetary rings Saturn, Rings Rotational dynamics Tides, Solid body Ices, Mechanical properties Collisional physics
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2015/12/25
We present a numerical method that incorporates particle sticking in simulations using the N-body code pkdgrav to study motions in a local rotating frame, such as a patch of a planetary ring. Particle...
AN ANALYTIC PARAMETERIZATION OF SELF-GRAVITY WAKES IN SATURN’S RINGS, WITH APPLICATION TO OCCULTATIONS AND PROPELLERS
planets and satellites individual (Saturn)–planets and satellites rings
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2015/12/25
We have developed a semianalytic method of parameterizing N-body simulations of self-gravity wakes in Saturn’s rings, describing their photometric properties by means of only six numbers: three optica...
Nuclear Rings in Galaxies---A Kinematic Perspective
Nuclear Rings Galaxies---A Kinematic Perspective
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2011/10/19
We combine DensePak integral field unit and TAURUS Fabry-Perot observations of 13 nuclear rings to show an interconnection between the kinematic properties of the rings and their resonant origin. The ...
The Halo and Rings of the Planetary Nebula NGC 40 in the Mid-Infrared
the Planetary Nebula NGC 40 the Mid-Infrared
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2011/1/10
We present imaging and spectroscopy of NGC 40 acquired using the Spitzer Space Telescope (Spitzer), and the Infrared Space observatory (ISO). These are used to investigate the nature of emission from ...
Formation of a two-dense-rings-pattern disk from the collapse of a cloud
two-dense-rings-pattern disk cloud
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2009/7/9
Formation of a two-dense-rings-pattern disk from the collapse of a cloud。
The formation of collimated outflows and concentric rings in magnetized Planetary Nebulae
outflows magnetized Planetary Nebulae
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2009/6/11
The formation of collimated outflows and concentric rings in magnetized Planetary Nebulae。
Collisional Planetary Rings：The Role of the Width and the Optical Depth
Collisional Planetary Rings Width Optical Depth
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2009/6/5
Collisional Planetary Rings：The Role of the Width and the Optical Depth。