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1
Structure and Emission Properties of Accretion Disks: ...
In the regions of the disk interior to the protoplanet's orbit, these waves carry
negative angular momentum flux with respect to the local fluid. In the solar
nebula, the modest temperature contrast between the disk's midplane and
surface induces ...
2
Dynamics of Astrophysical Discs
Disc evolution and planet formation 39 & Tremaine 1982). However, the structure
of the disc in the neighbourhood of the protoplanet does depend on the
propagation speed and dissipation rate of the waves in the disc (Papaloizou &
Lin 1985) ...
Accreted planetesimals contribute angular momenta to the protoplanet when
their orbits relative to the protoplanet have a nonzero impact parameter. Accreted
gas can add prograde angular momentum to a protoplanet as a result of 3-body ...
Jay T. Bergstralh, Ellis D. Miner, Mildred Shapley Matthews, 1991
4
Dynamics of Populations of Planetary Systems (IAU C197)
The large circles indicate the protoplanet. of the system at t = 0 year and 3000
year on the a-e and a-i planes. We see that the eccentricity and inclination of the
protoplanet decrease to almost 0 in .'5000 years. However, its semimajor axis is ...
International Astronomical Union. Colloquium, Zoran Knezevic, Andrea Milani, 2005
5
Astrophysics of Planet Formation
Trajectories of test particles on almost circular orbits that encounter a protoplanet,
as viewed in the frame co-rotating with the protoplanet. In the shear dominated
regime particles whose orbits are too close to that of the protoplanet never enter ...
6
Formation and Evolution of Exoplanets
5.5.1 The Code Components The first code component computes the rate of
solids accreted onto the protoplanet. The rate is an updated version of the
classical theory of planetary growth [10] and is given as dMp dt=πR2cσFg (5.1)
where Mp is ...
Once the core mass exceeds about 0.01 M®.the temperature becomes high
enough for water to evaporate into the protoplanet's envelope. While accretion
continues, the envelope becomes more massive, and late accreting
planetesimals ...
Imke de Pater, Jack J. Lissauer, 2001
8
Issues in Astronomy and Astrophysics: 2011 Edition
“We investigate gas accretion on to a protoplanet, by considering the thermal
effect of gas in three-dimensional hydrodynamical simulations, in which the wide
region from a protoplanetary gas disc to a Jovian radius planet is resolved using
...
9
Origin of the Earth and Moon
The spiral arm discussed in the two previous figures has deposited most of the
material remaining external to the protoplanet into orbits in the vicinity of the
Roche distance and slightly beyond. This material is extensively clustered into
rubble ...
Robin M. Canup, Kevin Righter, 2000
10
Fluid Dynamics and Dynamos in Astrophysics and Geophysics
Early work on the interaction between a giant protoplanet of mass mp in circular
orbit at radius R about a central star of mass M, and a laminar protoplanetary disc
of semi-thickness H which transports angular momentum through the action of ...
Andrew M. Soward, Christopher A. Jones, David W. Hughes, 2005
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Young Earth Chomped Mercury-Like Protoplanet Resulting In …
How did the Earth came to be? Researchers are now saying that it was not the result of space rocks clumping together. Instead, the Earth ate a Mercury-like ... «Tech Times, 四月 15»
Moon formed from collision of Earth with protoplanet, scientists say
Where did the Moon come from? That question has long intrigued scientists. Various hypotheses hold that Earth, which formed some 4.5 billion years ago, either ... «Science Recorder, 四月 15»
Complex Organic Molecules Detected in Protoplanetary System …
... cousin, hydrogen cyanide (HCN), in a protoplanetary disc surrounding the young star MWC 480. Artist impression of the protoplanetary disc around MWC 480. «Sci-News.com, 四月 15»
Cosmic mystery unfolds as protoplanet Ceres shows two bright spots
NEW DELHI: A cosmic mystery is unfolding millions of kilometers away as NASA's spacecraft Dawn approaches the protoplanet Ceres. The most recent pictures ... «Times of India, 二月 15»
Dawn Spacecraft Discovers Gullies and Evidence of Water on …
NASA's Dawn spacecraft visited the protoplanet Vesta from 2011 to 2013. Now, scientists are getting a closer look at some images, and have discovered that ... «Science World Report, 一月 15»
Nasa probe Dawn's 3 billion-mile trip to end in protoplanet orbit
Nasa probe Dawn's 3 billion-mile trip to end in protoplanet orbit. Dawn will be the first probe to orbit 2 celestial bodies on a single voyage, with a mission to study ... «Livemint, 一月 15»
Vesta is not an intact protoplanet
The meteorites are ten-times enriched in trace elements and aluminum compared to ordinary chondrites; thus if they came from a chondritic protoplanet, the rest ... «Phys.Org, 十二月 14»
Beautiful Map Reveals The Evolution Of The Protoplanet Vesta
More than a million miles away from Earth, Vesta sits cold and dark in the asteroid belt between Mars and Jupiter. Depending on what naming scheme you use, ... «Popular Science, 十一月 14»
Second Possible Proto-Planet Found In System Pretty Close To Earth
This artist's conception shows a newly formed star surrounded by a swirling protoplanetary disk of dust and gas. Credit: University of Copenhagen/Lars ... «Universe Today, 九月 14»
New Evidence for Protoplanet Theia Found in Moon Rocks
A study published in the journal Science provides new evidence that the Moon formed from the catastrophic collision of the proto-Earth with a hypothetical ... «Sci-News.com, 六月 14»
