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Spin-up of rubble-pile asteroids:Disruption,satellite formation,and equilibrium shapes
Asteroid, Dynamics Rotational dynamics Satellites,Dynamics
2015/12/25
We present results from numerical experiments testing the behavior of cohesionless gravitational aggregates experiencing a gradual increase of angular momentum. The test bodies used in these numerical...
Asteroids:equilibrium shapes of rotating gravitational aggregates
Asteroids shapes–Numerical simulations–Solar System evolution
2015/12/25
Many evidences lead us to think that a significant portion of asteroids are aggregates of boulders kept together by gravity, with little or no contribution from cohesive forces. The standard hydrodyna...
RUBBLE-PILE RESHAPING REPRODUCES OVERALL ASTEROID SHAPES
methods N-body simulations–minor planets asteroids–planets satellites formation–gravitation
2015/12/25
There have been attempts in the past to fit the observed bulk shapes (axial ratios) of asteroids to theoretical equilibrium figures for fluids, but these attempts have not been successful in many case...
Asteroid rotation and shapes from numerical simulations of gravitational re-accumulation
Asteroids Asteroid formation Asteroid evolution Collisions
2015/12/25
We present simulations of the gravitational collapse of a mono-disperse set of spherical particles for studying shape and spin properties of re-accumulated members of asteroid families. Previous numer...
Numerical experiments with rubble piles:equilibrium shapes and spins
Asteroids Planetesimals Rotational dynamics Solid body tides Satellites of Jupiter
2015/12/25
We present numerical experiments investigating the shape and spin limits of self-gravitating “perfect” rubble piles that consist of identical, smooth, rigid, spherical particles with configurable norm...
Four Fundamental Foreground Power Spectrum Shapes for 21 cm Cosmology Observations
Four Fundamental Foreground Power Spectrum Shapes Cosmology Observations
2012/2/24
Contamination from instrumental effects interacting with bright astrophysical sources is the primary impediment to measuring Epoch of Reionization and BAO 21 cm power spectra-an effect called mode-mix...
We develop a general theory for estimating the probability that a galaxy cluster of a given shape exists. The theory is based on the observed result that the distribution of galaxies is very close to ...
Shapes and gravitational fields of rotating two-layer Maclaurin ellipsoids: Application to planets and satellites
two-layer Maclaurin ellipsoids: Application to planets and satellites
2011/10/12
The exact solution for the shape and gravitational field of a rotating two-layer Maclaurin ellipsoid of revolution is compared with predictions of the theory of figures up to third order in the small ...
Intrinsic Shapes of Very Flat Elliptical Galaxies
Intrinsic Shapes Flat Elliptical Galaxies
2011/1/11
Photometric data from the literature is combined with triaxial mass models to derive variation in the intrinsic shapes of the light distribution of elliptical galaxies NGC 720, 2768 and 3605. The infe...
Galilean symmetry in the effective theory of inflation: new shapes of non-Gaussianity
effective theory of inflation new shapes of non-Gaussianity
2010/11/16
We study the consequences of imposing an approximate Galilean symmetry on the Effective Theory
of Inflation, the theory of small perturbations around the inflationary background. This approach allows...
Modelling the shapes of the largest gravitationally bound objects
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
2011/1/4
We combine the physics of the ellipsoidal collapse model with the excursion set theory to study the shapes of dark matter halos. In particular, we develop an analytic approximation to the nonlinear ev...
The shapes of light curves of Mira-type variables
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/31
Using a sample of 454 mira light curves from the ASAS survey we study the shape of the light variations in this kind of variable stars.
EXPERIMENTAL DIFFICULTIES IN DETERMINATION OF THE SPECTRAL LINE SHAPES EMITTED FROM PLASMA
LINE SHAPES PLASMA
2009/4/8
From the plasma radiation and from spectral line profiles it is possible
to obtain many particulars about the plasma conditions. The particulars are,
for example, concentration of the neutral or cha...