Results 21 to 30 of about 3,499 (221)

Gravoturbulent Formation of Planetesimals [PDF]

The Astrophysical Journal, 2006
We explore the effect of magnetorotational turbulence on the dynamics and concentrations of boulders in local box simulations of a sub-Keplerian protoplanetary disc. The solids are treated as particles each with an independent space coordinate and velocity. We find that the turbulence has two effects on the solids.
Johansen, Anders, Klahr, Hubert, Henning, Thomas   +2 more
openaire   +2 more sources

Dynamics and accretion of planetesimals [PDF]

Progress of Theoretical and Experimental Physics, 2012
We review the basic dynamics and accretion of planetesimals by showing N-body simulations. The orbits of planetesimals evolve through two-body gravitational relaxation: viscous stirring increases the random velocity and dynamical friction realizes the equiparation of the random energy.
Kokubo, Eiichiro, Ida, Shigeru
openaire   +2 more sources

Planets in Binaries: Formation and Dynamical Evolution

Galaxies, 2019
Binary systems are very common among field stars, yet the vast majority of known exoplanets have been detected around single stars. While this relatively small number of planets in binaries is probably partly due to strong observational biases, there is,
Francesco Marzari, Philippe Thebault
doaj   +1 more source

Rapid Formation of Gas-giant Planets via Collisional Coagulation from Dust Grains to Planetary Cores. II. Dependence on Pebble Bulk Density and Disk Temperature

The Astrophysical Journal, 2023
Thanks to “dust-to-planet” simulations (DTPSs), which treat the collisional evolution directly from dust to giant-planet cores in a protoplanetary disk, we showed that giant-planet cores are formed in ≲10 au in several 10 ^5 yr, because porous pebbles ...
Hiroshi Kobayashi, Hidekazu Tanaka
doaj   +1 more source

Possible Ribose Synthesis in Carbonaceous Planetesimals

Life, 2022
The origin of life might be sparked by the polymerization of the first RNA molecules in Darwinian ponds during wet-dry cycles. The key life-building block ribose was found in carbonaceous chondrites.
Klaus Paschek, Kai Kohler, Ben K. D. Pearce, Kevin Lange, Thomas K. Henning, Oliver Trapp, Ralph E. Pudritz, Dmitry A. Semenov   +7 more
doaj   +1 more source

Multiwavelength Transit Observations of the Candidate Disintegrating Planetesimals Orbiting WD 1145+017 [PDF]

, 2016
We present multiwavelength, ground-based follow-up photometry of the white dwarf WD 1145+017, which has recently been suggested to be orbited by up to six or more short-period, low-mass, disintegrating planetesimals.
Johnson, John Asher, Rappaport, Saul, Dalba, Paul A., Allyson Bieryla, John DeVore, Latham, David W., Jason T. Wright, Wittenmyer, Robert A., Beatty, Thomas G., Rappaport, Saul A, Saul Rappaport, McCrady, Nate, DeVore, John, Andrew Vanderburg, Eastman, Jason, Wright, Jason T., Thomas G. Beatty, Robert A. Wittenmyer, Muirhead, Philip S., Bieryla, Allyson, Philip S. Muirhead, De Vore, John, Bryce Croll, David W. Latham, Croll, Bryce, Jason Eastman, Paul A. Dalba, Vanderburg, Andrew, Eunkyu Han, John Asher Johnson, Han, Eunkyu, Nate McCrady   +31 more
core   +1 more source

PLANETESIMAL DISK MICROLENSING [PDF]

The Astrophysical Journal, 2009
Motivated by debris disk studies, we investigate the gravitational microlensing of background starlight by a planetesimal disk around a foreground star. We use dynamical survival models to construct a plausible example of a planetesimal disk and study its microlensing properties using established ideas of microlensing by small bodies. When a solar-type
Heng, Kevin, Keeton, Charles R.
openaire   +2 more sources

Binary Formation in Planetesimal Disks. I. Equal Mass Planetesimals [PDF]

Publications of the Astronomical Society of Japan, 2011
As of April 2010, 48 TNO (trans-Neptunian Object) binaries have been found. This is about 6% of known TNOs. However, in previous theoretical studies of planetary formation in the TNO region, the effect of binary formation has been neglected. TNO binaries can be formed through a variety of mechanisms, such as a three-body process, dynamical friction on ...
Daisaka, Junko K., Makino, Junichiro, Daisaka, Hiroshi   +2 more
openaire   +2 more sources

Formation of Comets

Universe, 2022
Questions regarding how primordial or pristine the comets of the solar system are have been an ongoing controversy. In this review, we describe comets’ physical evolution from dust and ice grains in the solar nebula to the contemporary small bodies in ...
Jürgen Blum, Dorothea Bischoff, Bastian Gundlach   +2 more
doaj   +1 more source

Planetesimal Population Synthesis: Pebble Flux-regulated Planetesimal Formation [PDF]

The Astrophysical Journal, 2019
Abstract We propose an expression for a local planetesimal formation rate proportional to the instantaneous radial pebble flux. The result—a radial planetesimal distribution—can be used as an initial condition to study the formation of planetary embryos.
Christian T. Lenz, Hubert Klahr, Tilman Birnstiel   +2 more
openaire   +3 more sources