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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…

Earth and Planetary Astrophysics · Physics 2012-12-10 Eiichiro Kokubo , Shigeru Ida

I discuss the role that disc fragmentation plays in the formation of gas giant and terrestrial planets, and how this relates to the formation of brown dwarfs and low-mass stars, and ultimately to the process of star formation. Protostellar…

Earth and Planetary Astrophysics · Physics 2015-06-15 Dimitris Stamatellos

In the core accretion scenario of planet formation, rocky cores grow by first accreting solids until they are massive enough to accrete gas. For giant planet formation this means that a massive core must form within the lifetime of the gas…

Earth and Planetary Astrophysics · Physics 2023-06-21 Andrin Kessler , Yann Alibert

Recent work has shown that aside from the classical view of collisions by increasingly massive planetesimals, the accretion of mm- to m-sized 'pebbles' can also reproduce the mass-orbit distribution of the terrestrial planets. Here, we…

Earth and Planetary Astrophysics · Physics 2022-02-09 J. Mah , R. Brasser , A. Bouvier , S. J. Mojzsis

Planets are a natural byproduct of the stellar formation process, resulting from local aggregations of material within the disks surrounding young stars. Whereas signatures of gas-giant planets at large orbital separations have been…

It is reasonable to assume that the structure of a planet and the interior distribution of its components are determined by its formation history. We thus follow the growth of a planet from a small embryo through its subsequent evolution.…

Earth and Planetary Astrophysics · Physics 2022-08-03 Michael Lozovsky , Dina Prialnik , Morris Podolak

Planet formation remains a fundamentally important yet poorly understood process. Protoplanetary disks, the birthplaces of planetary systems, exhibit a wide range of substructures that are increasingly interpreted as signatures of…

Earth and Planetary Astrophysics · Physics 2026-04-13 Gabriele Cugno , Michael R. Meyer

We present a plausible and coherent view of the evolution of the protosolar disk that is consistent with the cosmochemical constraints and compatible with observations of other protoplanetary disks and sophisticated numerical simulations.…

Most analytic work to date on protostellar disks has focused on those in isolation from their environments. However, observations are now beginning to probe the earliest, most embedded phases of star formation, during which disks are…

Astrophysics · Physics 2009-11-13 Kaitlin M. Kratter , Christopher D. Matzner , Mark R. Krumholz , .

Using numerical hydrodynamics simulations we studied the gravitational collapse of pre-stellar cores of sub-solar mass embedded into a low-density external environment. Four models with different magnitude and direction of rotation of the…

Solar and Stellar Astrophysics · Physics 2015-06-23 Eduard I. Vorobyov , D. N. C. Lin , Manuel Guedel

Planet formation occurs over a few Myr within protoplanetary discs of dust and gas, which are often assumed to evolve in isolation. However, extended gaseous structures have been uncovered around many protoplanetary discs, suggestive of…

Earth and Planetary Astrophysics · Physics 2024-08-09 Andrew J. Winter , Myriam Benisty , Sean M. Andrews

Protoplanetary disks dissipate rapidly after the central star forms, on time-scales comparable to those inferred for planet formation. In order to allow the formation of planets, disks must survive the dispersive effects of UV and X-ray…

Earth and Planetary Astrophysics · Physics 2019-01-24 U. Gorti , R. Liseau , Zs. Sandor , C. Clarke

A stunning range of substructures in the dust of protoplanetary disks is routinely observed across a range of wavelengths. These gaps, rings and spirals are highly indicative of a population of unseen planets, hinting at the possibility of…

Planet-disk interaction predicts a change in the orbital elements of an embedded planet. Through linear and fully hydrodynamical studies it has been found that migration is typically directed inwards. Hence, this migration process gives…

Earth and Planetary Astrophysics · Physics 2015-05-27 Willy Kley

We review advances in the modeling of protoplanetary disks. This review will focus on the regions of the disk beyond the dust sublimation radius, i.e. beyond 0.1 - 1 AU, depending on the stellar luminosity. We will be mostly concerned with…

Astrophysics · Physics 2007-05-23 C. P. Dullemond , D. Hollenbach , I. Kamp , P. D'Alessio

We present numerical simulations of terrestrial planet formation that examine the growth continuously from planetesimals to planets in the inner Solar System. Previous studies show that the growth will be inside-out, but it is still common…

Earth and Planetary Astrophysics · Physics 2019-08-05 Kevin J. Walsh , Harold F. Levison

The discovery of planets in close orbits around binary stars raises questions about their formation. It is believed that these planets formed in the outer regions of the disc and then migrated through planet-disc interaction to their…

Earth and Planetary Astrophysics · Physics 2018-08-17 Daniel Thun , Wilhelm Kley

Planets are formed inside disks around young stars. The gas, dust, and ice in these natal disks are the building materials of planets, and therefore their compositions fundamentally shape the final chemical compositions of planets. In this…

Earth and Planetary Astrophysics · Physics 2024-04-25 Ke Zhang

Detections of planets in eccentric, close (separations of ~20 AU) binary systems such as \alpha Cen or \gamma Cep provide an important test of planet formation theories. Gravitational perturbations from the companion are expected to excite…

Earth and Planetary Astrophysics · Physics 2016-08-31 Kedron Silsbee , Roman R. Rafikov

A planet is formed within a protoplanetary disk. Recent observations have revealed substructures such as gaps and rings, which may indicate forming planets within the disk. Due to disk--planet interaction, the planet migrates within the…

Earth and Planetary Astrophysics · Physics 2020-04-08 Kazuhiro D. Kanagawa , Hideko Nomura , Takashi Tsukagoshi , Takayuki Muto , Ryohei Kawabe