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The discovery of thousands of exoplanets over the last couple of decades has shown that the birth of planets is a very efficient process in nature. Theories invoke a multitude of mechanisms to describe the assembly of planets in the disks…

We present numerical simulations of dust clumping and planetesimal formation initiated by the streaming instability with self-gravity. We examine the variability in the planetesimal formation process by employing simulation domains with…

Earth and Planetary Astrophysics · Physics 2020-11-04 Josef Rucska , James Wadsley

We review the problem of the formation of terrestrial planets, with particular emphasis on the interaction of dynamical and geochemical models. The lifetime of gas around stars in the process of formation is limited to a few million years…

Earth and Planetary Astrophysics · Physics 2009-06-25 Jonathan I. Lunine , David P. O'Brien , Sean N. Raymond , Alessandro Morbidelli , Thomas Quinn , Amara Graps

Circumstellar disks are an integral part of the star formation process and the sites where planets are formed. Understanding the physical processes that drive their evolution, as disks evolve from optically thick to optically thin, is…

Astrophysics · Physics 2016-09-08 Lucas A. Cieza

Water content and the internal evolution of terrestrial planets and icy bodies are closely linked. The distribution of water in planetary systems is controlled by the temperature structure in the protoplanetary disk and dynamics and…

Earth and Planetary Astrophysics · Physics 2018-02-21 Julien Monteux , Gregor J. Golabek , David C. Rubie , Gabriel Tobie , Edward D. Young

(English) In this lecture I discuss recent progress in the understanding of the chemical evolution of protoplanetary disks that resemble our Solar system during the first ten million years. At the verge of planet formation, strong…

Astrophysics of Galaxies · Physics 2012-02-27 Dmitry A. Semenov

Planetesimal formation stage represents a major gap in our understanding of the planet formation process. The late-stage planet accretion models typically make arbitrary assumptions about planetesimals and pebbles distribution while the…

Earth and Planetary Astrophysics · Physics 2017-12-13 Joanna Drazkowska , Yann Alibert

The formation of a star is a dynamic process fed by the gravitational collapse of a molecular cloud core. Theoretical models and observations suggest that the majority of this infalling material settles into a protoplanetary disk before…

Astrophysics of Galaxies · Physics 2017-12-08 Doug Johnstone

Giant planets can interact with multiple and chemically diverse environments in protoplanetary discs while they form and migrate to their final orbits. The way this interaction affects the accretion of gas and solids shapes the chemical…

We present results from 42 simulations of late stage planetary accretion, focusing on the delivery of volatiles (primarily water) to the terrestrial planets. Our simulations include both planetary "embryos" (defined as Moon to Mars sized…

Astrophysics · Physics 2014-10-13 Sean N. Raymond , Thomas R. Quinn , Jonathan I. Lunine

The origin of planetesimals ($\sim$100 km planet building blocks) has confounded astronomers for decades, as numerous growth barriers appear to impede their formation. In a recent paper we proposed a novel interaction where the streaming…

Earth and Planetary Astrophysics · Physics 2025-09-03 Daniel Carrera , Linn E. J. Eriksson , Jeonghoon Lim , Wladimir Lyra , Jacob B. Simon

Atmospheric compositions for rocky exoplanets will depend strongly on the bulk planetary composition and the orbital position of the planet. Non-traditional gases may be present in the atmospheres of exceptionally hot planets. Atmospheres…

Earth and Planetary Astrophysics · Physics 2021-08-20 Laura Schaefer , Vivien Parmentier

This review chapter for young researchers presents our current understanding of debris discs. It introduces some of their basic properties and observables, and describes how we think they form and collisionally evolve. Special emphasis is…

Earth and Planetary Astrophysics · Physics 2022-02-15 Sebastian Marino

The disks that orbit young stars are the essential conduits and reservoirs of material for star and planet formation. Their structures, meaning the spatial variations of the disk physical conditions, reflect the underlying mechanisms that…

Earth and Planetary Astrophysics · Physics 2020-11-11 Sean M. Andrews

One of the main evolutionary stages of planet formation is the dynamical evolution of planetesimal disks. These disks are thought to evolve through gravitational encounters and physical collisions between single planetesimals. In recent…

Earth and Planetary Astrophysics · Physics 2015-05-20 Hagai B. Perets

I review the processes that shape the evolution of protoplanetary discs around young, solar-mass stars. I first discuss observations of protoplanetary discs, and note in particular the constraints these observations place on models of disc…

Astrophysics · Physics 2008-11-26 Richard Alexander

As planets form and grow within gaseous protoplanetary disks, the mutual gravitational interaction between the disk and planet leads to the exchange of angular momentum, and migration of the planet. We review current understanding of…

Earth and Planetary Astrophysics · Physics 2015-06-04 W. Kley , R. P. Nelson

Accumulation of dust and ice particles into planetesimals is an important step in the planet formation process. Planetesimals are the seeds of both terrestrial planets and the solid cores of gas and ice giants forming by core accretion.…

Earth and Planetary Astrophysics · Physics 2015-06-18 Anders Johansen , Jürgen Blum , Hidekazu Tanaka , Chris Ormel , Martin Bizzarro , Hans Rickman

Here we discuss the current state of knowledge on how atmospheric escape processes can fractionate noble gas isotopes and moderately volatile rock-forming elements that populate primordial atmospheres, magma ocean related environments, and…

Direct observations of gaseous exoplanets reveals that their gas envelope is commonly enriched in C/O ratio compared to that of the host star. This has been explained by considering that the gas phase of the disc could be inhomogeneous,…

Earth and Planetary Astrophysics · Physics 2015-02-11 Thiabaud Amaury , Marboeuf Ulysse , Alibert Yann , Leya Ingo , Mezger Klaus