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The orbital parameters of the observed extrasolar planets differ strongly from those of our own solar system. The differences include planets with high masses, small semi-major axis and large eccentricities. We performed numerical…

Astrophysics · Physics 2007-05-23 Wilhelm Kley

In this paper, we investigate how external photo-evaporation influences the formation, dynamical evolution and the resultant planetary architecture of multi-planet systems born in stellar clusters. We use a model of N-body simulations of…

Earth and Planetary Astrophysics · Physics 2026-01-08 Lin Qiao , Gavin A. L. Coleman , Thomas J. Haworth

Protoplanetary disks are the birthplaces of planetary systems. The evolution of the star-disk system and the disk chemical composition determines the initial conditions for planet formation. Therefore a comprehensive understanding of the…

Earth and Planetary Astrophysics · Physics 2016-12-21 Ch. Rab , C. Baldovin-Saavedra , O. Dionatos , E. Vorobyov , Manuel Güdel

We review the state of the field of terrestrial planet formation with the goal of understanding the formation of the inner Solar System and low-mass exoplanets. We review the dynamics and timescales of accretion from planetesimals to…

Earth and Planetary Astrophysics · Physics 2015-06-18 Sean N. Raymond , Eiichiro Kokubo , Alessandro Morbidelli , Ryuji Morishima , Kevin J. Walsh

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

Planet-disk interactions, where an embedded massive body interacts gravitationally with the protoplanetary disk it was formed in, can play an important role in reshaping both the disk and the orbit of the planet. Spiral density waves are…

Earth and Planetary Astrophysics · Physics 2022-11-09 Sijme-Jan Paardekooper , Ruobing Dong , Paul Duffell , Jeffrey Fung , Frederic S. Masset , Gordon Ogilvie , Hidekazu Tanaka

Context. The classical "planetesimal" accretion scenario for the formation of planets has recently evolved with the idea that "pebbles", centimeter- to meter-sized icy grains migrating in protoplanetary disks, can control planetesimal…

Earth and Planetary Astrophysics · Physics 2016-06-22 Shigeru Ida , Tristan Guillot , Alessandro Morbidelli

The standard model for planet formation is a bottom-up process in which the origin of rocky and gaseous planets can be traced back to the collision of micron-sized dust grains within the gas-rich environment of protoplanetary disks. Key…

Earth and Planetary Astrophysics · Physics 2025-04-14 Philip J. Armitage

We explore in situ formation and subsequent evolution of close-in super-Earths and mini-Neptunes. We adopt a steady-state inner protoplanetary gas disc structure that arises from viscous accretion due to the magneto-rotational instability…

Solar and Stellar Astrophysics · Physics 2019-01-16 Marija R. Jankovic , James E. Owen , Subhanjoy Mohanty

Recent observations have suggested that circumstellar disks may commonly form around young stellar objects. Although the formation of circumstellar disks can be a natural result of the conservation of angular momentum in the parent cloud,…

This review addresses the state of research that employs astronomical (remote sensing) observations of solids ("dust") in young circumstellar disks to learn about planet formation. The intention is for it to serve as an accessible,…

Solar and Stellar Astrophysics · Physics 2016-03-09 Sean M. Andrews

A detailed understanding of the physics of star and planet formation requires study of individual objects as well as statistical assessment of global properties and evolutionary trends. Observational investigations of circumstellar material…

Astrophysics · Physics 2007-05-23 Lynne A. Hillenbrand

Recent detailed observations of protoplanetary discs revealed a lot of sub-structures which are mostly ring-like. One interpretation is that these rings are caused by growing planets. These potential planets are not yet opening very deep…

Earth and Planetary Astrophysics · Physics 2019-07-17 Nelson Ndugu , Bertram Bitsch , Edward Jurua

The discovery of now about 20 extrasolar planets orbiting solar-type stars with properties quite different from those in our Solar System has raised many questions about the formation and evolution of planets. The tidal interaction between…

Astrophysics · Physics 2007-05-23 Willy Kley

The recent discoveries of circumbinary planets by $\it Kepler$ raise questions for contemporary planet formation models. Understanding how these planets form requires characterizing their formation environment, the circumbinary…

Earth and Planetary Astrophysics · Physics 2016-10-20 David P. Fleming , Thomas R. Quinn

The study of protoplanetary disc evolution and planet formation has mainly concentrated on solar (and low) mass stars since they host the majority of the confirmed exoplanets. Nevertheless, the numerous planets found orbiting stars up to…

Earth and Planetary Astrophysics · Physics 2023-11-08 María Paula Ronco , Matthias R. Schreiber , Eva Villaver , Octavio M. Guilera , Marcelo M. Miller Bertolami

We develop a simple model of planetary formation, focusing our attention on those planets with masses less than 10 Earth masses and studying particularly the primordial spin parameters of planets resulting from the accretion of…

Earth and Planetary Astrophysics · Physics 2015-05-18 Yamila Miguel , Adrián Brunini

Exoplanets around different types of stars provide a window into the diverse environments in which planets form. This chapter describes the observed relations between exoplanet populations and stellar properties and how they connect to…

Earth and Planetary Astrophysics · Physics 2024-03-06 Gijs D. Mulders

We study the evolution of a system consisting of two protoplanets still embedded in a protoplanetary disk. Results of two different numerical approaches are presented. In the first kind of model the motion of the disk material is followed…

Astrophysics · Physics 2023-07-19 Willy Kley

Over the past decade, advancement of observational capabilities, specifically the Atacama Large Millimeter/submillimeter Array (ALMA) and SPHERE instrument, alongside theoretical innovations like pebble accretion, have reshaped our…

Earth and Planetary Astrophysics · Physics 2024-09-30 Tilman Birnstiel