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[Abridged] Star and planet formation are the complex outcomes of gravitational collapse and angular momentum transport mediated by protostellar and protoplanetary disks. In this review we focus on the role of gravitational instability in…

Solar and Stellar Astrophysics · Physics 2016-10-05 Kaitlin M. Kratter , Giuseppe Lodato

Protoplanetary disks composed of dust and gas are ubiquitous around young stars and are commonly recognized as nurseries of planetary systems. Their lifetime, appearance, and structure are determined by an interplay between stellar…

Over the past decade, progress in observational capabilities, combined with theoretical advancements, have transformed our comprehension of the physics and chemistry during planet formation. Despite these important steps forward, open…

Solar and Stellar Astrophysics · Physics 2024-07-08 G. Perotti , L. Cacciapuoti , N. -D. Tung , T. Grassi , E. Schisano , L. Testi

Global models of planet formation tend to begin with an initial set of planetary embryos for the sake simplicity. While this approach gives valuable insights on the evolution of the initial embryos, the initial distribution itself is a bold…

Earth and Planetary Astrophysics · Physics 2022-10-26 Oliver Voelkel , Hubert Klahr , Christoph Mordasini , Alexandre Emsenhuber

The building of planetary systems is controlled by the gas and dust dynamics of protoplanetary disks. While the gas is simultaneously accreted onto the central star and dissipated away by winds, dust grains aggregate and collapse to form…

Knowledge of the composition of material that will form planets is crucial to understand planetary diversity and the occurrence of potentially habitable planets. Ultimately, it is the chemistry in circumstellar disks that determines the…

Earth and Planetary Astrophysics · Physics 2024-10-31 Merel L. R. van 't Hoff , Jennifer B. Bergner

Formation of terrestrial planets by agglomeration of planetesimals in protoplanetary disks sensitively depends on the velocity evolution of planetesimals. We describe a novel semi-analytical approach to the treatment of planetesimal…

Astrophysics · Physics 2007-05-23 Roman R. Rafikov

This paper provides a brief summary and overview of the astrochemistry associated with the formation of stars and planets. It is aimed at new researchers in the field to enable them to obtain a quick overview of the landscape and key…

Earth and Planetary Astrophysics · Physics 2020-12-04 Ewine F. van Dishoeck , Edwin A. Bergin

Understanding the origin and long-term evolution of the Solar System is a fundamental goal of planetary science and astrophysics. This chapter describes our current understanding of the key processes that shaped our planetary system,…

Earth and Planetary Astrophysics · Physics 2024-04-24 Sean N. Raymond

Earth-mass planets are expected to have atmospheres and experience thermal tides raised by the host star. These tides transfer energy to the planet that can counter the dissipation from bodily tides. Indeed, even a relatively thin…

Earth and Planetary Astrophysics · Physics 2023-12-13 Ema F. S. Valente , Alexandre C. M. Correia

Protoplanetary disks are the sites of planet formation, and the evolution and eventual dispersal of these disks strongly influences the formation of planetary systems. Disk evolution during the planet-forming epoch is driven by accretion…

Earth and Planetary Astrophysics · Physics 2015-06-17 Richard Alexander , Ilaria Pascucci , Sean Andrews , Philip Armitage , Lucas Cieza

As part of a national scientific network 'Pathways to Habitability' the formation of planets and the delivery of water onto these planets is a key question as water is essential for the development of life. In the first part of the paper we…

Earth and Planetary Astrophysics · Physics 2015-02-11 Rudolf Dvorak , Thomas I. Maindl , Christoph Burger , Christoph Schäfer , Roland Speith

The formation of planets with gaseous envelopes takes place in protoplanetary accretion discs on time-scales of several millions of years. Small dust particles stick to each other to form pebbles, pebbles concentrate in the turbulent flow…

Earth and Planetary Astrophysics · Physics 2015-02-25 Bertram Bitsch , Anders Johansen , Michiel Lambrechts , Alessandro Morbidelli

Past studies have revealed the dependency of the disc parameters (mass, radius, viscosity, grain fragmentation velocity, dust-to-gas ratio) on the formation of giant planets, where more massive discs seem beneficial for giant planet…

Earth and Planetary Astrophysics · Physics 2026-03-18 Angie Daniela Guzmán Franco , Sofia Savvidou , Bertram Bitsch

Terrestrial planets form in a series of dynamical steps from the solid component of circumstellar disks. First, km-sized planetesimals form likely via a combination of sticky collisions, turbulent concentration of solids, and gravitational…

Astrophysics · Physics 2009-11-13 Sean N. Raymond

The subject of satellite formation is strictly linked to the one of planetary formation. Giant planets strongly shape the evolution of the circum-planetary disks during their formation and thus, indirectly, influence the initial conditions…

Earth and Planetary Astrophysics · Physics 2014-11-20 Angioletta Coradini , Gianfranco Magni , Diego Turrini

Our galaxy is full with planets. We now know that planets and planetary systems are diverse and come with different sizes, masses and compositions, as well as various orbital architectures. Although there has been great progress in…

Earth and Planetary Astrophysics · Physics 2021-12-15 Ravit Helled , Alessandro Morbidelli

Small bodies are the remnant building blocks from the time when the planets formed and migrated to their current positions. Their volatile composition and relative abundances serve as time capsules for the formation conditions in the…

Earth and Planetary Astrophysics · Physics 2025-07-18 Kathleen Mandt , Oleksandra Ivanova , Olga Harrington Pinto , Nathan X. Roth , Darryl Z. Seligman

The processes of planet formation and migration depend intimately on the interaction between planetesimals and the gaseous disks in which they form. The formation of gaps in the disk can severely limit the mass of the planet and its…

Astrophysics · Physics 2009-11-07 Wayne F. Winters , Steven A. Balbus , John F. Hawley

We consider several processes operating during the late stages of planet formation that can affect observed orbital elements. Disk-planet interactions, tidal interactions with the central star, long term orbital instability and the Kozai…

Astrophysics · Physics 2007-05-23 D. N. C. Lin , J. C. B. Papaloizou , G. Bryden , S. Ida , C. Terquem