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Prevailing $N$-body planet formation models typically start with lunar-mass embryos and show a general trend of rapid migration of massive planetary cores to the inner Solar System in the absence of a migration trap. This setup cannot…

Earth and Planetary Astrophysics · Physics 2024-03-27 Tommy Chi Ho Lau , Man Hoi Lee , Ramon Brasser , Soko Matsumura

The formation of gas-giant planets within the lifetime of a protoplanetary disk is challenging especially far from a star. A promising model for the rapid formation of giant-planet cores is pebble accretion in which gas drag during…

Earth and Planetary Astrophysics · Physics 2021-06-30 John Chambers

Theories of planet formation predict the birth of giant planets in the inner, dense, and gas-rich regions of the circumstellar disks around young stars. These are the regions from which strong CO emission is expected. Observations have so…

Solar and Stellar Astrophysics · Physics 2015-05-20 Zs. Regaly , L. Kiss , Zs. Sandor , C. P. Dullemond

Direct imaging observations constrain the fraction of stars orbited by gas giant planets with separations greater than 10 au to about 0.01 only. This is widely believed to indicate that massive protoplanetary discs rarely fragment on…

Earth and Planetary Astrophysics · Physics 2016-10-07 Sergei Nayakshin

The discovery of giant planets in wide orbits represents a major challenge for planet formation theory. In the standard core accretion paradigm planets are expected to form at radial distances $\lesssim 20$ au in order to form massive cores…

Earth and Planetary Astrophysics · Physics 2018-05-30 O. M. Guilera , M. M. Miller Bertolami , M. P. Ronco

We propose a mechanism by which dust rings in protoplanetary disks can form and be long-lasting compared to gas rings. This involves the existence of a pressure maximum which traps dust either in between two gap-opening planets or at the…

Earth and Planetary Astrophysics · Physics 2014-11-21 Farzana Meru , Sascha P. Quanz , Maddalena Reggiani , Clement Baruteau , Jaime E. Pineda

In models of planetary accretion, pebbles form by dust coagulation and rapidly migrate toward the central star. Planetesimals may continuously form from pebbles over the age of the protoplanetary disk by yet uncertain mechanisms. Meanwhile,…

Earth and Planetary Astrophysics · Physics 2018-04-17 Ryuji Morishima

With n-body simulations, we model terrestrial circumbinary planet (CBP) formation with an initial surface density profile motivated by hydrodynamic circumbinary gas disc simulations. The binary plays an important role in shaping the initial…

Earth and Planetary Astrophysics · Physics 2021-09-01 Anna C. Childs , Rebecca G. Martin

We propose a comprehensive survey of giant planets ranging from close-in highly irradiated hot Jupiters to young, wide-orbit directly imaged planets. The combination of two established techniques for probing planetary atmospheric…

Instrumentation and Methods for Astrophysics · Physics 2024-09-04 Munazza K. Alam , Emily Rickman , Kielan Hoch , Paul Mollière , Josh Lothringer , Aarynn L. Carter , Isabel Rebollido , Ben J. Sutlieff , Jens Kammerer

Orbital evolution is a critical process that sculpts planetary systems, particularly during their early stages where planet-disk interactions are expected to lead to the formation of resonant chains. Despite the theoretically expected…

Earth and Planetary Astrophysics · Physics 2024-08-06 Vighnesh Nagpal , Max Goldberg , Konstantin Batygin

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

Debris disks are the dust disks found around ~20% of nearby main sequence stars in far-IR surveys. They can be considered as descendants of protoplanetary disks or components of planetary systems, providing valuable information on…

Earth and Planetary Astrophysics · Physics 2018-12-05 Mark C. Wyatt

Protoplanetary discs are dynamic environments where the interplay between chemical processes and mass transport shapes the composition of gas and dust available for planet formation. We investigate the combined effects of volatile chemistry…

We present a simple model for low-mass planet formation and subsequent evolution within "transition" discs. We demonstrate quantitatively that the predicted and observed structure of such discs are prime birthsites of planets. Planet…

Solar and Stellar Astrophysics · Physics 2017-03-28 James E. Owen , Juna A. Kollmeier

Transitional disks are protoplanetary disks with large and deep central holes in the gas, possibly carved by young planets. Dong, R., & Dawson, R. 2016, ApJ, 825, 7 simulated systems with multiple giant planets that were capable of carving…

Earth and Planetary Astrophysics · Physics 2023-03-08 Rory Bowens , Andrew Shannon , Rebekah Dawson , Jiayin Dong

The observed dust rings and gaps in protoplanetary disks could be imprints of forming planets. Even low-mass planets in the one-to-ten Earth-mass regime, that do not yet carve deep gas gaps, can generate such dust rings and gaps by driving…

Earth and Planetary Astrophysics · Physics 2024-12-04 Ayumu Kuwahara , Michiel Lambrechts , Hiroyuki Kurokawa , Satoshi Okuzumi , Takayuki Tanigawa

Main sequence stars, like the Sun, are often found to be orbited by circumstellar material that can be categorized into two groups, planets and debris. The latter is made up of asteroids and comets, as well as the dust and gas derived from…

Solar and Stellar Astrophysics · Physics 2015-06-18 Brenda C. Matthews , Alexander V. Krivov , Mark C. Wyatt , Geoff Bryden , Carlos Eiroa

Evidence of mutually inclined planetary orbits has been reported for giant planets these last years. Here we aim to study the impact of eccentric and inclined massive giant planets on the terrestrial planet formation process, and…

Earth and Planetary Astrophysics · Physics 2018-06-06 Sotiris Sotiriadis , Anne-Sophie Libert , Sean N. Raymond

We calculate the formation of dust clouds in atmospheres of giant gas-planets. The chemical structure and the evolution of the grain size distribution in the dust cloud layer is discussed based on a consistent treatment of seed formation,…

Astrophysics · Physics 2007-11-26 Christiane Helling

The two current models for giant planet formation are core accretion and disk instability. We discuss the core masses and overall planetary enrichment in heavy elements predicted by the two formation models, and show that both models could…

Earth and Planetary Astrophysics · Physics 2015-05-20 Ravit Helled , Peter Bodenheimer , Jack J. Lissauer