Journal ArticleDOI
Forming Planets via Pebble Accretion
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TLDR
In this article, a review of all aspects of planet formation by pebble accretion, from dust growth over planetesimal formation to the accretion of protoplanets and fully grown planets with gaseous envelopes, is presented.Abstract:
The detection and characterization of large populations of pebbles in protoplanetary disks have motivated the study of pebble accretion as a driver of planetary growth. This review covers all aspects of planet formation by pebble accretion, from dust growth over planetesimal formation to the accretion of protoplanets and fully grown planets with gaseous envelopes. Pebbles are accreted at a very high rate—orders of magnitude higher than planetesimal accretion—and the rate decreases only slowly with distance from the central star. This allows planetary cores to start their growth in much more distant positions than their final orbits. The giant planets orbiting our Sun and other stars, including systems of wide-orbit exoplanets, can therefore be formed in complete consistency with planetary migration. We demonstrate how growth tracks of planetary mass versus semimajor axis can be obtained for all the major classes of planets by integrating a relatively simple set of governing equations.read more
Citations
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Journal ArticleDOI
Growth model interpretation of planet size distribution
Li Zeng,Stein B. Jacobsen,Dimitar Sasselov,Michail I. Petaev,Andrew Vanderburg,Mercedes Lopez-Morales,Juan Pérez-Mercader,Thomas R. Mattsson,Gongjie Li,Matthew Z. Heising,Aldo S. Bonomo,Mario Damasso,Travis A. Berger,Hao Cao,Amit Levi,Robin Wordsworth +15 more
TL;DR: In this paper, a growth model and Monte Carlo simulations are used to demonstrate that many intermediate-size exoplanets are water worlds, which matches the second peak of the exoplanet radius bimodal distribution.
Journal ArticleDOI
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au
Eric L. Nielsen,Robert J. De Rosa,Bruce Macintosh,Jason J. Wang,Jason J. Wang,Jean-Baptiste Ruffio,Eugene Chiang,Mark S. Marley,Didier Saumon,Dmitry Savransky,S. Mark Ammons,Vanessa P. Bailey,Travis Barman,Celia Blain,Joanna Bulger,Adam Burrows,Jeffrey Chilcote,Jeffrey Chilcote,Tara Cotten,Ian Czekala,Ian Czekala,René Doyon,Gaspard Duchêne,Gaspard Duchêne,Thomas M. Esposito,Daniel C. Fabrycky,Michael P. Fitzgerald,Katherine B. Follette,Jonathan J. Fortney,Benjamin L. Gerard,Benjamin L. Gerard,Stephen J. Goodsell,James R. Graham,Alexandra Z. Greenbaum,Pascale Hibon,Sasha Hinkley,Lea A. Hirsch,Justin Hom,Li Wei Hung,Rebekah I. Dawson,Patrick Ingraham,Paul Kalas,Paul Kalas,Quinn Konopacky,James E. Larkin,Eve J. Lee,Jonathan W. Lin,Jérôme Maire,Franck Marchis,Christian Marois,Christian Marois,Stanimir Metchev,Stanimir Metchev,Maxwell A. Millar-Blanchaer,Katie M. Morzinski,Rebecca Oppenheimer,David Palmer,Jennifer Patience,Marshall D. Perrin,Lisa Poyneer,Laurent Pueyo,Roman R. Rafikov,Abhijith Rajan,Julien Rameau,Fredrik T. Rantakyrö,Bin Ren,Adam C. Schneider,Anand Sivaramakrishnan,Inseok Song,Rémi Soummer,Melisa Tallis,Sandrine Thomas,Kimberly Ward-Duong,Schuyler Wolff +73 more
TL;DR: Nielsen et al. as discussed by the authors presented a statistical analysis of the first 300 stars observed by the Gemini Planet Imager Exoplanet Survey (GPEES) to infer the underlying distributions of substellar companions with respect to their mass, semimajor axis, and host stellar mass.
Journal ArticleDOI
Pebble-isolation mass: Scaling law and implications for the formation of super-Earths and gas giants
Bertram Bitsch,Alessandro Morbidelli,Anders Johansen,Elena Lega,Michiel Lambrechts,Aurélien Crida +5 more
TL;DR: In this paper, the dependence of the pebble isolation mass on all relevant parameters of the protoplanetary disc was explored and a simple scaling law that captured the dependence on the local disc structure and the turbulent viscosity parameter α was derived.
Journal ArticleDOI
Why do protoplanetary disks appear not massive enough to form the known exoplanet population
TL;DR: In this paper, the masses of confirmed exoplanets and compared their dependence on stellar mass with the same dependence for protoplanetary disk masses measured in ∼1-3 Myr old star-forming regions.
Journal ArticleDOI
The planet nine hypothesis
TL;DR: In this article, the existence of a new planet with mass of m_g ∼5−10M, residing on a moderately inclined orbit with semi-major axis a_g∼400−800 AU and eccentricity between e_g ∼0.2−0.5.
References
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Journal ArticleDOI
Formation of the Giant Planets by Concurrent Accretion of Solids and Gas
James B. Pollack,Olenka Hubickyj,Peter Bodenheimer,Jack J. Lissauer,Morris Podolak,Yuval Greenzweig +5 more
TL;DR: In this article, the authors presented a self-consistent, interactive simulation of the formation of the giant planets, in which for the first time both the gas and planetesimal accretion rates were calculated in a selfconsistent and interactive fashion.
Journal ArticleDOI
Direct imaging of multiple planets orbiting the star HR 8799.
Christian Marois,Christian Marois,Christian Marois,Bruce Macintosh,Travis S. Barman,Barry Zuckerman,Inseok Song,Jennifer Patience,David Lafrenière,René Doyon +9 more
TL;DR: High-contrast observations with the Keck and Gemini telescopes have revealed three planets orbiting the star HR 8799, with projected separations of 24, 38, and 68 astronomical units.
Journal ArticleDOI
Structure of the Solar Nebula, Growth and Decay of Magnetic Fields and Effects of Magnetic and Turbulent Viscosities on the Nebula
Journal ArticleDOI
The Planet-Metallicity Correlation
Debra A. Fischer,Jeff A. Valenti +1 more
TL;DR: In this paper, the authors identify a subset of 850 stars that have Doppler observations sufficient to detect uniformly all planets with radial velocity semiamplitudes K > 30 m s-1 and orbital periods shorter than 4 yr, and determine that fewer than 3% of stars with -0.5 + 0.3 dex, 25% of observed stars have detected gas giant planets.
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