[Formation planétaire et phases précoces]
Les planètes se forment dans des disques proto-planétaires. Dans cette revue, nous allons d’abord aborder la structure et les propriétés de ces disques, puis les phénomènes multiples qui permettent d’aboutir au produit final : un système planétaire. Premièrement viennent les processus de sédimentation et coagulation de la poussière micrométrique. Ensuite, les interactions complexes entre le gaz et des agrégats de poussière centimétrique entrainent des phénomènes très efficaces tels l’instabilité de flux et la « pebble accretion » . Enfin, l’accrétion du gaz se fait sur des cœurs solides d’une dizaine de masses terrestres.
Une fois le disque de gaz dissipé, les planètes géantes dotées d’anneaux massifs peuvent former des satellites, les planètes telluriques s’assemblent à partir d’embryons, et des instabilités dynamiques globales donnent aux systèmes planétaires leur architecture finale.
Planets form in proto-planetary disks. In this review, we describe the structure and properties of such disks, and the various phenomenons that lead to the final product: a planetary system. First, micrometre dust settles and coagulates. Then, a complex interplay between the gas and centimetre aggregates leads to efficient phenomenons such as the streaming instability and the pebble accretion. Finally, gas accretion proceeds on ten Earth mass solid cores.
Once the gas disk is dissipated, giant planets may form satellites from massive rings, the terrestrial planets assemble from smaller embryos, and global dynamical instabilities give the planetary systems their final architecture.
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Mot clés : Disques proto-planétaires, formation des planètes, formation des satellites, migration planétaire, dynamique
Aurélien Crida 1
CC-BY 4.0
@article{CRPHYS_2023__24_S2_233_0,
author = {Aur\'elien Crida},
title = {Planetary formation and early phases},
journal = {Comptes Rendus. Physique},
pages = {233--248},
publisher = {Acad\'emie des sciences, Paris},
volume = {24},
number = {S2},
year = {2023},
doi = {10.5802/crphys.161},
language = {en},
}
Aurélien Crida. Planetary formation and early phases. Comptes Rendus. Physique, Volume 24 (2023) no. S2, pp. 233-248. doi : 10.5802/crphys.161. https://comptes-rendus.academie-sciences.fr/physique/articles/10.5802/crphys.161/
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