The formation of Jupiter by hybrid pebble–planetesimal accretion

Yann Alibert, Julia Venturini, Ravit Helled, Sareh Ataiee, Remo Burn, Luc Senecal, Willy Benz, Lucio Mayer, Christoph Mordasini, Sascha P. Quanz, Maria Schönbächler

Research output: Contribution to journalLetterpeer-review

Abstract

The standard model for giant planet formation is based on the accretion of solids by a growing planetary embryo, followed by rapid gas accretion once the planet exceeds a so-called critical mass1. However, the dominant size of the accreted solids (‘pebbles’ of the order of centimetres or ‘planetesimals’ of the order of kilometres to hundreds of kilometres) is unknown1,2. Recently, high-precision measurements of isotopes in meteorites have provided evidence for the existence of two reservoirs of small bodies in the early Solar System3. These reservoirs remained separated from ~1 Myr until ~3 Myr after the Solar System started to form. This separation is interpreted as resulting from Jupiter growing and becoming a barrier for material transport. In this framework, Jupiter reached ~20 Earth masses (M) within ~1 Myr and slowly grew to ~50 M in the subsequent 2 Myr before reaching its present-day mass3. The evidence that Jupiter’s growth slowed after reaching 20 M for at least 2 Myr is puzzling because a planet of this mass is expected to trigger fast runaway gas accretion4,5. Here, we use theoretical models to describe the conditions allowing for such a slow accretion and show that Jupiter grew in three distinct phases. First, rapid pebble accretion supplied the major part of Jupiter’s core mass. Second, slow planetesimal accretion provided the energy required to hinder runaway gas accretion during the 2 Myr. Third, runaway gas accretion proceeded. Both pebbles and planetesimals therefore play an important role in Jupiter’s formation.

Original languageEnglish
Pages (from-to)873-877
Number of pages5
JournalNature Astronomy
Volume2
Issue number11
DOIs
StatePublished - 1 Nov 2018
Externally publishedYes

Fingerprint

Dive into the research topics of 'The formation of Jupiter by hybrid pebble–planetesimal accretion'. Together they form a unique fingerprint.

Cite this