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Title:
Growth of Jupiter: Enhancement of core accretion by a voluminous low-mass envelope
Authors:
D'Angelo, Gennaro; Weidenschilling, Stuart J.; Lissauer, Jack J.; Bodenheimer, Peter
Affiliation:
AA(NASA Ames Research Center, Space Science and Astrobiology Division, MS 245-3, Moffett Field, CA 94035, USA), AB(Planetary Science Institute, 1700 East Fort Lowell Road, Suite 106, Tucson, AZ 85719-2395, USA), AC(NASA Ames Research Center, Space Science and Astrobiology Division, MS 245-3, Moffett Field, CA 94035, USA), AD(UCO/Lick Observatory, Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA)
Publication:
Icarus, Volume 241, p. 298-312. (Icarus Homepage)
Publication Date:
10/2014
Origin:
ELSEVIER
Abstract Copyright:
(c) 2014 Elsevier Inc.
DOI:
10.1016/j.icarus.2014.06.029
Bibliographic Code:
2014Icar..241..298D

Abstract

We present calculations of the early stages of the formation of Jupiter via core nucleated accretion and gas capture. The core begins as a seed body of about 350 km in radius and orbits in a swarm of planetesimals whose initial radii range from 15 m to 50 km. The evolution of the swarm accounts for growth and fragmentation, viscous and gravitational stirring, and for drag-assisted migration and velocity damping. During this evolution, less than 9% of the mass is in planetesimals smaller than 1 km in radius; ≲25% is in planetesimals with radii between 1 and 10 km; and ≲7% is in bodies with radii larger than 100 km. Gas capture by the core substantially enhances the size-dependent cross-section of the planet for accretion of planetesimals. The calculation of dust opacity in the planet's envelope accounts for coagulation and sedimentation of dust particles released as planetesimals are ablated. The calculation is carried out at an orbital semi-major axis of 5.2 AU and the initial solids' surface density is 10 g cm-2 at that distance. The results give a core mass of nearly 7.3 Earth masses (M⊕) and an envelope mass of ≈0.15 M⊕ after about 4×105 years, at which point the envelope growth rate surpasses that of the core. The same calculation without the envelope yields a core of only about 4.4 M⊕.
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