The Galilean Satellites Formed Slowly from Pebbles

Shibaike, Yuhito; Ormel, Chris W.; Ida, Shigeru; Okuzumi, Satoshi; Sasaki, Takanori (2019). The Galilean Satellites Formed Slowly from Pebbles. Astrophysical journal, 885(1), p. 79. Institute of Physics Publishing IOP 10.3847/1538-4357/ab46a7

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It is generally accepted that the four major (Galilean) satellites formed out of the gas disk that accompanied Jupiter's formation. However, understanding the specifics of the formation process is challenging, as both small particles (pebbles) and the satellites are subject to fast migration processes. Here we hypothesize a new scenario for the origin of the Galilean system, based on the capture of several planetesimal seeds and subsequent slow accretion of pebbles. To halt migration, we invoke an inner disk truncation radius, and other parameters are tuned for the model to match physical, dynamical, compositional, and structural constraints. In our scenario it is natural that Ganymede's mass is determined by pebble isolation. Our slow pebble accretion scenario then reproduces the following characteristics: (1) the mass of all the Galilean satellites; (2) the orbits of Io, Europa, and Ganymede captured in mutual 2:1 mean motion resonances; (3) the ice mass fractions of all the Galilean satellites; and (4) the unique ice-rock partially differentiated Callisto and the complete differentiation of the other satellites. Our scenario is unique to simultaneously reproduce these disparate properties.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute
08 Faculty of Science > Physics Institute > NCCR PlanetS

UniBE Contributor:

Shibaike, Yuhito

Subjects:

500 Science
500 Science > 520 Astronomy
500 Science > 530 Physics

ISSN:

0004-637X

Publisher:

Institute of Physics Publishing IOP

Language:

English

Submitter:

Janine Jungo

Date Deposited:

21 Apr 2020 13:50

Last Modified:

26 Apr 2020 02:47

Publisher DOI:

10.3847/1538-4357/ab46a7

BORIS DOI:

10.7892/boris.142987

URI:

https://boris.unibe.ch/id/eprint/142987

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