Pebble Accretion at the Origin of Water in Europa
(2017) In Astrophysical Journal 845(2).- Abstract
Despite the fact that the observed gradient in water content among the Galilean satellites is globally consistent with a formation in a circum-Jovian disk on both sides of the snowline, the mechanisms that led to a low water mass fraction in Europa (∼8%) are not yet understood. Here, we present new modeling results of solids transport in the circum-Jovian disk accounting for aerodynamic drag, turbulent diffusion, surface temperature evolution, and sublimation of water ice. We find that the water mass fraction of pebbles (e.g., solids with sizes of 10-2-1 m) as they drift inward is globally consistent with the current water content of the Galilean system. This opens the possibility that each satellite could have formed through... (More)
Despite the fact that the observed gradient in water content among the Galilean satellites is globally consistent with a formation in a circum-Jovian disk on both sides of the snowline, the mechanisms that led to a low water mass fraction in Europa (∼8%) are not yet understood. Here, we present new modeling results of solids transport in the circum-Jovian disk accounting for aerodynamic drag, turbulent diffusion, surface temperature evolution, and sublimation of water ice. We find that the water mass fraction of pebbles (e.g., solids with sizes of 10-2-1 m) as they drift inward is globally consistent with the current water content of the Galilean system. This opens the possibility that each satellite could have formed through pebble accretion within a delimited region whose boundaries were defined by the position of the snowline. This further implies that the migration of the forming satellites was tied to the evolution of the snowline so that Europa fully accreted from partially dehydrated material in the region just inside of the snowline.
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- author
- Ronnet, Thomas LU ; Mousis, Olivier and Vernazza, Pierre
- publishing date
- 2017-08-20
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- methods: numerical, planets and satellites: formation, planets and satellites: individual (Jupiter, Galilean satellites), protoplanetary disks
- in
- Astrophysical Journal
- volume
- 845
- issue
- 2
- article number
- 92
- publisher
- American Astronomical Society
- external identifiers
-
- scopus:85028752116
- ISSN
- 0004-637X
- DOI
- 10.3847/1538-4357/aa80e6
- language
- English
- LU publication?
- no
- id
- d3b34192-3929-460a-8d08-bbe941b89ebd
- date added to LUP
- 2019-05-29 09:27:19
- date last changed
- 2022-04-26 00:58:10
@article{d3b34192-3929-460a-8d08-bbe941b89ebd,
abstract = {{<p>Despite the fact that the observed gradient in water content among the Galilean satellites is globally consistent with a formation in a circum-Jovian disk on both sides of the snowline, the mechanisms that led to a low water mass fraction in Europa (∼8%) are not yet understood. Here, we present new modeling results of solids transport in the circum-Jovian disk accounting for aerodynamic drag, turbulent diffusion, surface temperature evolution, and sublimation of water ice. We find that the water mass fraction of pebbles (e.g., solids with sizes of 10<sup>-2</sup>-1 m) as they drift inward is globally consistent with the current water content of the Galilean system. This opens the possibility that each satellite could have formed through pebble accretion within a delimited region whose boundaries were defined by the position of the snowline. This further implies that the migration of the forming satellites was tied to the evolution of the snowline so that Europa fully accreted from partially dehydrated material in the region just inside of the snowline.</p>}},
author = {{Ronnet, Thomas and Mousis, Olivier and Vernazza, Pierre}},
issn = {{0004-637X}},
keywords = {{methods: numerical; planets and satellites: formation; planets and satellites: individual (Jupiter, Galilean satellites); protoplanetary disks}},
language = {{eng}},
month = {{08}},
number = {{2}},
publisher = {{American Astronomical Society}},
series = {{Astrophysical Journal}},
title = {{Pebble Accretion at the Origin of Water in Europa}},
url = {{http://dx.doi.org/10.3847/1538-4357/aa80e6}},
doi = {{10.3847/1538-4357/aa80e6}},
volume = {{845}},
year = {{2017}},
}