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Constraints from deuterium on the formation of icy bodies in the Jovian system and beyond |
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| Authors: | Jonathan Horner Olivier Mousis Jonathan I Lunine |
| Institution: | a Astronomy Group, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK b Observatoire de Besançon, Institut UTINAM, CNRS-UMR 6213, BP 1615, 25010 Besançon Cedex, France c Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ, USA d Centre d’Etude Spatiale des Rayonnements, Université Paul Sabatier, France e Ecole Polytechnique Palaiseau Cedex, France |
| Abstract: | We consider the role of deuterium as a potential marker of location and ambient conditions during the formation of small bodies in our Solar system. We concentrate in particular on the formation of the regular icy satellites of Jupiter and the other giant planets, but include a discussion of the implications for the Trojan asteroids and the irregular satellites. We examine in detail the formation of regular planetary satellites within the paradigm of a circum-Jovian subnebula. Particular attention is paid to the two extreme potential subnebulae—“hot” and “cold”. In particular, we show that, for the case of the “hot” subnebula model, the D:H ratio in water ice measured from the regular satellites would be expected to be near-Solar. In contrast, satellites which formed in a “cold” subnebula would be expected to display a D:H ratio that is distinctly over-Solar. We then compare the results obtained with the enrichment regimes which could be expected for other families of icy small bodies in the outer Solar system—the Trojan asteroids and the irregular satellites. In doing so, we demonstrate how measurements by Laplace, the James Webb Space Telescope, HERSCHEL and ALMA will play an important role in determining the true formation locations and mechanisms of these objects. |
| Keywords: | Solar system formation Deuterium Jupiter Satellites: regular Satellites: irregular Asteroids: Trojan Spacecraft |
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