Origin of volatiles in the main belt

Mousis, O. and Alibert, Y. and Hestroffer, D. and Marboeuf, U. and Dumas, C. and Carry, B. and Horner, J. and Selsis, F. (2008) Origin of volatiles in the main belt. Monthly Notices of the Royal Astronomical Society , 383 (3). pp. 1269-1280. ISSN 0035-8711

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We propose a scenario for the formation of the main belt in which asteroids incorporated icy particles formed in the outer solar nebula. We calculate the composition of icy planetesimals formed beyond a heliocentric distance of 5 au in the nebula by assuming that the abundances of all elements, in particular that of oxygen, are solar. As a result, we show that ices formed in the outer solar nebula are composed of a mix of clathrate hydrates, hydrates formed above 50 K and pure condensates produced at lower temperatures. We then consider the inward migration of solids initially produced in the outer solar nebula and show that a significant fraction may have drifted to the current position of the main belt without encountering temperature and pressure conditions high enough to vaporize the ices they contain. We propose that, through the detection and identification of initially buried ices revealed by recent impacts on the surfaces of asteroids, it could be possible to infer the thermodynamic conditions that were present within the solar nebula during the accretion of these bodies, and during the inward migration of icy planetesimals. We also investigate the potential influence that the incorporation of ices in asteroids may have on their porosities and densities. In particular, we show how the presence of ices reduces the value of the bulk density of a given body, and consequently modifies its macroporosity from that which would be expected from a given taxonomic type.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2007 Authors.
Faculty / Department / School: Historic - Faculty of Engineering and Surveying - Department of Mechanical and Mechatronic Engineering
Date Deposited: 25 Jun 2014 01:45
Last Modified: 11 Aug 2014 03:21
Uncontrolled Keywords: minor planets; asteroids; solar system; formation
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
02 Physical Sciences > 0203 Classical Physics > 020304 Thermodynamics and Statistical Physics
02 Physical Sciences > 0201 Astronomical and Space Sciences > 020109 Space and Solar Physics
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1111/j.1365-2966.2007.12653.x
URI: http://eprints.usq.edu.au/id/eprint/25347

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