EDP Sciences
Free access
Issue A&A
Volume 466, Number 2, May I 2007
Page(s) L9 - L12
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20077170

A&A 466, L9-L12 (2007)
DOI: 10.1051/0004-6361:20077170


Photophoresis as a source of hot minerals in comets

O. Mousis1, J.-M. Petit1, G. Wurm2, O. Krauss2, Y. Alibert3, and J. Horner4

1  Institut UTINAM, CNRS-UMR 6213, Observatoire de Besançon, BP 1615, 25010 Besançon Cedex, France
    e-mail: Olivier.Mousis@obs-besancon.fr
2  Institute for Planetology, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany
3  Physikalisches Institut, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
4  Astronomy Group, Open University, Walton Hall, Milton Keynes MK76AA, UK

(Received 25 January 2007 / Accepted 24 February 2007)

A time-dependent model of the solar nebula is used to describe the outward transport of hot mineral aggregates from locations in the warm inner regions of the nebula under the influence of photophoresis. We show that there is a direct dependence between the size of the gap initially assumed to exist in the inner solar nebula and the heliocentric distance to which the aggregates are likely to drift. We demonstrate that, despite a significant contribution to the opacity of the disk resulting from Rayleigh scattering by hydrogen, photophoresis can be considered as a transport mechanism leading to the presence of hot minerals in comets. This mechanism can lead to an influx of hot minerals in the formation regions of the main cometary reservoirs, implying a potential "dust-loading" of bodies from these populations. This scenario is compatible with the detection of crystalline silicates in a growing number of comets and also with the recent identification of CAIs in the samples returned from Comet 81P/Wild 2 by the Stardust mission. Finally, we find that this mechanism is consistent with the compositional diversity observed in small bodies of the outer solar system, in contrast to other proposed processes which invoke an efficient turbulent mixing within the primordial nebula.

Key words: solar system: formation -- comets: general -- comets: individual: 81P/Wild 2, Kuiper Belt, Oort Cloud

© ESO 2007

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.

Editor-in-Chief: T. Forveille
Letters Editor-in-Chief: J. Alves
Managing Editor: C. Bertout

ISSN: 0004-6361 ; e-ISSN: 1432-0746
Frequency: 12 volumes per year
Published by: EDP Sciences

Mirror sites: CDS | EDP Sciences
  RSS feeds
© The European Southern Observatory (ESO)