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Accretion of planetary matter from debris disks around white dwarfs: the fate of planetary systems

Published online by Cambridge University Press:  19 December 2013

M. Deal ,
S. Deheuvels ,
G. Vauclair ,
S. Vauclair  and
F.C. Wachlin
M. Deal*
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, France CNRS, IRAP, 14 avenue Edouard Belin, 31400 Toulouse, France
S. Deheuvels*
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, France CNRS, IRAP, 14 avenue Edouard Belin, 31400 Toulouse, France
G. Vauclair*
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, France CNRS, IRAP, 14 avenue Edouard Belin, 31400 Toulouse, France
S. Vauclair*
Affiliation:
Université de Toulouse, UPS-OMP, IRAP, France CNRS, IRAP, 14 avenue Edouard Belin, 31400 Toulouse, France
F.C. Wachlin*
Affiliation:
Facultad de Ciencias Astronomicas y Geosicas, 20646 La plata, Argentina Instituto de Astrosica de La Plata, 20646 La plata, Argentina
*
e-mail: morgan.deal@irap.omp.eu
e-mail: sebastien.deheuveuls@irap.omp.eu
e-mail: gerard.vauclair@irap.omp.eu
e-mail: sylvie.vauclair@irap.omp.eu
e-mail: fwachlin@gmail.com
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Abstract

Heavy elements are observed in the atmospheres of many DA and DB white dwarfs, and their presence is attributed to the accretion of matter coming from debris disks. Several authors have deduced accretion rates from the observed abundances, taking into account the mixing induced by the convective zones and the gravitational settling. The obtained values are different for DA and DB white dwarfs. Here we show that an important process was forgotten in all these computations: thermohaline mixing, induced by the inverse μ-gradient built during the accretion process. Taking this mixing into account leads to an increase of the derived accretion rates, specially for DA white dwarfs, and modifies the conclusions.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 63: New Advances in Stellar Physics: From Microscopic to Macroscopic Processes , 2013 , pp. 297 - 302
Copyright
© EAS, EDP Sciences, 2013

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