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Origin of debris disks and the supply of metals in DZ white dwarfs

Published online by Cambridge University Press:  01 October 2007

Y. Wang ,
R. B. Dong ,
D. N. C. Lin  and
X. W. Liu
Y. Wang
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: [email protected]
R. B. Dong
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: [email protected]
D. N. C. Lin
Affiliation:
Kavli Institute of Astronomy and Astrophysics, Peking University, 100871, Beijing, China email: [email protected] Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA email: [email protected]
X. W. Liu
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: [email protected] Kavli Institute of Astronomy and Astrophysics, Peking University, 100871, Beijing, China email: [email protected]
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Abstract

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We discuss the dynamical evolution of minor planetary bodies in the outer regions of planetary systems around the progenitors of DZ white dwarfs. We show that during the planetary-nebula phase of these stars, mass loss can lead to the expansion of all planetary bodies. The orbital eccentricity of the minor bodies, as relics of planetesimals, may be largely excited by the perturbation due to both gas drag effects and nearby gas giant planets. Some of these bodies migrate toward the host star, while others are scattered out of the planetary system. The former have modest probability of being captured by the sweeping secular resonances of giant planets, and induced to migrate toward the host star. When they venture close to their host stars, their orbits are tidally circularized so that they form compact disks where they may undergo further collisionally driven evolution. During the subsequent post main sequence evolution of their host stars, this process may provide an avenue which continually channels heavy elements onto the surface of the white dwarfs. We suggest that this scenario provides an explanation for the recently discovered Calcium line variation in G29-38.

Keywords

Giant planetdebris disksplanet dynamicn-body simulationswhite dwarfs
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 389 - 392
Copyright
Copyright © International Astronomical Union 2008

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