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Origin of the dusty disks around white dwarfs

Published online by Cambridge University Press:  01 October 2007

R. B. Dong ,
Y. Wang ,
D. N. C. Lin  and
X. W. Liu
R. B. Dong
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: rbdong@pku.edu.cn
Y. Wang
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: rbdong@pku.edu.cn
D. N. C. Lin
Affiliation:
Kavli Institute of Astronomy and Astrophysics, Peking University, 100871, Beijing, China email: liuxw@bac.pku.edu.cn Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064, USA email: lin@ucolick.org
X. W. Liu
Affiliation:
Department of Astronomy, Peking University, 100871, Beijing, China, email: rbdong@pku.edu.cn Kavli Institute of Astronomy and Astrophysics, Peking University, 100871, Beijing, China email: liuxw@bac.pku.edu.cn
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Abstract

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Some circumstantial evidence for residual planetesimals is constructed based on the recent discovery of a dusty ring around a young white dwarf at the center of the Helix nebula (Su et al. 2007). This ring extends between about 35 and 150 AU from the nebula center, and have a total mass of about 0.13 M⊕. In this paper we propose that this ring is the by-product of planets and planetesimals' orbital evolution during the epoch when the central star rapidly lost most of its mass. We examine the dynamical evolution of planetary systems similar to the solar system (i.e. with gas giant planets and residual planetesimals) as their host stars evolve off the main sequence. During the process, some planetesimals will be captured by the gas giants into mean motion resonances and their mutual collisions will form a dust ring similar to that observed at the center of the Helix nebula.

Keywords

Giant planetplanetary formationdebris disksplanet dynamicsn-body simulation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S249: Exoplanets: Detection, Formation and Dynamics , October 2007 , pp. 381 - 384
Copyright
Copyright © International Astronomical Union 2008

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