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Planetary Survival and Ejection in Transient Multiple Star Systems

Published online by Cambridge University Press:  29 April 2014

Zeyang Meng ,
Ji-Wei Xie  and
Ji-Lin Zhou
Zeyang Meng
Affiliation:
Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093, China email: mengzy1989@gmail.com
Ji-Wei Xie
Affiliation:
Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093, China email: mengzy1989@gmail.com Department of Astronomy and AstrophysicsUniversity of Toronto, Toronto, ON M5S 3H4, Canada email: jwxie@astro.utoronto.ca
Ji-Lin Zhou
Affiliation:
Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093, China email: mengzy1989@gmail.com
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Abstract

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Many planets have been detected in close binary stars with separation only ~20 AU. These discoveries challenge the current theory of planet formation because binary stars with such an close separation are thought to have strong perturbations and thus inhibit planet formation around them. To address this issue, another scenario had been suggested: the binary separation was wider enough for binary formation in early stages, but it shrank to the present one after a transient triple star phase (stellar scattering phase). Here, we investigate how could planet survive or be ejected under this scenario. We find that (1) the odds of planetary survival are significantly reduced if scatterings between planets and/or planetesimals are included (2) circumbinary planets/planetesimals could be readily formed during such a transient phase.

Keywords

Planet and satellites: formationMethods: N-body simulationsStars: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 174 - 176
Copyright
Copyright © International Astronomical Union 2014 

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