The stability of ultra-compact planetary systems
Aims. We investigate the dynamical stability of compact planetary systems in the CoRoT discovery space, i.e., with orbital periods of less than 50 days, including a detailed study of the stability of systems, which are spaced according to Hill's criteria. Methods. The innermost fictitious plane...
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Published in | Astronomy and astrophysics (Berlin) Vol. 516; p. A82 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
Les Ulis
EDP Sciences
01.06.2010
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Subjects | |
Online Access | Get full text |
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Summary: | Aims. We investigate the dynamical stability of compact planetary systems in the CoRoT discovery space, i.e., with orbital periods of less than 50 days, including a detailed study of the stability of systems, which are spaced according to Hill's criteria. Methods. The innermost fictitious planet was placed close to the Roche limit from the star (MStar = 1 MSun) and all other fictitious planets are lined up according to Hill's criteria up to a distance of 0.26 AU, which corresponds to a 50 day period for a Sun-massed star. For the masses of the fictitious planets, we chose a range of 0.33–17 mEarth, where in each simulation all fictitious planets have the same mass. Additionally, we tested the influence of both the semi-major axis of the innermost planet and of the number of planets. In a next step we also included a gas giant in our calculations, which perturbs the inner ones and investigated their stability. Results. With numerous integrations of many different configurations we could show that long-time stable motion is possible for up to 10 planets with 17 mEarth within a distance of 0.26 AU. Further investigations show that the fictitious planets remain stable under certain circumstances even if a close-in gas giant is present. |
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Bibliography: | istex:B8D0FFD01DB659FC15A2AC32E1B4974D1F70D158 other:2010A%26A...516A..82F publisher-ID:aa12698-09 ark:/67375/80W-4GCQKVG8-0 |
ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361/200912698 |