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Planets in habitable zones: A study of the binary Gamma Cephei | | R. Dvorak
; E. Pilat-Lohinger
; B. Funk
; F. Freistetter
; | | Date: |
13 Nov 2002 | | Journal: | Astron.Astrophys. 398 (2003) L1-L4 | | Subject: | astro-ph | | Affiliation: | Institute of Astronomy, Vienna, Austria | | Abstract: | The recently discovered planetary system in the binary GamCep was studied concerning its dynamical evolution. We confirm that the orbital parameters found by the observers are in a stable configuration. The primary aim of this study was to find stable planetary orbits in a habitable region in this system, which consists of a double star (a=21.36 AU) and a relatively close (a=2.15 AU) massive (1.7 Mjup sin i) planet. We did straightforward numerical integrations of the equations of motion in different dynamical models and determined the stability regions for a fictitious massless planet in the interval of the semimajor axis 0.5 AU < a < 1.85 AU around the more massive primary. To confirm the results we used the Fast Lyapunov Indicators (FLI) in separate computations, which are a common tool for determining the chaoticity of an orbit. Both results are in good agreement and unveiled a small island of stable motions close to 1 AU up to an inclination of about 15 deg (which corresponds to the 3:1 mean motion resonance between the two planets). Additionally we computed the orbits of earthlike planets (up to 90 earthmasses) in the small stable island and found out, that there exists a small window of stable orbits on the inner edge of the habitable zone in GamCep even for massive planets. | | Source: | arXiv, astro-ph/0211289 | | Services: | Forum | Review | PDF | Favorites | |
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