Stability of fictitious Trojan planets in extrasolar systems

R. Schwarz, R. Dvorak, Á Süli, B. Érdi

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13 Citations (Scopus)


Our work deals with the dynamical possibility that in extrasolar planetary systems a terrestrial planet may have stable orbits in a 1:1 mean motion resonance with a Jovian like planet. We studied the motion of fictitious Trojans around the Lagrangian points L4/L5 and checked the stability and/or chaoticity of their motion with the aid of the Lyapunov Indicators and the maximum eccentricity, The computations were carried out using the dynamical model of the elliptic restricted three-body problem that consists of a central star, a gas giant moving in the habitable zone, and a massless terrestrial planet. We found 3 new systems where the gas giant lies in the habitable zone, namely HD 99109, HD101930, and HD 33564. Additionally we investigated all known extrasolar planetary systems where the giant planet lies partly or fully in the habitable zone. The results show that the orbits around the Lagrangian points L4/L5 of all investigated systems are stable for long times (107 revolutions).

Original languageEnglish
Pages (from-to)785-788
Number of pages4
JournalAstronomische Nachrichten
Issue number8
Publication statusPublished - Aug 1 2007



  • Celestial mechanics, stellar dynamics
  • Planetary systems

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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