Stability of Trojan planets in multi-planetary systems. Stability of Trojan planets in different dynamical systems

Autor(en)

Richard Schwarz, Áron Süli, Rudolf Dvorak, Elke Pilat-Lohinger

Abstrakt

Today there are more than 340 extra-solar planets in about 270 extra-solar systems confirmed. Besides the observed planets there exists also the possibility of a Trojan planet moving in the same orbit as the Jupiter-like planet. In our investigation we take also into account the habitability of a Trojan planet and whether such a terrestrial planet stays in the habitable zone. Its stability was investigated for multi-planetary systems, where one of the detected giant planets moves partly or completely in the habitable zone. By using numerical computations, we studied the orbital behaviour up to 107 years and determined the size of the stable regions around the Lagrangian equilibrium points for different dynamical models for fictitious Trojans. We also examined the interaction of the Trojan planets with a second or third giant planet, by varying its semimajor axis and eccentricity. We have found two systems (HD 155358 and HD 69830) that can host habitable Trojan planets. Another aim of this work was to determine the size of the stable region around the Lagrangian equilibrium points in the restricted three body problem for small mass ratios ? of the primaries ? ? 0.001 (e.g. Neptune mass of the secondary and smaller masses). We established a simple relation for the size depending on ? and the eccentricity.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Eötvös Loránd University Budapest

Journal

Celestial Mechanics and Dynamical Astronomy: an international journal of space dynamics

Band

104

Seiten

69-84

Anzahl der Seiten

16

ISSN

0923-2958

DOI

https://doi.org/10.1007/s10569-009-9210-9

Publikationsdatum

2009

Peer-reviewed

Ja

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/09dd6298-b2a3-495a-b748-4082145ef7e0