Trojan planets in HD108874?

Autor(en)

Richard Schwarz, Rudolf Dvorak, Elke Pilat-Lohinger

Abstrakt

Today there are about 190 extrasolar planets in 156 extrasolar systems confirmed. We have only observational evidence for planets from 7 (Gliese 876 d) earth masses up to several Jupiter masses; and up to now no planet with a mass comparable to the Earth was found. To ensure that an orbit of such a planet is stable in the so-called habitable zone around a host star in planetary systems with Jupiter-like planets we can have different confugurations: either a hot Jupiter (very close to the central star) or (and) a planet far enough not to perturb the motions of a planetary body in the habitable zone (which depends on the astrophysical parameters of the star). Besides the two former mentioned possibilites there may exist also stable orbits around a 'Jupiter' in this habitable zone: a planet as satelliteor - we cannot exclude it - a Trojan planet. For the first time in a multiplanetary system, namely in HD108872 (a sunlike star), we found that Trojan planets may exist in the 1:1 resonance with the inner Jupiter-like planet (with a semimajor axis of approximately 1AU). We investigate the region around the Lagrange points for a wide range of the orbital parameters of the two planets. It turned out that with the actually determined orbital elements of both planets (for HD108874c a=2.7AU) a small region around the Lagrange points may host earth-like planets in the habitable zone of this star.

Organisation(en)

Institut für Astrophysik

Publikationsdatum

2006

ÖFOS 2012

1030 Physik, Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/5353f5c1-ac37-475e-ba0e-8eff2d0d4e9c