We investigate the secular resonances for massless small bodies and Earth-like planets in several planetary systems. We further compare the results with those of Solar System. For example, in the GJ 876 planetary system. We show that the secular resonances v and v[ ](respectively, resulting from the inner and outer giant planets) can excite the eccentricities of the Earth-like planets with orbits 0.21 AU <= a < 0.50 AU and render them eject out from the system in short timescale. However, in a dynamical sense, the potential zones for the existence of Earth-like planets are in the areas 0.50 AU <= a <= 1.00 AU, and there exist all stable orbits last up to 105 yr with low eccentricities. For other systems, e.g., 47UMa, HD12661 and HD108874, we also show that the Habitable zones for Earth-like planets are related to both secular resonances and mean motion resonances in the systems.
Near Earth Objects, our Celestial Neighbors: Opportunity and Risk
- Pub Date:
- May 2007
- 8 pages, 3 figures, accepted to IAU236. Proceeding of IAU 236: Near Earth Objects, Our Celestial Neighbors: Opportunity and Risk, in press