Other
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011dda....42.0604v&link_type=abstract
American Astronomical Society, DDA meeting #42, #6.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Other
Scientific paper
Classical secular theory can be a powerful tool to describe the qualitative character of multi-planet systems and offer insight into their histories. For example, major axes currently locked in alignment may indicate substantial tidal damping. Also, current near-separatrix behavior may suggest an early mutual scattering event. And eigenmodes help assess dynamical coupling. For 55 Cancri, using the orbital solution by Fischer et al. 2008, the current alignment of major axes is fortuitous as these planets are all controlled by different eigenmodes. Also, there are two dynamical groups: the inner three planets and the outer two. With the orbit solution from Dawson and Fabrycky 2010, again the alignment of major axes is fortuitous. Also, the group structure changes: the innermost planet is now fairly decoupled from the other inner planets. This decoupling allows the eccentricity of the inner planet to stay fairly low independent of planetary interactions. For 61 Virginis, the libration of the outer planets' major axes is not due to eccentricity damping. Instead the outer planets are in a dynamical group and libration results from initial conditions and a propensity due to the system's basic architecture (i.e. masses and semi-major axes). HIP 14810 is similar to 61 Virginis, though in this case it is the inner two planets that are in the dynamical group. For Gliese 581 with Vogt et al.'s (2010) solution, the 4th and 5th planets (g and d) are in a dynamical subgroup. Anglada-Escude (2011) showed that if planet g does exist it implies that planet d likely has an eccentricity of about 0.1. Given the strong secular coupling through shared eigenmodes, Gliese 581 g would also be expected to have a substantial eccentricity, perhaps decreasing the likelihood of habitability.
Greenberg Richard
Van Laerhoven Christa L.
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