The librating companions in hd 37124, hd 12661, hd 82943, 47 uma and gj 876: alignment or antialignment?

May, 2003
13 pages
Published in:
  • Astrophys.J.Lett. 591 (2003) L57-L60
e-Print:

Citations per year

200320062009201220132341
Abstract: (arXiv)
We investigated the apsidal motion for the multi-planet systems. In the simulations, we found that the two planets of HD 37124, HD 12661, 47 Uma and HD 82943 separately undergo apsidal alignment or antialignment. But the companions of GJ 876 and υ\upsilon And are only in apsidal lock about 00^{\circ}. Moreover, we obtained the criteria with Laplace-Lagrange secular theory to discern whether a pair of planets for a certain system are in libration or circulation.