Predicting Planets in Known Extra-Solar Planetary Systems II: Testing for Saturn-mass Planets

Details Predicting Planets in Known Extra-Solar Planetary Systems II: Testing for Saturn-mass Planets Predicting Planets in Known Extra-Solar Planetary Systems II: Testing for Saturn-mass Planets

2004-04-09

arxiv.org/abs/astro-ph/0404211v1

Astrophys.J. 619 (2005) 549-557

Astronomy and Astrophysics

Astrophysics

submitted to ApJ 9 pages, 8 figures, 3 tables

Scientific paper

10.1086/426311

Recent results have shown that many of the known extrasolar planetary systems contain regions which are stable for massless test particles. We examine the possibility that Saturn-mass planets exist in these systems, just below the detection threshold, and attempt to predict likely orbital parameters for such unseen planets. To do this, we insert a Saturn-mass planet into the stable regions of these systems and integrate its orbit for 100 million years. We conduct 200-600 of these experiments to test parameter space in HD37124, HD38529, 55Cnc, and HD74156. In HD37124 the global maximum of the survival rate of Saturns in parameter space is at semimajor axis a = 1.03 AU, eccentricity e=0.1. In HD38529, only 5% of Saturns are unstable, and the region in which a Saturn could survive is very broad, centered on 0.5

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