Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21443410s&link_type=abstract
American Astronomical Society, AAS Meeting #214, #434.10; Bulletin of the American Astronomical Society, Vol. 41, p.706
Astronomy and Astrophysics
Astronomy
1
Scientific paper
High resolution, infrared images of HR8799, taken between 2004 and 2008, show three objects in orbit around the parent star (Marois et al. 2008). Fabrycky and Murray-Clay (2009) have found a three-planet model of the HR8799 system that is stable for at least 160 Myr, the upper limit to the age of the parent star. The planets in this model have masses of 10, 10, and 7 MJup and semi-major axes of 23.42, 37.97, and 67.91 AU, respectively. Using this model as a starting point, and using the HYBRID algorithm in the Mercury software to integrate the Newtonian equations of motion, we have searched for stable orbits for a hypothetical, fourth planet, interior to the innermost planet in the three-planet model. We have found that a planet of at least 1 MJup can reside in the neighborhood of 10.2 AU and the system is stable for at least 160 Myr. This four-planet model bears some resemblance to the Jovian planets of our Solar System, scaled up by a factor of two. We will also report on simulations to determine stable orbits for terrestrial planets.
Assalita S.
Haghighipour Nader
Johnston Bernard
Sudol Jeffrey J.
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