Astronomy and Astrophysics – Astronomy
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.9003c&link_type=abstract
American Astronomical Society Meeting 210, #90.03; Bulletin of the American Astronomical Society, Vol. 39, p.203
Astronomy and Astrophysics
Astronomy
Scientific paper
GJ 876 is a 0.32 solar-mass M4 dwarf currently hosting three known planets. The inner planet of this star is a 7.5 Earth-masses body at 0.02 AU with an unknown orbital eccentricity. The two outer planets of this system are Jovian-type and located at 0.130 AU and 0.208 AU from the central star. We have studied the possibility of the existence of other Earth-like objects between the two inner planets of this system. We carried out numerical simulations of the dynamical stability of test particles in the region between 0.03 AU and 0.12 AU, for different values of the orbital eccentricity of the currently known Earth-sized object. We also studied the orbital dynamics of additional Earth-like planets in this region. Results indicate that additional terrestrial bodies may only exist in a small region between 0.04 AU and 0.05 AU from the central star. The inner region of the planetary system of GJ 876 seems to be dynamically full.
This work has been supported by NASA Astrobiology Institute under Cooperative Agreement NNA04CC08A at the Institute for Astronomy at the University of Hawaii-Manoa.
Castro Joseph
Haghighipour Nader
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