Habitable Planet Formation in Extreme Planetary Systems: Systems with Multiple Stars and/or Multiple Planets

Details Habitable Planet Formation in Extreme Planetary Systems: Systems with Multiple Stars and/or Multiple Planets Habitable Planet Formation in Extreme Planetary Systems: Systems with Multiple Stars and/or Multiple Planets

2007-12-15

arxiv.org/abs/0712.2489v1

IAU Symp.Proc. 249 (2008) 319-324

Astronomy and Astrophysics

Astrophysics

6 pages, 5 figures, to appear in the Proceedings of the 249th IAU Meeting: "Exoplanets: Detection, Formation and Dynamics" (Su

Scientific paper

10.1017/S1743921308016773

Understanding the formation and dynamical evolution of habitable planets in extrasolar planetary systems is a challenging task. In this respect, systems with multiple giant planets and/or multiple stars present special complications. The formation of habitable planets in these environments is strongly affected by the dynamics of their giant planets and/or their stellar companions. These objects have profound effects on the structure of the disk of planetesimals and protoplanetary objects in which terrestrial-class planets are formed. To what extent the current theories of planet formation can be applied to such "extreme" planetary systems depends on the dynamical characteristics of their planets and/or their binary stars. In this paper, I present the results of a study of the possibility of the existence of Earth-like objects in systems with multiple giant planets (namely Upsilon Andromedae, 47 UMa, GJ 876, and 55 Cnc) and discuss the dynamics of the newly discovered Neptune-size object in 55 Cnc system. I will also review habitable planet formation in binary systems and present the results of a systematic search of the parameter-space for which Earth-like objects can form and maintain long-term stable orbits in the habitable zones of binary stars.

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