Dr. Steinn Sigurdsson
University of Florida Astronomy Colloquium - Sept. 17, 2008
Planets have been found in extreme systems; we have found planets
where detection techniques have the requisite sensitivity. New
theoretical modeling suggests that habitable terrestrial planets may
be found in many of the already known "hot Jovian" systems of giant
planets orbiting close to their host stars. In our models,
protoplanetary cores survive the migration phase, in which the giant
planets move from the outer orbits in which they form, to the warm
inner system, with the terrestrial planetary embryos re-assembling
into water rich terrestrial planets in the habitable zone, outside
the orbit of the giant planets, quite unlike the solar system.
Earths are likely to be common, not rare, and we should anticipate a very wide range of possible planetary systems and sites for life to start and evolve.