Migrating Planets

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

The discovery of roughly thirty extra solar planets over the last five years has profoundly altered our view of planet formation. The methods used to find the planets are sensitive to Jupiter mass bodies in orbits having periods less than about five years. With the caveat that the current searches are probably only marginally sensitive to systems like our own, the two main findings are that 1) Jupiter-mass planets are found in orbits with periods ranging down to three days, and 2) the distribution of orbital eccentricities is essentially uniform. The eccentricities show no obvious trends with planet mass or orbital period, aside from a lower limit on the orbit periapse that is consistent with expectations for tidal circularization. I will discuss theories for the origin of these ``short period Jupiters." I will point out observational tests that might allow us to choose amongst the competing theories.

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