Orbital determination and dynamics ofresonant extrasolar planetary systems

摘要

In this communication we review some properties and applications of mean-motionresonances in extrasolar planetary systems, with particular emphasis on the 2/1 commensura-bility. A first part is devoted to the dynamical structure of the 2/1 resonance, including (but notrestricted to) the so-called apsidal corotations. In a second part we discuss the orbital evolutionof resonant systems under the effects of non-conservative forces. Special attention is given tothe use of apsidal corotations as markers of largescale orbital decay, possibly due to disk-planetinteractions in primordial times. Finally, we analyze the interplay between dynamical analysisand orbital fitting. Using the HD82943 planetary system as an example, we discuss: (i) up towhat point present orbital fits allow us to distinguish between different resonant configurations,and (ii) in what ways may the dynamical structure of resonances be used as a complementarypart of the orbital fitting process.