To date, more than 3000 exoplanetary systems have been observed. Different kinds of planetary configurations are reported. Such as near-resonant configuration, closely packed multiple planetary systems, and systems with ultra-short-period planets. We proposed formation scenarios for these planetary configurations. For planet pairs in or near mean motion resonances (MMRs), they may be formed far away from the central star. Due to the existence of gas disk, they migrate to the inner region and captured into MMRs. Tidal effect makes planet pairs deviate from the exact location of MMRs to be near MMRs. The mass accretion process, the outer eccentric giant planets and the structure of gas disk are key factors for the formation of near MMRs configuration. For closely packed multiple planetary systems, mass loss of planets caused by photoevaporation is an important parameter affecting the stability of the system. The resonant planets’ post-formation implys an upper limit (=10%) on the amount of atmospheric mass loss in order to preserve the configuration of compact multiple plaentary systems. Systems like WASP-47 with ultra-short-period planet and hot Jupiter can be fromed by the combined effect of giant planet perturbation continually and tidal effect of central star.
BIO
Su Wang is an associate professor of Purple Mountain Observatory. She got her PhD in 2010 from Nanjing University. She was a visiting scholar at UCSC in 2016-2017. Her major research topics include dynamics and formation of planetary systems, shape models and internal structure of small bodies, origin and formation of small bodies in the Solar systems.
Host: Chris Ormel
