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Friday, September 21, 2018
2:00 PM - 3:00 PM
Cahill 370

TAPIR Seminar

Frequency and Internal Structure of Multi-planet Systems
Wei Zhu, Postdoctoral Fellow, CITA,

Similar to our Solar system, majority of the extra-solar planetary systems also contain multiple planets across several decades in mass and orbital separation. Therefore, knowing the frequency and the internal structure of the multi-planet systems is important toward a correct understanding of planet formation and evolution. In the first part of this talk, I will explain how we reduced the frequency of planetary systems from "more than 50%" to 30% by combining the transit and transit timing variation techniques. Then I will extend the "planet ladder" to larger separation, present the strong correlation between close-in small planets and distant giants, and discuss the implications. In the end, I will switch gear to gravitational microlensing, using (likely) the first pair of microlensing planets near mean-motion resonance to discuss the importance of this technique in the overall planet distribution.

For more information, please contact JoAnn Boyd by phone at 4280 or by email at