Small planets between the size of Earth and Neptune are the most common in our Galaxy, and yet, their composition is poorly understood. Planet interior models predict a huge range of possible compositions and diverse types of planets such as water worlds, small planets with thick atmospheres, and lava planets. The study of planetary composition provides valuable insights into the formation and evolution of exoplanets since their physical properties reflect their natal environments as well as their dynamic histories. In this talk, I will present various observational studies highlighting the compositional diversity and demographics of small planets. I will show how we can use the abundances of refractory elements of host stars to alleviate degeneracies in the composition of small planets, and how we can also use these to make more reliable and physically motivated planet classifications. Finally, I will discuss the differences between the composition of isolated planets versus those residing in multi-planet systems, as well as differences in the properties of their host stars and what such a comparison tells us about the formation mechanisms and origin of these two architectures.

Host: Evan Fitzmaurice

Seminar held in 538 Davey or please email CEHW-SEMINAR-QUESTIONS@lists.psu.edu to attend virtually.