Photometric and spectroscopic observations of individual stars, binaries, and group of stars in coeval populations offer valuable insights into various stellar characteristics, such as chemical abundance, radial velocity, multiplicity, mass, distance, and age. The chemical abundances provide critical information about the internal physics of stars, the interactions between planets and their host stars, and the properties, formation, and evolution of planetary systems. This talk focuses on the use of stellar chemical abundances, especially lithium abundance, to investigate stellar interiors and the complexities of star-planet interactions. Lithium, which is both destroyed and produced within stars, is a key element for understanding internal stellar processes. This talk covers the lithium patterns in dwarfs and subgiants to confirm the role of rotational mixing, examines the internal and external factors that contribute to the formation of lithium-rich giants, and identifies the specific chemical abundance signatures that emerge following planet engulfment. Additionally, this talk discusses how the correlation between planetary and stellar atmosphere abundances can help distinguish between different planet formation scenarios. The observed trend of differential chemical abundance versus condensation temperature in solar-like stars may be influenced by the formation of terrestrial or giant planets.
BIO
Qinghui Sun joins TDLI Institute at Shanghai Jiaotong University as an Associate Research Professor in 2024. Previously, she was a Postdoctoral Shuimu Fellow at Tsinghua University. Qinghui earned her Ph.D. in Astrophysics from Indiana University in 2021 and B.S. in Astronomy from Nanjing University in 2015. She specializes in studying stellar properties and the interactions between planets and their host stars. Recently, her research interests have expanded to include observing facilities and instrumentation, and applying machine learning to astrophysics.
Host: Xuesong Wang
