Shanghai Astronomical Observatory Astrophysics Colloquium

Title：Observational Planetary Evolution Revealed by LAMOST-Gaia-Kepler

Speaker:Ji-Wei Xie(Nanjing University)

Time：3:00 pm June 05th (Thursday)

Tencent Meeting：42915400486 password: 6360

Location: Lecture Hall, 3rd floor

Abstract：

To date, over 5,700 exoplanets have been discovered, with thousands more candidates awaiting confirmation. Thanks to advancements in observational technology, the map of known exoplanets has expanded dramatically, reaching from the solar neighborhood (100-200 parsecs) to distances of up to several thousand parsecs within our Galaxy. This marks the dawn of a new era in the census of exoplanets in the Milky Way. A fundamental question in Galactic exoplanet research is: How do the properties of planetary systems vary across different positions and ages within the Galaxy? Answering this question will offer valuable insights into the formation and evolution of the diverse exoplanet populations found in various Galactic environments. In this presentation, I will discuss our recent work, which focuses on the age-dependence of different planet types (such as hot/warm/cold Jupiters, super-Earths/sub-Neptunes, and ultra-short period planets), leveraging data from surveys like LAMOST, Gaia, and Kepler to uncover evidence of their long-termevolution.

CV：

Dr. Ji-Wei Xie began his academic career in 2006 when he earned a Bachelor of Science degree in Astronomy from Nanjing University. He then pursued a joint PhD program at Nanjing University and the University of Florida, receiving his PhD in 2011. After completing his doctoral studies, he worked as a postdoctoral researcher at the University of Toronto from 2011 to 2013. Since 2014, he has been an Associate Professor at the School of Astronomy and Space Science, Nanjing University, and was promoted to Professor in 2020. Professor Xie's research endeavors encompass both theoretical and observational dimensions of exoplanetary science. In recent years, he has focused his research on conducting statistical analyses of large exoplanet samples, with the aim of enhancing our understanding of the remarkable diversity, formation mechanisms, and evolutionary pathways of planetary systems.