Title：Astrometric detection of exoplanets, dark objects, and gravitational waves

Speaker: Fabo (Shanghai Jiao Tong University Tsung-Dao Lee Institute)

Time：3:00 pm May 29th (Thursday)

Tencent Meeting：42915400486 password: 6360

Location: Lecture Hall, 3rd floor

Abstract：

Gaia has released high-precision astrometry for over 1 billion celestial objects, achieving a precision as fine as 20 microarcseconds. While more than 400,000 non-single stars with high signal-to-noise ratios have been cataloged, small astrometric signals caused by exoplanets, dark objects such as black holes, and gravitational waves remain largely unidentified. To confidently detect these signals, we have developed advanced tools for combined analyses of Gaia catalog data alongside other data types, including radial velocity, timing, and direct imaging. By applying these tools to various targets, we have successfully identified hundreds of exoplanets, brown dwarfs, and stellar-mass black holes. These tools hold potential for further discoveries, including gravitational waves, isolated black holes, and dark matter subhalos. The forthcoming release of astrometric epoch data in Gaia DR4 will enhance the precision of astrometric measurements, enabling the discovery of large populations of exoplanets and dark objects  as well as gravitational waves when combined with other datasets.

CV：

Fabo obtained his bachelor's degree from Wuhan University, a master's degree from Nanjing University, and a Ph.D. from the Max Planck Institute for Astronomy and Heidelberg University in Germany. Afterward, he conducted research on exoplanet detection at the University of Hertfordshire in the UK and the Carnegie Institution for Science in the United States. In 2020, he returned to China and joined the Shanghai Jiao Tong University Tsung-Dao Lee Institute, where he was selected as an Overseas Excellent Young Scholar in 2021. He has discovered and confirmed over 200 exoplanets and identified a stellar-mass black hole. He is currently leading several projects, including the Tianyu project, JUST exoplanet science, and gravitational wave detection with Gaia.