Astrophysics

Building on decades of effort, Lizhong Zhang, Member (2023–24) in the School of Natural Sciences; James Stone, Professor in the School; and a team of astrophysicists have achieved a major milestone: developing the most comprehensive model to date of luminous black hole accretion. Their breakthrough allows scholars to "observe" such black hole systems not through a telescope, but through a computer.

When massive objects like black holes move through the universe, they create gravitational waves—ripples in the very fabric of spacetime. This summer, IAS became a hub for exploring this rapidly evolving field as the 2025 Prospects in Theoretical Physics (PiTP) program welcomed 85 attendees for an intensive workshop focused on gravitational wave physics and astrophysics.

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the School of Natural Sciences, has discovered an extraordinary trans-Neptunian object (TNO) at the edge of our solar system. The TNO is potentially large enough to qualify as a dwarf planet, the same category as the much more well-known Pluto. The discovery has significant implications for our understanding of the Kuiper Belt and hypotheses that surround the existence of Planet Nine.

A small team led by Sihao Cheng, Martin A. and Helen Chooljian Member in the School of Natural Sciences, has discovered an extraordinary trans-Neptunian object (TNO) at the edge of our solar system. The TNO is potentially large enough to qualify as a dwarf planet, the same category as the much more well-known Pluto. The discovery has significant implications for our understanding of the Kuiper Belt and hypotheses that surround the existence of Planet Nine.

Itai Linial, Member (2022–23); Shi-Fan Chen, Member (2022–25); and Nadine Soliman, Member (2025–30), all from the School of Natural Sciences, have received 2025 Astrophysics Postdoctoral Fellowships from NASA. The trio will join an “outstanding” class of fellows to address questions such as “How does the universe work?” and “How did we get here?”

Yue Hu, NASA Hubble Fellow in the School of Natural Sciences, has been announced as one of the recipients of the 2025 Cecilia Payne-Gaposchkin Doctoral Dissertation Award in Astrophysics. Hu's thesis was praised for opening "new ways of exploring the properties of astrophysical turbulent magnetic fields."

Chris Hamilton, John N. Bahcall Fellow in the School of Natural Sciences, has been recognized in the 2024 Early Career Collection of the Physics of Plasmas journal for his “outstanding” paper on stellar systems and kinetic theory, a prestigious accomplishment for emerging physics scholars.

This month, an effort to unite three astrophysical research communities who exploit common techniques to understand waves in gaseous disks, galaxies, and stars was made by three scholars from the School of Natural Sciences. John N. Bahcall Fellow Chris Hamilton and Members Callum W. Fairbairn and Uddipan Banik organized a workshop titled IAStrophysical Waves, at which over thirty astrophysicists from across the globe were in attendance.