Past Colloquia
Colloquium with Keith Vanderlinde
Cody Hall
Prof. Keith Vanderlinde
March 12, 2025
2:00pm - 3:00pm
More information coming soon…
Stellar Variability from Minutes to Decades
Cody Hall
Jim Davenport, University of Washington
March 05, 2025
2:00pm - 3:00pm
The past 20 years has seen a revolution in stellar astrophysics driven by high precision data, high cadence data for millions of stars from exoplanet hunting telescopes such as Kepler and TESS. Surveys like ZTF, ASAS-SN, and the upcoming Rubin Observatory push us to explore…
Exploring the Nature of Habitable Sub-Neptunes: From Theory to the Lab
Cody Hall
Xinting Yu, University of Texas San Antonio
February 26, 2025
2:00pm - 3:00pm
Abstract: Sub-Neptunes, planets ranging in size between Earth and Neptune, are the most abundant type of exoplanets discovered to date. However, their nature remains enigmatic, as no such planets exist in our Solar System. Sub-Neptunes are hypothesized to be either bloated terrestrial planets (“super-Earths”), miniature…
Illuminating the Origins of Heavy Elements with Neutron Star Mergers
Cody Hall
Wen-fai Fong, Northwestern University
February 05, 2025
2:00pm - 3:00pm
When we look up at the night sky, we see a static universe. However, observational surveys have revealed that our universe is dynamic, with a myriad of transient events. One of the most captivating contributors to our transient universe are the mergers of neutron stars….
Tidal Sculpting of Short-Period Exoplanets
Cody Hall
Sarah Millholland, MIT
January 22, 2025
2:00pm - 3:00pm
Abstract: A large fraction of exoplanetary systems contain planets that orbit very close to their host stars. With orbital periods in the range of days to weeks, tidal forces become important and lead to significant orbital and physical effects on the planets. In particular, time-varying…
Black Hole Spectroscopy
Cody Hall
Prof. Emanuele Berti
January 15, 2025
2:00pm - 3:00pm
According to general relativity, the remnant of a binary black hole merger is a perturbed Kerr black hole. Perturbed Kerr black holes emit “ringdown” radiation which is well described by a superposition of damped exponentials (“quasinormal modes”), with frequencies and damping times that depend only…
Multi-messenger Hunt for Galactic PeVatrons
Cody Hall
Shuo Zhang, Michigan State University
December 11, 2024
2:00pm - 3:00pm
Abstract: Cosmic rays with energies up to a few PeV are believed to originate from our own galaxy. However, the origin of Galactic cosmic rays has remained a mystery for over a century since their discovery. Recent breakthroughs in neutrino and gamma-ray astronomy have provided…
It’s Raining Black Holes… Hallelujah!
Prof. Smadar Naoz. UCLA
December 04, 2024
2:00pm - 3:00pm
Abstract: The groundbreaking detection of gravitational waves from merging black holes has forever changed how we observe the Universe. Upcoming detectors, like the Laser Interferometer Space Antenna (LISA), will unlock new opportunities by allowing us to detect mergers between stellar-mass black holes (tens of solar…
Gravitational Lens Reveals Surprising Aspects of Newborn Super Star Cluster
Cody Hall
Prof. Liang Dai, UC Berkeley
November 27, 2024
2:00pm - 3:00pm
Abstract: Gravitational magnification by foreground galaxy clusters has provided us with the rare opportunity to witness star formation taking place in distant galaxies and under conditions that are among the most extreme throughout the Universe. Gravitating gas weighing millions to tens of millions of solar masses…
The Fates of Stars Orbiting too Close to Massive Black Holes
Cody Hall, 50 St. George Street
Prof. Quateart
November 20, 2024
2:00pm - 3:00pm
Abstract: Stars orbiting sufficiently close to massive black holes inevitably inspiral towards the black hole due to gravitational wave radiation. The fate of such stars is subtle and depends on an interplay between tidal heating of the star, mass transfer from the star to the…