Joint IAS Princeton University Astrophysics Colloquium

Mar
05
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Planet Nine from Outer Space
Matt Brown
11:00am|Peyton Hall Auditorium

Astronomers have been predicting and searching for planets beyond Neptune for almost 180 years. In all previous cases the predictions were based on bad data, bad physics, or both, and the predictions turned out to be wrong. In 2016, we joined this ...

Feb
27
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Towards EeV neutrino astronomy with GRAND
Kumiko Kotera
11:00am|Peyton Hall Auditorium

We are living exciting times: we are now able to probe the most violent events of the Universe with diverse messengers (cosmic rays, neutrinos, photons and gravitational waves). One challenge to complete the multi-messenger picture resides in the...

Feb
20
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Finding Relativistic Stellar Explosions as Fast Optical Transients.
Anna Ho
11:00am|Peyton Hall Auditorium

For the last half-century, relativistic outflows accompanying the final collapse of massive stars have predominantly been detected via high-energy emission, as long-duration gamma-ray bursts (GRBs). Yet, it has long been hypothesized that GRBs are...

Feb
13
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Measurements of the Expansion Rate of the Universe and the Lingering Hubble Tension
Dan Scolnic
11:00am|Peyton Hall Auditorium

The standard model of cosmology has passed every test over the last twenty years. Yet it remains unsatisfactory, with 95% of the universe being dark components, whose nature we did not understand. Now, there are possible ‘cracks’ in the model, as...

Feb
06
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Black hole accretion in the TDAMM Era
Erin Kara
11:00am|Peyton Hall Auditorium

Most of the power from an Active Galactic Nucleus is released close to the black hole, and thus studying accretion at event horizon scales—at the intersection of inflow and outflow—is essential for understanding how much matter accretes and grows...

Jan
30
2024

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

New views of planetary and brown dwarf atmospheric physics and chemistry with JWST
Jonathan Fortney
11:00am|Peyton Hall Auditorium

JWST has enabled high-fidelity infrared spectroscopy for a wide range of transiting planets, directly imaged planets, and brown dwarfs.  In the past year, for transiting planets, observers have detected several molecules for the first time in an...

Dec
05
2023

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Cosmology and Galaxy Formation at the Crossroads
Michael Boylan-Kolchin
10:30am|Wolfensohn Hall

We find ourselves at a pivotal era in the study of cosmology and galaxy formation. The dark energy + cold dark matter (ΛCDM) paradigm is firmly established as the default cosmological model, owing in large part to its incredible success in...

Nov
28
2023

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Star Formation in Nearby Galaxies: New Insights from 100,000 Star Clusters and Associations
Janice Lee
10:30am|Wolfensohn Hall

Star clusters are a key product of star formation. They trace the densest peaks of the star formation hierarchy, and as (effectively) single-age populations, they have great utility as “clocks” for timing various phases of the star formation cycle...

Nov
21
2023

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Subaru Hyper Suprime-Cam Year 3 Cosmology results: S8 tension?
Masahiro Takada
10:30am|Wolfensohn Hall

We used more than 25 million galaxies in the Subaru Hyper Suprime-Cam (HSC) shear catalog in the redshift range up to z~1.5 to measure weak lensing distortion effects due to large-scale structures. We used the measured weak lensing signals to...

Nov
14
2023

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

How much (robust) cosmological information can we obtain from galaxy clustering?
Fabian Schmidt
10:30am|Wolfensohn Hall

All large-scale structure cosmologists are faced with the question: how do we robustly extract cosmological information, such as on dark energy, gravity, and inflation, from observed tracers such as galaxies whose astrophysics is extremely complex...