Joint IAS Princeton University Astrophysics Colloquium

Jan
31
2023

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Mixing and Unmixing in Planets
Dave Stevenson
10:30am|Princeton University, Peyton Hall Auditorium

Planets are not layered in general. The strong evidence of layering on Earth arises because the main components (mantle and core) are immiscible. This is a thermodynamic property and nothing to do with gravity. However, immiscible phases can...

Nov
22
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Multiphase and multi-scale AGN feedback processes
Dominika Wylezalek
10:30am|Wolfensohn Hall

AGN feedback is now widely considered to be one of the main drivers in regulating the growth of massive galaxies. In my talk I will describe several efforts in our group to understand the power, reach and impact of AGN feedback processes. We find...

Nov
15
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

First detection of an isolated black hole, and mass measurement of isolated white dwarfs through astrometric microlensing
10:30am|Wolfensohn Hall

We recently detected an isolated stellar-mass black hole (BH) unambiguously for the first time, and measured its mass, distance and velocity. We used HST to carry out precise astrometry of the source star of the long-duration, high-magnification...

Nov
08
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Physics We Learned with the Event Horizon Telescope
Dimitrios Psaltis
10:30am|Wolfensohn Hall

The Event Horizon Telescope has allowed us to obtain direct images of two
black holes, the one in the center of the M87 galaxy and the one in the center of the
Milky Way, with horizon-scale resolution, full polarization, and timing information.
...

Nov
01
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

The All-Sky Automated Survey for Supernovae (ASAS-SN)
Ben Shappee
10:30am|Wolfensohn Hall

For the first time, the entire visible sky is being surveyed for the violent, variable, and transient events that shape our universe by the All-Sky Automated Survey for Supernovae (ASAS-SN). Combined, ASAS-SN, Asteroid Terrestrial-impact Last Alert...

Oct
25
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

The small-scale structure of dark-matter halos
Jo Bovy
10:30am|Wolfensohn Hall

Much about dark matter remains unknown and much can be learned about its nature from its distribution on sub-galactic scales. I will discuss measurements of the small-scale structure of dark matter in elliptical galaxies and in the Milky Way from...

Oct
11
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

New Insight into Cosmology and the Galaxy-Halo Connection from Non-Linear Scales
Frank van den Bosch
10:30am|Wolfensohn Hall

In our LCDM paradigm, galaxies form and reside in dark matter halos. Establishing the (statistical) relation between galaxies and dark matter halos, the `Galaxy-Halo connection', therefore gives important insight into galaxy formation, and also is a...

Oct
04
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

Maps of the campus and of IAS housing can be found here: https://www.ias.edu/campus-resources/transportation. Parking Lot A is no longer available due to construction. The Auxiliary Lot is available.
Alex Schekochihin
10:30am|Wolfensohn Hall

Much of existing plasma (astro)physics is done hovering in the vicinity of a Maxwellian equilibrium, which is the maximum point of the standard Gibbs entropy and is achieved dynamically by means of two-particle collisions. In this seminar, I would...

Sep
27
2022

Institute for Advanced Study / Princeton University Joint Astrophysics Colloquium

A continuous theory for the origin of stellar systems
Kaitlin Kratter
10:30am|Wolfensohn Hall

A satisfying theory for star or planet formation should not consider these processes in isolation. With the power of recent observational surveys, we are well positioned to test detailed theoretical models of multiple-star formation and orbital...