Astrophysics Seminars

Feb
29
2024

Institute for Advanced Study Astrophysics Seminar

New Insights into Strong Gravity from Accreting Black Holes
Prashant Kocherlakota
11:00am|Bloomberg Lecture Hall

Recent horizon-scale images of Messier 87* and Sagittarius A* have been used to demonstrate that their spacetimes are well-described by the Kerr metric. The latter is a solution to the vacuum Einstein equations of general relativity, and is used to...

Feb
22
2024

Institute for Advanced Study Astrophysics Seminar

Pulsar magnetospheres and their radiation
Sasha Phillipov
11:00am|Bloomberg Lecture Hall

In this talk, I will review recent progress in understanding the complex multi-scale plasma physics of neutron star magnetospheres through the lens of first-principles particle-in-cell simulations. I will highlight pair production discharges near the...

Feb
15
2024

Institute for Advanced Study Astrophysics Seminar

Linear Inverse Problems, Quadratic Spectral Estimators & Spatiospectral Concentration to study Earth, Planets, and Space
11:00am|Bloomberg Lecture Hall

Many modern techniques to analyze global planetary signals, from satellite gravity and the geoid, to magnetic fields, to the making of seismological models, heavily rely on a global function basis - the spherical harmonics. When the available data...

Feb
08
2024

Institute for Advanced Study Astrophysics Seminar

Radio Astronomy from the Ends of the Earth
Jon Sievers
11:00am|Bloomberg Lecture Hall

Redshifted 21cm emission from neutral hydrogen is rapidly becoming one of our most powerful observables in cosmology. With it, we can study the evolution of dark energy at low/intermediate redshifts, the epoch of reionization, the first stars in the...

Feb
01
2024

Institute for Advanced Study Astrophysics Seminar

Circumbinary discs: Planet formation in a dynamically complex environment
Rebecca Martin
11:00am|Bloomberg Lecture Hall

Circumbinary discs around young stars have been observed to be misaligned to the binary orbital plane. A misaligned circumbinary gas disc evolves towards one of two states: alignment with the binary orbital plane or polar alignment where the disc is...

Dec
07
2023

Institute for Advanced Study Astrophysics Seminar

Exploring the Dynamics of Supercritical Accretion onto the Strongly Magnetized Neutron Stars
11:00am|Bloomberg Lecture Hall

Accretion-powered X-ray pulsars are neutron stars that accrete matter from a companion star in a binary system, which exhibit fascinating dynamics. The strong magnetic field of the neutron star guides material onto the magnetic poles, which are...

Nov
16
2023

Institute for Advanced Study Astrophysics Seminar

Data-Driven Strong Lensing Science in the Era of Large Sky Surveys
Laurence Perreault-Levasseur
11:00am|Bloomberg Lecture Hall

Despite the remarkable success of the standard model of cosmology, the lambda CDM model, at predicting the observed structure of the universe over many scales, very little is known about the fundamental nature of its principal constituents: dark...

Nov
08
2023

Institute for Advanced Study Astrophysics Seminar

The Albedos and Phase Curves of Celestial Bodies
11:00am|Rubenstein Commons | Meeting Room 5

The albedo of a celestial body is the fraction of incident starlight reflected by it. The study of the albedos of Solar System objects is at least a century old, at least in the Western world. As examples: Bond (1861) speculated on the near-unity...

Nov
02
2023

Institute for Advanced Study Astrophysics Seminar

GRMHD simulations of radiatively non-inefficient black hole accretion
Monika Moscibrodzka
11:00am|Bloomberg Lecture Hall

X-ray binaries are known to exhibit different spectral states which are associated with different black hole accretion modes. In particular the geometry of the hot accretion flow in hard spectral state is still not fully understood. Recent...