Astrophysics Seminars

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...

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...

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...

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...

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...

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...

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...

Galactic microlensing is the only known method to discover dark objects ranging from isolated stellar-mass black holes (BHs) down to Earth-mass free-floating planets (FFPs). The recent success of interferometric resolution of microlensed images with...

Charge-exchange (CX) collisions of the solar wind (SW) high-ionization-state minor ions with LISM neutrals are responsible for much of X-ray production in the outer heliosphere. In this talk, we discuss numerical modeling of the heliospheric CX X...