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Location
SHL215
Speaker
Gordan Richards, Drexel University
Host
Bianco
A modern view of quasars sees them as diverse*processes* as opposed to the traditional view as more static*things*. Such a picture is important both to understanding quasars themselves and also the role that they play in the evolution of galaxies. I will present some broad perspectives on the relationship between quasar physics and their spectral energy distributions (SED) from the X-ray to radio. In particular, I will discuss connections between the accretion rate, black hole mass, optical/UV continuum, radio loudness, broad absorption line properties, and emission line properties.
Location
SHL215
Speaker
James Sikora, Bishop's University
Host
Petit
Over the past several decades, a small but growing number of evolved stars, which rotate at speeds up to 75 times faster than the Sun, have been discovered. These elderly stars appear to defy our understanding of stellar evolution since they are expected to lose the bulk of their angular momentum much earlier in their lives. One proposed explanation for this mystery is that these stars are the products of stellar merger events.
Location
SHL215
Speaker
Masao Sako, University of Pennsylvania
Host
Bianco
The Dark Energy Survey (DES) completed its 6-year photometric survey of the southern sky, obtaining shape and color measurements of several hundred million galaxies and light curves of thousands of supernovae. I will present new cosmology measurements from Type Ia supernovae and prospects for the future. I will also discuss studies of other transients with DES including microlensing events, trans-Neptunian objects, and the elusive Planet Nine.
Location
SHL215
Speaker
Matthew Shultz, University of Delaware
Host
Gizis
Magnetic fields are found in about 10% of stars with radiative envelopes. They are typically strong, simple, stable, and are not maintained by contemporaneous dynamos, for which reasons they are described as 'fossil' fields, i.e. fields left over from an earlier period in a star's life. Amongst stars earlier than about B5, magnetic confinement of their powerful winds leads to the formation of magnetospheres which can be detected across the electromagnetic spectrum, and which in turn are expected to lead to rapid angular momentum loss.
Location
SHL215
Speaker
Somayeh Khakpash, Lehigh University
Host
Bianco
Microlensing is a powerful tool for discovering cold exoplanets, and the WFIRST microlensing survey will discover over 1000 such planets. The full modeling of each planetary microlensing event often requires significant investment of human and computing resources. When WFIRST releases light curves of thousands of microlensing events, it is important to detect the planetary systems fast, so an algorithm is needed to quickly classify all microlensing signals and prioritize rapid follow-up observations.