Long-duration gamma-ray bursts (GRBs) are the most luminous explosions in the Universe, visible out to cosmological redshifts. Almost every spectroscopically confirmed supernova (SN) associated with a long GRB has been hydrogen and helium poor with broad lines (Ic-bl), indicating a stripped massive star progenitor with fast winds that produced a highly-collimated jet viewed on-axis. A critical...
Fast Radio Bursts (FRBs) are highly energetic, ~millisecond duration bursts of radio emission with extragalactic origins that were discovered nearly 19 years ago. While there is some evidence suggesting FRBs may originate from magnetars, there still remains the question of whether all FRBs are produced by magnetars. One potential method for further understanding FRB progenitors is through...
Most of the baryonic mass in galaxy halos consists of diffuse, magnetized plasma, which is referred to as the circumgalactic medium (CGM). The properties of the CGM remain relatively unconstrained, as the low density of the gas makes it hard to image in most wavelengths of the electromagnetic spectrum. Fast radio bursts (FRBs) are thus incredibly good probes of this plasma, because they...
Fast radio bursts (FRBs) are short-duration (ms), bright (Jy-kJy) bursts of radio emission, generally originating from cosmological distances. Although thousands of FRB events have been published, the progenitor and emission mechanism of FRBs are still not well understood. While most FRBs appear to be one-off events, ~2% of FRBs have been observed to repeat. The Canadian Hydrogen Intensity...
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has been an instrumental telescope in shaping our understand of transient sky by detecting the vast majority of known fast radio bursts (FRBs) using its CHIME/FRB backend. The recently launched CHIME All-Sky Multiday Pulsar Stacking Search (CHAMPSS) uses data from this backend to perform a pulsar periodicity search with unprecedented...
Fast radio bursts (FRBs) are micro-to-millisecond-duration radio transients originating from extragalactic distances. While thousands of FRBs have been detected, their origins remain unknown. Many FRB theories invoke highly magnetised neutron stars, called magnetars, as FRB progenitors. In this talk, I will evaluate the magnetar progenitor scenario using recent results from the CHIME/FRB...
Stripped-envelope core-collapse supernovae are the violent explosions that mark the death of a massive star that had some or all of its outer H and He layers stripped off. One class of stripped-envelope supernovae is the rare Type Ic-BL; these are the only events associated with the detection of a long-duration gamma-ray bursts, but it is still unclear why only some Ic-BLs accompany a...
Polarization observations provide a unique opportunity to probe the geometry and structure of astrophysical magnetic fields. In the Milky Way, Supernova remnants (SNRs) are a key environment for connecting polarized emission to the physical processes tied to shaping the magnetic field: shocks, turbulence, and instabilities. By studying the organization of the on-sky polarization angle (PA) in...
Relativistic jets launched from accreting compact objects are thought to play an important role in the Universe, influencing large-scale processes such as galaxy evolution and star formation. However, the connection between their properties and those of the accretion flow remains poorly understood. Multi-wavelength time-domain observations of black hole X-ray binaries provide a new avenue to...
Fast radio bursts (FRBs) are energetic millisecond-duration bursts with extragalactic origins. Roughly 4000 unique sources have been observed to date, about 3% of which have been seen to repeat, though it remains unclear whether all FRBs repeat.
An FRB population study addresses several key questions: How often do FRBs occur in the universe? What energy and redshift distributions do they...
Fast radio bursts (FRBs) are millisecond-duration radio transients originating at extra-galactic distances. Their morphologies, the signal’s evolution as a function of time and frequency, encode valuable information about their emission physics as well as intervening plasma and magnetic fields. For example, we aim to measure the temporal spacing between sub-bursts, their changes in bandwidth...
Fast radio bursts (FRBs) are millisecond-duration extragalactic radio transients, a subset of which repeat. Multipath propagation through ionized media convolves each burst with a one-sided exponential, producing a scattering tail whose timescale scales steeply with frequency, τ ∝ ν^α with α ≈ −4. An observed burst width, however, also carries contributions from intrinsic emission,...
The Vera C. Rubin observatory is the premier optical transient facility on sky today. Many transient sources are point sources embedded in a host galaxy. This necessitates the subtraction of that host's light before examining the brightness over time, light curve, of the transient. Standard practice is to stack images from before the transient to then subtract and reveal the changing light...
Global 21-cm experiments are designed to capture the sky-averaged 21-cm signal emitted by neutral hydrogen and use it to probe the conditions present during the earliest epochs of the universe. Other experiments, such as EDGES and SARAS 3, probe the signal produced during the era of cosmic dawn; however, their reported results are in tension with each other. One proposed explanation for the...
The formation of first-generation stars and galaxies marks the onset of Cosmic Dawn. The Epoch of Reionization ensues when these structures emit ultraviolet light that ionizes neutral hydrogen in the universe. Although these epochs are some of the least understood, the 21 cm signal, which is emitted from the spin flip transition of neutral hydrogen's ground state, is a promising probe for...
The nature of dark matter is among the most longstanding mysteries in physics and astronomy, with its detection potentially enabling a deeper understanding of physics beyond the standard model. One of the most promising candidates for dark matter is the weakly interacting massive particle (WIMP), which has become the subject of various dark matter searches across the world. The Super Cryogenic...
The nature of cosmic acceleration remains an open question, with Modified Gravity (MG) providing an alternative to dark energy models within General Relativity. Cosmic voids are particularly sensitive tracers of MG and their two-point clustering captures higher order density field statistics. Since conventional two-point statistics are primarily dominated by overdensities, we use the marked...
Inflation is a proposed period of accelerated expansion in the early universe, providing a mechanism for generating the primordial fluctuations that seeded cosmic structure. Many inflationary models are able to match the large-scale observations of the CMB and LSS, whilst differing in their dynamics and small-scale characteristics. Nonlinear effects could provide additional information about...
