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Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
Type Ia supernovae (SNe Ia) play a vital role in the discrimination of different cosmological models. These events have been shown to be standardizable based on properties of their light curves during the early-time photospheric phase....
Chemical evolution of stellar plasma is one of the most critical components of computational models in stellar astrophysics. Nuclear abundance distributions resulting from chains of nuclear reactions serve as a key comparison tool...
The gas within dark matter halos of galaxies and clusters contains information about the baryon content of the universe that is not found anywhere else. Precise understanding of the nuances of this gas is critical to understanding the...
Type II supernovae (SNe II) are excellent tools for studying stellar evolution, mass loss, cosmology, and to probe possible explosion mechanisms. By examining the spectroscopic diversity of SNe II, this thesis aims to improve the...
The identities of the progenitors of type Ia supernova (SN Ia) has long been under study and remains an unsolved problem of astrophysics. The answer to this question will impact cosmology and subfields such as galactic evolution. To help...
Two leading theories exist to explain the progenitor models of Type Ia supernovae. In the single-degenerate scenario (SDS), a carbon-oxygen white dwarf slowly accretes matter from a non-degenerate binary companion that is exceeding its...
Type Ia supernovae (SNe Ia) are rather homogeneous astrophysical objects and can be used as cosmological distance ladders. Despite that, significant diversity among SNe Ia luminosity (by a factor of ~ 10) and spectral properties have...
Observations indicate that massive stars ends their lives violently, but exactly how massive they need to be remains an astrophysical challenge. Stellar evolution predicts make two fundamental predictions about the fate of massive stars....
This dissertation describes our research into the properties of the interstellar medium (ISM) through the lens of numerical magnetohydrodynamical (MHD) simulations. Our research explores the prob- ability distribution functions (PDF) of...
Understanding the theory of how massive stars die is an important astrophysical challenge. An important result in core-collapse supernova (CCSN) theory is that spherically-symmetric, one-dimensional simulations routinely fail to explode, ...
Type Ia supernovae (SNe Ia) mark the beginning and the end of stellar evolution. They are one of the most powerful cosmological probes in our universe thanks to their high intrinsic luminosities and standardizable properties. In the...
We performed forecasts of the uncertainty with which future surveys will measure the cosmological parameters of the non-flat ΛCDM model, extended to include the sum of neutrino masses Σν, and the effective number of relativistic species...
In astrophysical hydrodynamical objects, multiple physical processes take place on a wide variety of spatial and temporal scales simultaneously, making direct numerical simulation of such objects dicult computationally. Our work focuses...
Understanding how massive stars explode as core-collapse supernovae (CCSN) remains an important challenge in stellar evolution theory. When massive stars reach the end of their lives, the central iron core can no longer support the...
In various astrophysical and high-energy density plasma flows, the evolution and behavior of the magnetic field can greatly influence flow morphology and result in transient phenomena. Many existing magnetohydrodynamic codes used in...
Galaxy clusters are the largest gravitationally bound structures in the Universe, and they provide valuable insights into astrophysics and cosmology. One method of studying galaxy clusters - the Sunyaev-Zel'dovich Effect - involves using...
Using three magnified Type Ia supernovae (SNe Ia) detected behind CLASH (Cluster Lensing and Supernovae with Hubble) clusters, we perform a first pilot study to see whether standardizable candles can be used to calibrate cluster mass...
Massive stars play a crucial role in the universe. Yet, our understanding of massive stars remains incomplete due to their rarity, short lifetimes, complexity of binary interactions, and imprecise Galactic distances. An important...
The origins of Type Ia supernovae (SNe Ia) remain an unsolved problem of contemporary astrophysics. Decades of research indicate that these supernovae arise from thermonuclear runaway in the degenerate material of white dwarf stars;...
The radioisotope ²⁶Al has been well recognized as an important astronomical indicator of ongoing nucleosynthesis in our Galaxy due to it's unique nuclear properties. The ground-state of ²⁶Al (²⁶Al[superscript g]) has a half-life of 700...
In this dissertation we have created theoretical models for finite nuclei, nuclear matter, and neutron stars within the framework of relativistic mean field (RMF) theory, and we have used these models to investigate the elusive isovector...
Despite the triumph of Type Ia Supernovae measuring cosmological distances, many of the details of the origin and evolution of SNe Ia remain unknown or highly controversial. There is still much debate about the specifics of the earliest...
Computer modeling is extensively used to probe structure and evolution of stars and planets. These computations allow astrophysicists to connect theoretical models of star formation and evolution to astronomical observations. Because...
The Big-Bang theory is the most widely accepted description of the origin of the Universe, creating elementary particles and synthesizing light nuclei up to mass-7 within the first few minutes of the Big-Bang. Its parameters have been...
An ionized Very-High Velocity Cloud (VHVC, vLSR ∼ −350 km s−1 was recently discovered in multiple ion absorption lines (e.g., O i, C ii, Si ii, Si iii) in the sightline of M33 (Zheng et al. 2017). However, the VHVC’s origin is still...
One of the major challenges in stellar evolution theory is to understand how massive stars die. Most massive stars ($M > 8M_\odot$) undergo core collapse at the end of their lives. Some explode as a Core-collapse Supernova explosion, ...
This work details a package of experiments aimed at understanding low-energy resonances in $\bedfull$ for Big Bang Nucleosynthesis (BBN). Two indirect experiments involving the Super-Enge Split-Pole Spectrograph (SE-SPS) and the Silicon...
Some of the material in is restricted to members of the community. By logging in, you may be able to gain additional access to certain collections or items. If you have questions about access or logging in, please use the form on the Contact Page.
