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Articles 1 - 30 of 67
Full-Text Articles in Physical Sciences and Mathematics
Constraining H0 Via Extragalactic Parallax, Nicholas Ferree
Constraining H0 Via Extragalactic Parallax, Nicholas Ferree
Honors Theses
We examine the prospects for measurement of the Hubble parameter 𝐻0 via observation of the secular parallax of other galaxies due to our own motion relative to the cosmic microwave background rest frame. Peculiar velocities make distance measurements to individual galaxies highly uncertain, but a survey sampling many galaxies can still yield a precise 𝐻0 measurement. We use both a Fisher information formalism and simulations to forecast errors in 𝐻0 from such surveys, marginalizing over the unknown peculiar velocities. The optimum survey observes ∼ 102 galaxies within a redshift 𝐻0max = 0.06. The required errors …
The Rotational Period Distribution Of Massive Magnetic White Dwarfs, Zorayda Martinez
The Rotational Period Distribution Of Massive Magnetic White Dwarfs, Zorayda Martinez
Honors Theses
Rapidly rotating white dwarfs (WDs) have the potential to come about by either double degenerate mergers or weak coupling between the core and the outer envelope during the asymptotic giant branch (AGB). For both cases, knowledge of the rotational period distribution places tight constraints on the evolution of angular momentum transfer. Here we present initial results from a study of the rotational period distribution of 19 massive (M > 0:9M), magnetic, DA WDs observed by the Transiting Exoplanet Survey Satellite (TESS) and 17 observed with ground-based telescopes and analyzed with the Lightkurve python package. We present periodograms, folded light curves, and …
Optimal Method For Reconstructing Polychromatic Maps From Broadband Observations With An Aysmmetric Antenna Pattern, Brianna Cantrall, Emory F. Bunn, Solomon Quinn
Optimal Method For Reconstructing Polychromatic Maps From Broadband Observations With An Aysmmetric Antenna Pattern, Brianna Cantrall, Emory F. Bunn, Solomon Quinn
Honors Theses
Broadband time-ordered data obtained from telescopes with a wavelength-dependent, asymmetric beam pattern can be used to extract maps at multiple wavelengths from a single scan. This technique is especially useful when collecting data on cosmic phenomena such as the Cosmic Microwave Background (CMB) radiation, as it provides the ability to separate the CMB signal from foreground contaminants. We develop a method to determine the optimal linear combinations of wavelengths (“colors”) that can be reconstructed for a given telescope design and the number of colors that are measurable with high signal-to-noise ratio. The optimal colors are found as eigenvectors of a …
Membership Probabilities Of White Dwarfs In Open Star Clusters, Sarah Phillips
Membership Probabilities Of White Dwarfs In Open Star Clusters, Sarah Phillips
Honors Theses
This thesis explores the relationship between astronomical position data and star cluster membership. Our research project focuses on the mathematical probability of cluster membership for white dwarf stars (WDs), specifically membership candidates within the open cluster Messier 35. Through Gaussian analysis of proper motion data, we examine the membership probability of each candidate. Establishing cluster membership has broad applications and can allow further determination of a star’s characteristics including stellar age and evolution. Of particular interest are two WD member candidates for Messier 35: LAWDS 4, a DB WD with a helium-dominated atmosphere as opposed to the more common hydrogen-dominated …
Evaluating Neutron Star Binding Energies Using Rotating Accreting Models, Nathan Moore
Evaluating Neutron Star Binding Energies Using Rotating Accreting Models, Nathan Moore
Honors Theses
Neutron star binding energy increases due to accreting matter from neighboring astronomical bodies, and decreases due to the star spinning up, increasing its angular velocity. We present a novel set of models that account for both increasing angular velocity and accreting matter to track a neutron star’s evolution. We arrive at these models through studying and reconfiguring computational investigations from the past, particularly a code which generates a model for a given fixed baryon mass and angular velocity and another that takes it from one baryon mass and angular velocity to the next one through accretion, to obtain a full …
Investigating The Thermodynamics And Seismic Profile Of The Europan Hydrosphere Through Pure-Water Modeling And Saltwater Experiments, Samantha Rosenfeld
Investigating The Thermodynamics And Seismic Profile Of The Europan Hydrosphere Through Pure-Water Modeling And Saltwater Experiments, Samantha Rosenfeld
Honors Theses
We explore the properties of the hydrosphere on Europa involving both a modeling technique and experimental methods. We perform a computational analysis of the thermodynamic properties for an ideal, pure-water Europan ice shell using a Python programming framework called SeaFreeze. We create four models assuming surface temperatures of either 50 K or 140 K and ice shell thicknesses of either 3 km or 30 km. We observe mostly linear trends for the density and seismic wave velocities with respect to depth and find that surface temperature has the greatest effect on the models. Simultaneously, we experimentally investigate the phase diagram …
Statistical Effects Of Synthetic Template Mismatch With Model Deimos Observations, Christos Kakogiannis
Statistical Effects Of Synthetic Template Mismatch With Model Deimos Observations, Christos Kakogiannis
Honors Theses
High-precision kinematics of individual stars in Milky Way satellite galaxies and globular clusters is crucial for studies of galaxy formation, cosmology, alternative gravity models, and dark matter. We tested a rigorous method that matches model DEIMOS observations of such targets with synthetic template spectra that deduces radial velocities and [Fe/H] abundances. We added noise to create a model spectrum with SNR = 30, fitted templates with different parameters to it, and calculated the
best-match velocity and the goodness of the fit. The best fits occur for templates that are close in parameter space to the model spectrum, and the fits …
Reinforcement Learning In A Quantum Network, Roy Pace
Reinforcement Learning In A Quantum Network, Roy Pace
Honors Theses
No abstract provided.
Observing And Exploring Intrinsic Characteristics Of Type Ia Supernova, Connor Langevin
Observing And Exploring Intrinsic Characteristics Of Type Ia Supernova, Connor Langevin
Honors Theses
No abstract provided.
An Argument For The Second Nuclear Era: Salvaging The Atomic Age In Response To Climate Change, Ian Sager
An Argument For The Second Nuclear Era: Salvaging The Atomic Age In Response To Climate Change, Ian Sager
Honors Theses
No abstract provided.
Spectroscopic Analysis Of Potential Astromolecules Via Quantum Chemical Quartic Force Fields, Mason Gardner
Spectroscopic Analysis Of Potential Astromolecules Via Quantum Chemical Quartic Force Fields, Mason Gardner
Honors Theses
Astrochemistry has been substantially aided by computational techniques, particularly through the use of Quartic Force Field (QFF) analysis. Several methods have proven useful at correlating computed spectroscopic data with experimental observations. The F12-TZ QFF correlated well with experimental data for silicon oxide compounds, particularly those potentially involved in development from rocky bodies to planetary masses [27]. Compared to argon matrix experimental data, the vibrational frequencies for the molecules SiO2, SiO3, Si2O3, and Si2O4 become less accurate as the complexity of the molecules increases but should still be predictive of infrared characteristics of silicon oxides as they form clusters in space …
Machine Learning Approach To Pattern Recognition In Nuclear Dynamics From The Ab Initio Symmetry-Adapted No-Core Shell Model, Oleksandr Molchanov
Machine Learning Approach To Pattern Recognition In Nuclear Dynamics From The Ab Initio Symmetry-Adapted No-Core Shell Model, Oleksandr Molchanov
Honors Theses
No abstract provided.
Identifying, Analyzing, And Using Discriminatory Variables For Classification Of Neutrino Signal And Background Noise In Multivariate Analysis In The Askaryan Radio Array Experiment, Jesse Osborn
Honors Theses
The Askaryan Radio Array Experiment, located near the South Pole, works to pinpoint specific instances of neutrinos from outside the solar system interacting with nucleons inside the Antarctic ice, emitting radio waves. I have taken data from the ARA stations which is presumed to be background noise and compared it to simulated data meant to look like a neutrino signal. I developed a suite of variables for discrimination between the two data sets, using a computer algorithm to generate a single output variable which can be used to distinguish noise events from signal events. I maximized this discrimination process for …
Investigating The Agn-Merger Connection Using Close Galaxy Pairs In The Candels Fields, Sean L. Dougherty
Investigating The Agn-Merger Connection Using Close Galaxy Pairs In The Candels Fields, Sean L. Dougherty
Honors Theses
Galaxy mergers are catastrophic events in that they greatly change the properties of the galaxies involved. Observations of the nearby universe suggest that they may also be able to trigger active galactic nuclei (AGN) even prior to the final coalescence, though there is much controversy surrounding this belief, particularly at high redshifts. In order to address this question, we have assembled a large sample of photometric galaxy pairs within the GDS and EGS fields of the CANDELS survey. We use photometric redshift probability distribution functions and the combined redshift probability function to assign probabilities for each projected pair. We incorporate …
Accuracy Of Personalized 3-D Printed Phantoms For Radiotherapy Applications, Margaret Carey
Accuracy Of Personalized 3-D Printed Phantoms For Radiotherapy Applications, Margaret Carey
Honors Theses
No abstract provided.
Finding Obscure Black Hole Growth Via Spectral Energy Distribution Modeling, Randall K. Chan
Finding Obscure Black Hole Growth Via Spectral Energy Distribution Modeling, Randall K. Chan
Honors Theses
An active galactic nucleus (AGN) occurs when the supermassive black hole at the center of the galaxy starts to grow. We still currently do not know what triggers AGN. Theories suggest that galaxy mergers could trigger AGNs, but past research has not been able to find a correlation between x-ray detected AGNs and disturbed galaxies. The present research looks specifically at AGN not detected in the x-ray, or obscured AGN. Using a newly updated IDL code, FAST, we were able to identify potential obscured AGN through spectral energy distribution (SED) modeling. We found a total of 526 obscured AGN in …
A Study On The Extrasolar Transits Of Wasp-89b, Wasp-32b, And Hat-P-23b, Conner Kelley
A Study On The Extrasolar Transits Of Wasp-89b, Wasp-32b, And Hat-P-23b, Conner Kelley
Honors Theses
No abstract provided.
Single And Multiparameter Estimation Using Multimode Interferometry And Single Photons, Margarite L. Laborde
Single And Multiparameter Estimation Using Multimode Interferometry And Single Photons, Margarite L. Laborde
Honors Theses
No abstract provided.
Geometric Design, John Marceaux
Spatiotemporal Properties Of Solid State Harmonics, Christopher Abadie
Spatiotemporal Properties Of Solid State Harmonics, Christopher Abadie
Honors Theses
No abstract provided.
Radiomic Feature Analysis And Classification Of Tumors For Serial Pre-Clinical Spect/Ct Data, Megan Chesal
Radiomic Feature Analysis And Classification Of Tumors For Serial Pre-Clinical Spect/Ct Data, Megan Chesal
Honors Theses
No abstract provided.
Some Results From The Lariat Experiment, Derek Walker
Some Results From The Lariat Experiment, Derek Walker
Honors Theses
No abstract provided.
Epoch, Latitude And Star Positions From Hipparchus’ Commentary, Irene Vargas-Salazar
Epoch, Latitude And Star Positions From Hipparchus’ Commentary, Irene Vargas-Salazar
Honors Theses
No abstract provided.
Optimized Multilayered Thermal Emitters For Photovoltaic, Lighting, And Countermeasure Technologies, Simón G. Lorenzo
Optimized Multilayered Thermal Emitters For Photovoltaic, Lighting, And Countermeasure Technologies, Simón G. Lorenzo
Honors Theses
No abstract provided.
Calculating And Analyzing Night Sky Brightness For The Commerce/Greenville, Texas Area, Rebecca Bosmans
Calculating And Analyzing Night Sky Brightness For The Commerce/Greenville, Texas Area, Rebecca Bosmans
Honors Theses
No abstract provided.
Modeling Pulsar Trajectories Through A Galatic Potential To Determine Birth Locations, Brent Shapiro-Albert
Modeling Pulsar Trajectories Through A Galatic Potential To Determine Birth Locations, Brent Shapiro-Albert
Honors Theses
Neutron stars are the remnants of massive stars after their deaths in supernova explosions. Some neutron stars, called pulsars, are detected as periodic emitters of radio waves at very precise intervals. Pulsars typically have higher velocities than their progenitor stellar population due to either kicks from supernova asymmetries or from remnant velocities of compact binaries after they are disrupted by explosions. Their velocities are large enough that pulsars will typically move large distances from their birth sites. By determining a pulsar's present day location and velocity, we project back to twice the pulsar's characteristic age to constrain the location of …
Constraining Cosmological Parameters Using The Correlation Function, Michael Warrener
Constraining Cosmological Parameters Using The Correlation Function, Michael Warrener
Honors Theses
As the European Space Agency prepares to launch the space telescope Euclid in 2020, we are interested in using its observations of galaxy clustering as a new geometry-based tool to constrain the cosmological parameters Ωm and ΩΛ. In this work, we use data simulated by Magneticum (a high-resolution cosmological structure simulation) to model the correlation functions of both galaxies and clusters at several redshifts. We fit analytic models to the simulated data centered at the baryon acoustic oscillation peak to extract both the matter density parameter Ωm and the dark energy density parameter ΩΛ: We find that the correct cosmology …
General Relativity And Differential Geometry, Harry Hausner
Formation And Characterization Of Environmentally Persistent Free Radicals O N Single Crystal A N D Nanoparticle Metal Oxide Surfaces, Mark F. Ditusa
Formation And Characterization Of Environmentally Persistent Free Radicals O N Single Crystal A N D Nanoparticle Metal Oxide Surfaces, Mark F. Ditusa
Honors Theses
No abstract provided.
A Monte Carlo Study Of The Pion Absorption And Charge Exchange Cross Section In Lariat, Andrew Olivier
A Monte Carlo Study Of The Pion Absorption And Charge Exchange Cross Section In Lariat, Andrew Olivier
Honors Theses
No abstract provided.