Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 131 for “"Supernovae"”.
-
Deep learning for supernovae detection
In future astronomical sky surveys it will be humanly impossible to classify the tens of thousands of candidate transients detected per night. This thesis explores the potential of using state-of-the-art machine learning algorithms to handle this burden more accurately and quickly than trained …
-
THE PROGENITORS OF TYPE IIP SUPERNOVAE
Mass-loss prior to core collapse is arguably the most important factor affecting the evolution of a massive star across the Hertzsprung-Russel (HR) diagram, making it the key to understanding what mass-range of stars produce supernova (SN), and how these explosions will appear. It is thought that …
-
Luminous - Early Interactive Type II Supernovae
… optical and near infrared data for 5 type II-IIp Supernovae (i.e. SNe 2007od, 2009bw, 2007pk, 2009dd and 2010aj) and analyze them together with 3 other well studied objects (i.e. SNe 1993ad, 1995ad and 1996W) from Padua archive. These 8 objects constitute the biggest sample of bright type II …
-
Observational Investigations of the Progenitors of Supernovae
Supernovae (SNe) are the spectacular deaths of stars and have shaped the universe we see today. Their far-reaching influence affects the chemical and dynamical evolution of galaxies, star formation, neutron star and black hole formation, and they are largely responsible for most of the heavy …
-
Type Ia supernovae as tools for cosmology
Includes abstract. Includes bibliographical references (leaves 95-100).
-
Unravelling the nature of hydrogen-poor thermonuclear supernovae
Thermonuclear supernovae take many forms, as demonstrated by the increasing evidence of diversity among type Ia supernovae, particularly at early times, and subclasses of peculiar objects. This thesis presents new observations and modelling tools that explore the diversity of thermonuclear …
-
Core-collapse supernovae in the great survey era
… A main science goal of LSST is to detect Type Ia supernovae, but the survey will also revolutionize our understanding of core-collapse events. LSST will observe ~ 10^5 core-collapse supernovae per year out to z ~ 1 and obtain the cosmic supernova rate by direct counting, in an unbiased way and …
-
Bulk properties and physical characteristics of stripped-envelope supernovae
Stripped-envelope supernovae (SE-SNe) are a subset of core-collapse supernovae; the explosive death of a massive star. Their defining characteristic is the lack of promi- nent He and/or H envelope suggesting significant mass loss prior to explosion. Their progenitors may be high mass single stars …
-
LUMINOSITY DISTRIBUTIONS AND ABUNDANCE TOMOGRAPHY MODELLING OF TYPE IA SUPERNOVAE
I present an investigation into Type Ia Supernovae (SNe Ia). The aim of this investigation is to explain the physics and diversity of SNe Ia, motivated by the fact that, although SNe Ia are known to come from a thermonuclear explosion of a C+O Chandrasekhar mass (Ch-mass) White Dwarf (WD), their …
-
Supernova shrapnel: nearby supernovae and dust transport in the ISM
… extending previous analyses of Core-Collapse Supernovae (CCSNe) to include Electron-Capture Supernovae (ECSNe), Super-Asymptotic Giant Branch (SAGBs) stars, Thermonuclear/Type Ia Supernovae (TNSNe), and Kilonovae/Neutron Star Mergers (KNe). We revisit previous estimates of the ^60Fe and ^26Al …
-
A one dimensional model of convection in iron core collapse supernovae
… the newly formed neutron stars in core collapse supernovae, its role remains unclear. Much of the uncertainty concerning the role of convection may be attributed to the fact that the main tools for the investigation of convection in these supernovae are multi-dimensional codes. While these codes …
-
Exploring the nature and origins of low luminosity type IIP supernovae
… a subset of core-collapse SNe (CCSNe); type IIP supernovae (SNe). Type II supernovae are the most common type of core collapse supernova (CCSN), and are defined by the presence of H in their envelope. Type IIP SNe are a subgroup that display a distinctive ’plateau’ feature on their light curve …
-
Paleo-astronomy: investigations of terrestrial 60Fe forged in near-Earth supernovae
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-04-12 without embargo terms
-
Supernovae as gamma ray emitters from the MeV to the TeV
"Gamma rays offer unique probes of supernovae as cosmic-ray accelerators and as nucleosynthesis sites. My thesis work focuses on how to explore these two aspects of supernovae. (1) Both starburst galaxies and ultra luminous infrared galaxies are new gamma-ray source classes discovered by Fermi and …
-
Nuclear and particle interactions to multi-messenger signals: Core-collapse supernovae
… aspects related to both typical and rare supernovae. The diffuse supernova neutrino background (DSNB) - the isotropic background of ~10 MeV neutrinos from all past supernovae - is one such signal that does not rely on a local event for neutrino detection. We update several aspects of …
-
A Spectrograph for the Rapid Analysis of Transients and Classification of Supernovae
This thesis describes the design, construction and characterisation of a spectrograph operating in the optical range 4000-8000 Å and its application in the observation and classification of transient astronomical sources.
-
Investigating the presence and properties of circumstellar material in Type I Supernovae
… explosive deaths experienced by some stars in supernovae explosions has increased significantly over the last several decades, though many outstanding questions remain. The work presented here is comprised of two projects that seek to answer the role that circumstellar material plays in both …
-
Core-collapse supernovae: neutrino-dark matter phenomenology and probes of internal physics
… to probe this interaction is core-collapse supernovae as they release ~3x10^53 erg in neutrinos for each transient. However, more observations that constrain the internal physics of core-collapse supernovae are needed in order to better understand their neutrino emission. This dissertation …
-
Cosmic expansion in homogeneous and inhomogeneous universes : supernovae type Ia as cosmic probes
… assumes the universe and the distribution of supernovae to be statistically homogeneous and isotropic. Since the first version of the test is troubled by systematic effects, we modify the analysis to be independent of the calibration of the supernova absolute magnitude. As a result, all …
Page 1 of 7