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.
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Showing 1 to 20 of 37 for “"core collapse"”.
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Stellar iron core collapse in {3+1} general relativity and the gravitational wave signature of core-collapse supernovae
… first ever calculations of rotating stellar iron core collapse in {3+1} general relativity that start out with presupernova models from stellar evolutionary calculations and include a microphysical finite-temperature nuclear equation of state, an approximate scheme for electron capture during …
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Core-collapse supernovae in the great survey era
… 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 with high statistics. Many science applications will therefore be feasible. …
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The core collapse supernova rate in the sdss-ii supernova survey
… for cosmology, also discovered a large sample of core collapse supernovae (CCSN). I use the SDSS-II SN data to measure the volumetric CCSN rate in the redshift range (0.03 < z < 0.09), finding a volume-averaged rate of 0.98±0.18 ×10⊃−4⊃h⊂70⊂⊃3⊃yr⊃−1⊃Mpc⊃−3⊃. The CCSN luminosity function is also …
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A one dimensional model of convection in iron core collapse supernovae
… exist within 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. …
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Nuclear and particle interactions to multi-messenger signals: Core-collapse supernovae
… astronomy began when a massive star underwent core collapse in a neighboring dwarf galaxy, whose light and neutrinos reached Earth in 1987. Supernova 1987A was observed optically but was also observed through roughly two dozen neutrinos. Modern instruments have the ability to measure …
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Core-collapse supernovae: neutrino-dark matter phenomenology and probes of internal physics
… source 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 …
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Procedure di modellizzazione rapide per la caratterizzazione di Supernovae Core Collapse e di transienti similari
Le Supernovae da Collasso Gravitazionale (Core Collapse Supernovae, CC-SNe) rappresentano la fase finale dell'evoluzione di stelle sufficientemente massive (M_{ZAMS} > 8-10 M_\odot). Questi eventi sono tra i fenomeni più energetici dell'Universo (con energie di esplosione tipiche dell'ordine di …
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Detection of core-collapse supernovae through joint analysis of LIGO gravitational wave and KamLAND neutrino data
Introduction: Core collapse supernova are one of the most intriguing astrophysical phenomena. The dying stage of a supergiant star, they occur when the star collapses into a protoneutron star, causing a shock wave and a gamma ray burst. High energy neutrinos are released in this process and offer …
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Very old and very young compact objects : X-ray studies of galactic globular clusters and recent core-collapse supernovae
… globular clusters and X-ray studies of recent core collapse supernovae. My analyses of the Chandra X-ray Observatory observations of the globular clusters NGC 6752 and NGC 6440 revealed as many low-luminosity X-ray sources as was in the entire census of globular cluster sources with the …
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The Science of Gravitational-Wave Sources and Beyond Compact Binary Coalescences
… from compact binary coalescences. Focusing on core-collapse supernovae as promising sources for short gravitational-wave transients, this work reports optically targeted searches for gravitational-wave emitted by core-collapse supernovae during the third observing run of the LIGO and Virgo …
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On understanding the lives of dead stars : Supernova Remnant N103B, radio pulsar B1951+32, and the Rabbit
… supernova, in favor of the massive progenitor, core-collapse hypothesis indicated by earlier radio and optical studies, and by some recent X-ray results. We present our latest two-temperature shock and two-dimensional spatial-spectral modeling of the remnant. If the massive progenitor conclusion …
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Detector Improvements and Optimization to Advance Gravitational-wave Astronomy
… I also explore the detection prospects of core-collapse supernovae with the third-generation facilities -- Cosmic Explorer and Einstein Telescope. I find that the weak gravitational-wave signature from core-collapse supernovae limits the likely sources within our galaxy. This corresponds to …
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Numerical MHD Simulations in Dynamical Spacetimes
… in astrophysical phenomena such as stellar collapse to black holes, binary neutron star mergers, supernovae, and gamma-ray bursts. Many of these phenomena are promising sources of GWs for detectors such as LIGO (the Laser Interferometer Gravitational Wave Observatory). The complex interplay …
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Investigating the presence and properties of circumstellar material in Type I Supernovae
… role that circumstellar material plays in both core-collapse and thermonuclear supernovae, including its effects on single objects both in the generation of spectroscopic signatures and additional luminosity through interaction with supernova ejecta. As well as the information that can be …
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Exploring the nature and origins of low luminosity type IIP supernovae
… thesis I investigate the origins of 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 …
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Isotopic and Elemental Compositions of Stardust and Protosolar Dust Grains in Primitive Meteorites
… large <super>18<super>O excesses and come from core collapse supernovae. The next most abundant fraction of grains comes from high metallicity AGB stars of approximately solar mass. A minor fraction of the grains exhibit large excesses in <super>16<super>O and formed in core collapse supernova …
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Equipartition and mass segregation : simulations of star clusters with two mass-components
… We also examine the cluster properties like the core collapse, the evolution of the central potential, the radial stratification of masses as well as escapers. We present new, high-accuracy collisional N-body simulations, using the high-order integrator NBODY6++. We modelled up to N=20,000 …
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Dynamics and evolution of dense stellar systems
… that have survived tidal disruption undergo deep core collapse, followed by gravothermal oscillations.
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Refinements and improvements to a phenomenological model for the jet opening angles of gamma-ray bursts
… bursts (GRBs) are thought to originate from the core collapse of massive, rapidly rotating stars - events called "hypernovae." In this thesis, we improve upon a phenomenological model to determine [theta], the jet opening angle of GRBs. We assume that hypernova progenitors are massive stars in …
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Formation of the first galaxies under stellar feedback
… and mechanical and chemical feedback from a core-collapse or pair-instability supernova explosion, in shaping the gas in the interstellar medium out of which first galaxies were assembled. We find that the severity of the stellar feedback from the first generation of stars formed during the …
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