1,721,316 research outputs found
The evolution of close binaries with white dwarf components
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112934.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 07 oktober 2013Promotores : Nelemans, G.A., Groot, P.J.234 p
Searching for quiescent black holes
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565076.pdf (Publisher’s version ) (Open Access)Radboud University, 30 november 2017Promotor : Nelemans, G.A. Co-promotor : Jonker, P.G.vii, 202 p
Red supergiant counterparts of ULXs : paving the way to dynamical mass measurements
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147196.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 09 december 2015Promotor : Nelemans, G.A. Co-promotores : Jonker, P.G., Torres, M.A.P.143 p
Tales of the uncommon: Massive binary stars and gravitational-wave sources
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236411.pdf (Publisher’s version ) (Open Access)Radboud University, 28 september 2021Promotor : Nelemans, G.A. Co-promotores : Istrate, A., Pols, O.R.345 p
X-ray emissions from progenitors of type Ia Supernovae
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115725.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 15 november 2013Promotores : Nelemans, G.A., Dominik, C. Co-promotor : Voss, R.107 p
The synergy between gravitational wave and electromagnetic data of compact binaries
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134625.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 24 november 2014Promotor : Nelemans, G.A. Co-promotor : Sluijs, M. van der168 p
Backtracking the evolution of subdwarf B stars with asteroseismology
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75138.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 06 oktober 2009Promotor : Aerts, C.C. Co-promotor : Nelemans, G.A.121 p
White dwarf binaries and neutron star mergers in the stellar halo of the Milky Way in a cosmological context
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203076.pdf (Publisher’s version ) (Open Access)Radboud University, 17 april 2019Promotores : Nelemans, G.A., Helmi, A. Co-promotores : Starkenburg, E., Pols, O.R.iii, 158 p
The formation of black holes derived from X-ray binaries
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159165.pdf (Publisher’s version ) (Open Access)This Thesis revolves around the topic of black holes (BHs) in X-ray binaries (XRBs). The trigger of this work was to understand how stellar-mass BHs form, a question which we tackled both with theoretical as well as observational studies. The formation mechanism of BHs is an unsolved problem in high-energy astrophysics, in particular when it comes to the amount of mass ejected at formation and to how large is the velocity BHs acquire at birth (the so-called natal kick), if they acquire a velocity at all. One way of tackling these uncertainties is to perform physically-motivated simulations of the core-collapse supernova, which is computationally challenging. Another way is to study the birth and evolution of XRBs hosting a BH accreting from a stellar companion, which is the method we use in this Thesis. On the theoretical side, we combine an approach typical of binary population synthesis calculations with a more detailed approach which solves for the binary evolution of each source. When possible, we describe the different evolutionary paths of the binary via analytical calculations and time-scale arguments. On the observational side, we combine the techniques of optical spectroscopy and photometry, with the goal of increasing the sample of Galactic BHsRU Radboud Universiteit, 28 september 2016Promotor : Nelemans, G.A. Co-promotor : Jonker, P.G.IV, 173 p
On the Kinematics and Merger Locations of Binary Neutron Stars
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326059.pdf (Publisher’s version ) (Open Access)Binary neutron stars (BNSs) are rare, compact stellar remnants that provide critical insights into stellar evolution, supernova physics, and Galactic dynamics. Their kinematics –positions, velocities, and trajectories within the host galaxy– encode the outcomes of two supernovae and the binary interactions that preceded them. By analyzing these motions, we can inform stellar models, formation channels, and binary survival rates. BNSs are also key progenitors of gravitational-wave events and a prime location of nucleosynthesis. Understanding their merger locations improves merger rate predictions, spatial localisation for gravitational-wave and electromagnetic counterparts, and our understanding of cosmic chemical enrichment. As BNS datasets grow and gravitational-wave observations become increasingly available, a comprehensive understanding of BNS kinematics becomes essential for interpreting the observed populations. This thesis addresses that need by focusing on the motion and merger locations of BNSs within their host galaxies, delivering a general theoretical framework for the motion of kicked objects in the Galactic potential, a comprehensive kinematical characterisation of the observed BNS in the Milky Way, and a predictive framework that connects BNS kinematics to the observed merger locations in external galaxies.Radboud University, 01 december 2025Promotores : Levan, A.J., Nelemans, G.A. Co-promotor : Nissanke, S.M.v11, 219 p
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