Article
Astronomy & Astrophysics
Viktoria Frohlich, Zsolt Regaly, Jozsef Vinko
Summary: Investigated the formation of double neutron star (DNS) systems in binary systems with components above 8 solar masses. Found that fine-tuning of initial parameters is required for DNS formation via subsequent Type II supernova explosions. Our model can explain the formation of DNS systems with a separation greater than 2.95 au.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Katsuya T. Abe, Hiroyuki Tashiro
Summary: The study investigates the impact of population III stars supernova on high redshifts reionization history using Planck data. A new parameter xi is introduced to model the supernova contribution to reionization, showing consistency with observations and predictions from cosmological simulations. Further observations, such as high redshift QSO observations, can provide important information on the nature of population III stars.
Article
Astronomy & Astrophysics
L. Dessart, D. J. Hillier, T. Sukhbold, S. E. Woosley, H-T Janka
Summary: By conducting a set of 1D nonlocal thermodynamic equilibrium radiative transfer calculations, the study investigates the properties of nebular-phase Type Ibc supernovae. It is found that He stars synthesize less oxygen due to an enhanced mass loss rate, and the spectral properties of He stars with larger initial masses are similar to those of standard SNe Ibc.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
Cynthia R. Saad, Volker Bromm, Mounib El Eid
Summary: The study shows that magnetic fields play an important role in the formation of the first stars, delaying the collapse of gas and affecting the fragmentation and final mass of the stars. Further understanding of the formation and mass distribution of Population III stars requires considering the impact of magnetic fields.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Yaghoobi, F. Calura, J. Rosdahl, H. Haghi
Summary: Through simulations, it was found that in young globular clusters, larger masses led to quicker formation of second-generation stars, while lower density models formed more compact and He-rich SG stars, and high-density models had more extended and less He-enhanced SG stars. The study also revealed positive correlations between SG-to-total number ratio, maximum He enhancement in SG stars, and initial cluster mass.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Azton I. Wells, Michael L. Norman
Summary: The Phoenix Simulations depict the formation of first and second-generation star clusters in the universe. The study reveals that regions enriched with metals influence the formation of star clusters; and the metallicity of second-generation stars overlaps with subsequent Population II star formation, spanning a wide range of metallicity.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jade Powell, Bernhard Mueller, David R. Aguilera-Dena, Norbert Langer
Summary: This study conducts three-dimensional simulations of magnetorotational supernovae and finds that the explosion energy depends on the initial magnetic field strength. It also shows the formation of nonaxisymmetric, magnetically collimated jets, which are crucial for our understanding of other phenomena with high explosion energies. These simulations can be detected by the planned Cosmic Explorer detector.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Ondrej Jaura, Simon C. O. Glover, Katharina M. J. Wollenberg, Ralf S. Klessen, Sam Geen, Lionel Haemmerle
Summary: The ionizing radiation from massive Pop III stars is trapped in the surrounding accretion disc, thus having no significant impact on the number or total mass of protostars formed. The difference from previous studies lies in the way the radiation is injected into the simulation.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Lewis R. Prole, Paul C. Clark, Ralf S. Klessen, Simon C. O. Glover
Summary: This study presents simulations on the formation of primordial stars, revealing the relationship between sink particle creation density, number of sinks, and their mass. It also shows the impact of resolution on the initial mass function. The findings suggest that previous studies may have overestimated the masses of primordial stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Gen Chiaki, John H. Wise
Summary: The multiplicity of metal-free stars may affect their feedback efficiency and subsequent metal enrichment and galaxy formation. Radiative feedback from massive stars triggers nearby star formation in self-shielded clouds. This study compares two local approximations with direct integration of column density and finds that the density gradient approximation is accurate enough for larger volume galaxy simulations. The Jeans length approximation overestimates the column density and leads to enhanced self-shielded, star-forming clumps.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lewis R. Prole, Paul C. Clark, Ralf S. Klessen, Simon C. O. Glover, Ruediger Pakmor
Summary: The study suggests that the inclusion of magnetic fields in numerical simulations of Pop III star formation is largely unimportant, as the fields cannot suppress gas fragmentation and increased resolution.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Filippo Santoliquido, Michela Mapelli, Giuliano Iorio, Guglielmo Costa, Simon C. O. Glover, Tilman Hartwig, Ralf S. Klessen, Lorenzo Merli
Summary: Population III (Pop. III) binary stars are likely responsible for the first stellar-born binary black hole (BBH) mergers in the Universe. We examine the uncertainties in the merger rate density evolution and mass spectrum of Pop. III BBHs by considering different formation histories and initial orbital properties. The primary sources of uncertainty are the orbital properties and star formation history, which significantly affect the BBH merger rate and its characteristics. Overall, the typical masses of Pop. III BBHs are larger than those of BBHs from metal-rich stars.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Sahil Hegde, Steven R. Furlanetto
Summary: The formation of the first stars is a significant event in the universe's history, as these stars play a crucial role in the development of galaxies and the reionization process. A model analyzing the formation of these stars inside minihalos is constructed, taking into account factors such as the ultraviolet background, dark matter-baryon relative velocities, and X-ray background. The model reveals different key epochs for each process, with stream velocity dominating at high redshifts, the UV background setting the tone at intermediate times, and X-rays controlling the end of Pop III star formation at later times.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xingzhuo Chen, Lei Hu, Lifan Wang
Summary: By utilizing spatially resolved SN Ia host galaxy spectra from MUSE and MaNGA, along with a grouping algorithm and maximum likelihood method, the DTD of Type Ia supernovae progenitors was constrained, revealing a significant decay slope in SN rate when a power-law model was used. Testing other DTD models did not yield statistically significant support, indicating the dominance of the power-law model in describing the DTD of SNe Ia progenitors.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Ze-Pei Xing, Xiang-Dong Li
Summary: This study simulated NS XRBs associated with SNRs for different types of companions, estimating their birth rates and presenting the distributions of orbital parameters and companion mass for each type. The majority of companions were found to be Be X-ray binaries (BeXRBs), with a few expected to be associated with SNRs in a Milky Way-type galaxy.
ASTROPHYSICAL JOURNAL
(2021)