Article
Astronomy & Astrophysics
Adrian S. Hamers, Giacomo Fragione, Patrick Neunteufel, Bence Kocsis
Summary: Detection of gravitational waves from mergers of neutron stars and black holes in the low- and high-end mass gap poses a puzzle to standard stellar and binary evolution theory. Research shows that most first-generation mergers are consistent with isolated binaries, while second-generation mergers are less common and can be strongly affected by three-body interactions.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Colom i Bernadich, V. Balakrishnan, E. Barr, M. Berezina, M. Burgay, S. Buchner, D. J. Champion, W. Chen, G. Desvignes, P. C. C. Freire, K. Grunthal, M. Kramer, Y. Men, P. V. Padmanabh, A. Parthasarathy, D. Pillay, I. Rammala, S. Sengupta, V. Venkatraman Krishnan
Summary: The study presents a follow-up investigation on a newly discovered pulsar in the Southern Hemisphere. By observing the system, the researchers determined its orbital parameters, mass, and constraints on its distance. The system's high eccentricity suggests a strong supernova kick during its formation. This finding is important for understanding the formation and evolution of neutron star merger events.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Irina Dvorkin, Frederic Daigne, Stephane Goriely, Elisabeth Vangioni, Joseph Silk
Summary: This study investigates the enrichment of the interstellar medium with r-process elements produced in binary neutron star mergers using a semi-analytic model. By simulating the dispersion of these elements in the ISM through a turbulent mixing scheme, the study shows that the observed abundances in Milky Way stars, especially the scatter at low metallicities, can be entirely explained by BNS mergers. The results suggest that BNS mergers could be the dominant source of r-process elements in the Galaxy.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
F. Gittins, N. Andersson, D. Jones
Summary: This study reviews research on the rotation and gravitational radiation of neutron stars, proposes a new scheme for modeling neutron star mountains, and finds that the largest quadrupoles are significantly lower than previous estimates.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. A. Morales, C. J. Horowitz
Summary: Non-axisymmetrical deformations of the crust on rapidly rotating neutron stars can generate continuous gravitational waves, with a maximum ellipticity of 7.4 x 10(-6).
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
A. Passamonti, N. Andersson, P. Pnigouras
Summary: This study focuses on the tidal response of a superfluid neutron star in a binary system and finds that superfluid physics has a negligible impact on static tidal deformation. The overwhelming contribution to the Love number is from the ordinary fundamental mode. Strong entrainment has a significant impact on superfluid modes, but the results for the dynamical tide are similar to the static limit.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
E. Giliberti, G. Cambiotti
Summary: So far, only transient gravitational waves produced by catastrophic events of extra-galactic origin have been detected. However, it is generally believed that there should also be continuous sources of gravitational waves within our Galaxy, such as accreting neutron stars, which could potentially be detected in the near future. This study investigates the physical picture of these sources and calculates the maximum ellipticity caused by starquakes, finding it to be in good agreement with observations and below the highest observed neutron star frequency.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Fabian Gittins, Nils Andersson
Summary: This paper discusses the upper limits on quadrupole deformations of rapidly spinning, deformed neutron stars and the size of mountains before the neutron star crust fractures. By considering a range of models obtained from chiral effective field theory, it is found that the derived mountains depend on the equation of state.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
J. Soldateschi, N. Bucciantini, L. Del Zanna
Summary: Scalar-tensor theories provide promising alternatives to general relativity, addressing long-standing issues in our understanding of gravity. The presence of spontaneous scalarisation can affect the magnetic deformation and emission of quadrupolar gravitational waves from neutron stars, with a universal scaling existing independently of magnetic field geometry and scalar-tensor theory parameters. Observability of deviations in gravitational wave strain from general relativity by current and future observatories is also discussed.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
R. Mochkovitch, F. Daigne, R. Duque, H. Zitouni
Summary: This study aims to predict the expected population of detectable kilonovae signals for the upcoming observing runs of the gravitational-wave network and discusses constraints from the non-detection of kilonova counterparts in follow-up actions, as well as potential source classes in future surveys.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Euaggelos E. Zotos, Hind Albalawi, Tobias C. Hinse, Konstantinos E. Papadakis, Jose L. Alvarellos
Summary: In this study, the planar circular restricted three-body problem was numerically investigated and applied to the Sun-Jupiter-particle problem. By combining qualitative mapping techniques with quantitative techniques, the study successfully traced a given trajectory in phase space and classified orbits in detail based on their dynamical character.
CHAOS SOLITONS & FRACTALS
(2021)
Article
Astronomy & Astrophysics
Laura Greggio, Paolo Simonetti, Francesca Matteucci
Summary: The merging rate of double neutron stars has significant impact on various astrophysical issues, with the delay time distribution of merging events being a key factor. Observational constraints from short GRB cosmic rate and chemical properties of Milky Way stars affect the shape of the delay time distribution for merging DNS systems. Matching these constraints requires around 1% of neutron star progenitors to end their evolution as merging DNS within a Hubble time.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Magdalena Sieniawska, David Ian Jones, Andrew L. Miller
Summary: Gravitational-wave astronomy allows us to study invisible objects and events. The improvement in sensitivities of interferometers will enable the detection of weaker signals, such as the emission of continuous gravitational waves. By applying the well-known parallax method, we can estimate the distance to gravitational-wave sources and explore potential errors. The study shows that detecting parallax in signals from spinning down sources can provide constraints on neutron star moment of inertia estimations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
J. M. Dong
Summary: This paper investigates the depletion effect of the Fermi surface and the quenched neutron triplet superfluidity on nuclear matter, exploring their impact on viscosity and core temperature of neutron stars. It was found that the core temperature of neutron stars in known low-mass X-ray binaries can be clearly divided into two groups, with some stars still being located in the unstable region. Additionally, the occurrence of the direct Urca process can reduce the inferred core temperature by about one order of magnitude, helping to alleviate the discrepancy between predictions and observations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Magdalena Sieniawska, David Ian Jones
Summary: This paper explores the measurement method of continuous gravitational wave emission from spinning neutron stars. It finds that the distance measurement is always degenerate with the moment of inertia. By constraining one of the parameters, it is possible to break the degeneracy and measure the remaining parameter.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Kunyang Li, Tamara Bogdanovic, David R. Ballantyne, Matteo Bonetti
Summary: This study evaluates the cosmological coalescence and detection rates for massive black hole binaries targeted by the gravitational wave observatory LISA. The results show that dynamical friction is the most important mechanism determining the coalescence rate, and most LISA detections originate from gas-rich galaxies with intermediate-mass black holes at specific redshifts. However, considering the effects of radiative feedback from accreting black holes significantly reduces the coalescence and detection rates.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Alberto Colombo, Om Sharan Salafia, Francesco Gabrielli, Giancarlo Ghirlanda, Bruno Giacomazzo, Albino Perego, Monica Colpi
Summary: This study presents realistic expectations for the number and properties of neutron star binary mergers to be detected in the upcoming fourth observing run of the LIGO-Virgo-KAGRA gravitational-wave detectors. The predictions are based on a population synthesis model, taking into account various factors such as the GW signal-to-noise ratio, kilonova light curves, relativistic jet gamma-ray burst emission, and afterglow light curves. The results show that a certain number of GW events can be confidently detected during the fourth observing run, with the majority producing a kilonova and a smaller fraction also producing a relativistic jet. However, the prospects for detecting relativistic jet emission are not promising.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Federica Sassano, Pedro R. Capelo, Lucio Mayer, Raffaella Schneider, Rosa Valiante
Summary: The study investigates the sustained accretion of gas-rich proto-galaxies onto black holes at super-Eddington rates. Results show that regardless of the sub-grid model used, accretion is rapidly quenched after around 1 million years, resulting in black holes reaching a maximum mass of about 10^4 times the mass of the Sun.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Multidisciplinary Sciences
Cecilia Chirenti, Simone Dichiara, Amy Lien, M. Coleman Miller, Robert Preece
Summary: Two signals that are consistent with numerical relativity predictions have been identified in the short bursts GRB 910711 and GRB 931101B, based on the analysis of archival BATSE data.
Article
Astronomy & Astrophysics
Eleonora Loffredo, Albino Perego, Domenico Logoteta, Marica Branchesi
Summary: This study investigates the impact of muons on the outcome of binary neutron star (BNS) merger simulations. The inclusion of muons is found to improve the accuracy of the simulations and has effects on the merger remnant and the trapped neutrino component.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Alessia Franchini, Matteo Bonetti, Alessandro Lupi, Giovanni Miniutti, Elisa Bortolas, Margherita Giustini, Massimo Dotti, Alberto Sesana, Riccardo Arcodia, Taeho Ryu
Summary: X-ray quasi-periodic eruptions (QPEs) are a new discovery associated with supermassive black holes, characterized by high-amplitude bursts recurring every few hours. A semi-analytical model based on an extreme mass-ratio inspiral (EMRI) system is proposed to explain the physical origin of QPEs. Synthetic X-ray light curves produced by the model accurately reproduce the diversity of QPE properties in different sources and account for the varying recurrence times and amplitudes. This model has implications for understanding the nature of the secondary object and the larger EMRI population.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Gokul P. Srinivasaragavan, Brendan O'Connor, S. Bradley Cenko, Alexander J. Dittmann, Sheng Yang, Jesper Sollerman, G. C. Anupama, Sudhanshu Barway, Varun Bhalerao, Harsh Kumar, Vishwajeet Swain, Erica Hammerstein, Isiah Holt, Shreya Anand, Igor Andreoni, Michael W. Coughlin, Simone Dichiara, Avishay Gal-Yam, M. Coleman Miller, Jaime Soon, Roberto Soria, Joseph Durbak, James H. Gillanders, Sibasish Laha, Anna M. Moore, Fabio Ragosta, Eleonora Troja
Summary: We observed the optical counterpart of the long gamma-ray burst GRB 221009A, which is both nearby and highly energetic, providing a unique opportunity to explore the connection between massive star core collapse and relativistic jet formation. Our analysis suggests the presence of an associated supernova, SN 2022xiw, which is fainter than SN 1998bw. We find properties consistent with previous GRB-associated SNe but note that the SN parameters are weakly constrained.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Article
Astronomy & Astrophysics
Alexander J. Dittmann, Geoffrey Ryan, M. Coleman Miller
Summary: We have investigated accreting supermassive black hole binaries as they inspiral due to gravitational radiation to understand decoupling of binaries from disks and inform future observations. Our numerical studies accurately capture the decoupling point and gas flow during the inspiral. We demonstrate that timescale-based predictions overestimate decoupling and illustrate a more accurate velocity-based criterion.
ASTROPHYSICAL JOURNAL LETTERS
(2023)
Review
Physics, Particles & Fields
Pau Amaro-Seoane, Jeff Andrews, Manuel Arca Sedda, Abbas. Askar, Quentin Baghi, Razvan Balasov, Imre Bartos, Simone S. Bavera, Jillian Bellovary, Christopher P. L. Berry, Emanuele Berti, Stefano Bianchi, Laura Blecha, Stephane Blondin, Tamara Bogdanovic, Samuel Boissier, Matteo Bonetti, Silvia Bonoli, Elisa Bortolas, Katelyn Breivik, Pedro R. Capelo, Laurentiu Caramete, Federico Cattorini, Maria Charisi, Sylvain Chaty, Xian Chen, Martyna Chruslinska, Alvin J. K. Chua, Ross Church, Monica Colpi, Daniel D'Orazio, Camilla Danielski, Melvyn B. Davies, Pratika Dayal, Alessandra De Rosa, Andrea Derdzinski, Kyriakos Destounis, Massimo Dotti, Ioana Dutan, Irina Dvorkin, Gaia Fabj, Thierry Foglizzo, Saavik Ford, Jean-Baptiste Fouvry, Alessia Franchini, Tassos Fragos, Chris Fryer, Massimo Gaspari, Davide Gerosa, Luca Graziani, Paul Groot, Melanie Habouzit, Daryl Haggard, Zoltan Haiman, Wen-Biao Han, Alina Istrate, Peter H. Johansson, Fazeel Mahmood Khan, Tomas Kimpson, Kostas Kokkotas, Albert Kong, Valeriya Korol, Kyle Kremer, Thomas Kupfer, Astrid Lamberts, Shane Larson, Mike Lau, Dongliang Liu, Nicole Lloyd-Ronning, Giuseppe Lodato, Alessandro Lupi, Chung-Pei Ma, Tomas Maccarone, Ilya Mandel, Alberto Mangiagli, Michela Mapelli, Stephane Mathis, Lucio Mayer, Sean McGee, Berry McKernan, M. Coleman Miller, David F. Mota, Matthew Mumpower, Syeda S. Nasim, Gijs Nelemans, Scott Noble, Fabio Pacucci, Francesca Panessa, Vasileios Paschalidis, Hugo Pfister, Delphine Porquet, John Quenby, Angelo Ricarte, Friedrich K. Roepke, John Regan, Stephan Rosswog, Ashley Ruiter, Milton Ruiz, Jessie Runnoe, Raffaella Schneider, Jeremy Schnittman, Amy Secunda, Alberto Sesana, Naoki Seto, Lijing Shao, Stuart Shapiro, Carlos Sopuerta, Nicholas C. Stone, Arthur Suvorov, Nicola Tamanini, Tomas Tamfal, Thomas Tauris, Karel Temmink, John Tomsick, Silvia Toonen, Alejandro Torres-Orjuela, Martina Toscani, Antonios Tsokaros, Caner Unal, Veronica Vazquez-Aceves, Rosa Valiante, Maurice van Putten, Jan van Roestel, Christian Vignali, Marta Volonteri, Kinwah Wu, Ziri Younsi, Shenghua Yu, Silvia Zane, Lorenz Zwick, Fabio Antonini, Vishal Baibhav, Enrico Barausse, Alexander Bonilla Rivera, Marica Branchesi, Graziella Branduardi-Raymont, Kevin Burdge, Srija Chakraborty, Jorge Cuadra, Kristen Dage, Benjamin Davis, Selma E. de Mink, Roberto Decarli, Daniela Doneva, Stephanie Escoffier, Poshak Gandhi, Francesco Haardt, Carlos O. Lousto, Samaya Nissanke, Jason Nordhaus, Richard O'Shaughnessy, Simon Portegies Zwart, Adam Pound, Fabian Schussler, Olga Sergijenko, Alessandro Spallicci, Daniele Vernieri, Alejandro Vigna-Gomez
Summary: The Laser Interferometer Space Antenna (LISA) is an innovative experiment for gravitational wave astronomy, offering unique opportunities to address key astrophysical questions in a novel way. By synergizing with ground-based and space-born instruments, LISA enables multi-messenger observations, enhancing its discovery potential. This review highlights the extensive landscape of astrophysical theory, numerical simulations, and astronomical observations necessary for modeling and interpreting LISA's upcoming datastream. It also discusses open issues, gaps in understanding, and potential research avenues that LISA can contribute to in combination with electromagnetic domain studies.
LIVING REVIEWS IN RELATIVITY
(2023)
Article
Astronomy & Astrophysics
Floor van Donkelaar, Lucio Mayer, Pedro R. Capelo, Tomas Tamfal, Thomas R. Quinn, Piero Madau
Summary: In this study, the formation history and properties of proto-globular cluster candidates in the region surrounding a Milky Way-sized galaxy were investigated using the 'GigaEris' simulation. Nine systems that satisfy the criteria were identified, with all but one appearing to be associated with gas filaments accreting onto the main galaxy. The oldest object seems to be a stripped compact dwarf galaxy that has lost its entire dark matter content.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lorenz Zwick, Pedro R. Capelo, Lucio Mayer
Summary: In preparation for future space-borne gravitational-wave detectors, a systematic comparison was performed to determine whether the modelling effort should focus on high-precision vacuum templates or on the astrophysical environment of the sources. The results suggest that environmental effects should be prioritized in waveform models to maximize the science yield of future detectors, particularly for binaries lighter than 10^7/(1 + z)^2 solar masses and high-SNR sources at low redshift.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Pablo M. Galan-de Anta, Pedro R. Capelo, Eugene Vasiliev, Massimo Dotto, Marc Sarzi, Enrico Maria Corsini, Lorenzo Morelli
Summary: By studying the age of stellar populations in galactic discs, we can learn about the assembly history of galaxies and place constraints on their merger events. In this study, the fragility of thin galactic discs and nuclear stellar discs (NSDs) in intermediate-mass-ratio dry encounters was explored using a N-body model. The results show that thin galactic discs are more affected by mergers, while NSDs exhibit resilience.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
L. Piro, M. Colpi, J. Aird, A. Mangiagli, A. C. Fabian, M. Guainazzi, S. Marsat, A. Sesana, P. McNamara, M. Bonetti, E. M. Rossi, N. R. Tanvir, J. G. Baker, G. Belanger, T. Dal Canton, O. Jennrich, M. L. Katz, N. Luetzgendorf
Summary: The European Space Agency is studying two large-class missions in the 2030s to investigate energetic and violent phenomena in the Universe. The Athena mission aims to study baryons in large-scale structures and accreting supermassive black holes, while LISA mission extends the hunt for gravitational wave events. The concurrent operation of these missions can enable unique experiments in astrophysics and cosmography.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)