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Neutron Star Mass across Binary Pulsar Subpopulations: Mass-Spin Correlation, Mass Distributions, and Moment of Inertia Effects
Debatri Chattopadhyay
We present a hierarchical Bayesian analysis of the joint mass, spin, and orbital properties of Galactic binary radio pulsars with measured neutron star masses, classified…
Transitions in the Mass-ratio and Spin Properties of Binary Black Holes in GWTC-5
Elizabeth Flanagan, Fabio Antonini, Thomas Callister +4
We analyze the mass-ratio and effective-spin () distributions of binary black hole mergers in the latest gravitational-wave catalog, GWTC-5, as a function of primary m…
Repopulating the pair-instability mass gap without sustained growth to massive IMBHs: the case of 47\,Tuc
Debatri Chattopadhyay, Daniel Marín Pina, Mark Gieles +2
We model the formation and retention of the most massive black hole (BH) in 47~Tuc using the semi-analytical code \texttt{cBHBd}, coupling cluster evolution with binary BH dynamics…
Modelling Millisecond Pulsar Populations in Globular Clusters with NBODY6++GPU
Yuzhe Song, Debatri Chattopadhyay, Jarrod Hurley +3
Millisecond pulsars (MSPs) are neutron stars with spin periods as short as a few milliseconds, formed through mass accretion from companion stars. In the dense environments of glob…
Gravitational-wave constraints on the pair-instability mass gap and nuclear burning in massive stars
Fabio Antonini, Isobel Romero-Shaw, Thomas Callister +5
Pair-instability should prevent the direct formation of black holes above about creating a pair-instability mass gap. Yet gravitational-wave observations have detected…
Inferring the pair-instability mass gap from gravitational wave data
Fabio Antonini, Thomas Callister, Fani Dosopoulou +2
We use hierarchical Bayesian inference with non-parametric Gaussian process models to investigate the effective inspiral spin parameter, , as a function of primary bla…
Possible binary neutron star merger history of the primary of GW230529
Parthapratim Mahapatra, Debatri Chattopadhyay, Anuradha Gupta +4
Black holes (BHs) with masses between , produced by a binary neutron star (BNS) merger, can further pair up with a neutron star or BH and merge again within a Hu…
The Impact of Astrophysical Priors on Parameter Inference for GW230529
Debatri Chattopadhyay, Sama Al-Shammari, Fabio Antonini +3
We investigate the effects of prior selection on the inferred mass and spin parameters of the neutron star-black hole merger GW230529\_181500. Specifically, we explore models motiv…
Binary population synthesis of the Galactic canonical pulsar population
Yuzhe Song, Simon Stevenson, Debatri Chattopadhyay +2
Pulsars are rapidly rotating neutron stars that emit radiation across the electromagnetic spectrum, from radio to gamma-rays. We use the rapid binary population synthesis suite COM…
Reconstructing the Genealogy of LIGO-Virgo Black Holes
Parthapratim Mahapatra, Debatri Chattopadhyay, Anuradha Gupta +4
We propose a Bayesian inference framework to predict the merger history of LIGO-Virgo binary black holes (BHs), whose binary components may have undergone hierarchical mergers in t…
Everything everywhere all at once: A detailed study of GW230529
Koustav Chandra, Ish Gupta, Rossella Gamba +5
This study investigates the origins of GW230529, delving into its formation from massive stars within isolated binary systems. Utilizing population synthesis models, we present com…
Observation of Gravitational Waves from the Coalescence of a Compact Object and a Neutron Star
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1793
We report the observation of a coalescing compact binary with component masses and (all measurements quoted at the 90% credible le…
Double black hole mergers in nuclear star clusters: eccentricities, spins, masses, and the growth of massive seeds
Debatri Chattopadhyay, Jakob Stegmann, Fabio Antonini +2
We investigate the formation of intermediate mass black holes (IMBHs) through hierarchical mergers of stellar origin black holes (BHs), as well as BH mergers formed dynamically in…
Binary neutron star populations in the Milky Way
Cecilia Sgalletta, Giuliano Iorio, Michela Mapelli +7
Galactic binary neutron stars (BNSs) are a unique laboratory to probe the evolution of BNSs and their progenitors. Here, we use a new version of the population synthesis code SEVN…
Predictions of a simple parametric model of hierarchical black hole mergers
Parthapratim Mahapatra, Debatri Chattopadhyay, Anuradha Gupta +3
Hierarchical mergers of black holes are proposed as a mechanism to explain the observations of binary black holes with component masses between $\sim 50M_{\odot}\hbox{--}130M_{\odo…
Coalescing black hole binaries from globular clusters: mass distributions and comparison to gravitational wave data from GWTC-3
Fabio Antonini, Mark Gieles, Fani Dosopoulou +1
We use our cluster population model, cBHBd, to explore the mass distribution of merging black hole binaries formed dynamically in globular clusters. We include in our models the ef…
Black hole - black hole total merger mass and the origin of LIGO/Virgo sources
K. Belczynski, Z. Doctor, M. Zevin +3
The LIGO-Virgo-KAGRA (LVK) Collaboration has reported nearly 100 BH-BH mergers. The LVK provides estimates of rates, masses, effective spins, and redshifts for these mergers. Yet,…
Modelling the formation of the first two neutron star-black hole mergers, GW200105 and GW200115: metallicity, chirp masses and merger remnant spins
Debatri Chattopadhyay, Simon Stevenson, Floor Broekgaarden +2
The two neutron star-black hole mergers (GW200105 and GW200115) observed in gravitational waves by advanced LIGO and Virgo, mark the first ever discovery of such binaries in nature…
Linking the rates of neutron star binaries and short gamma-ray bursts
Nikhil Sarin, Paul D. Lasky, Francisco H. Vivanco +4
Short gamma-ray bursts are believed to be produced by both binary neutron star (BNS) and neutron star-black hole (NSBH) mergers. We use current estimates for the BNS and NSBH merge…
Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave Observations II: Double Compact Object Rates and Properties
Floor S. Broekgaarden, Edo Berger, Simon Stevenson +9
Making the most of the rapidly increasing population of gravitational-wave detections of black hole (BH) and neutron star (NS) mergers requires comparing observations with populati…
The Uncertain Future of Massive Binaries Obscures the Origin of LIGO/Virgo Sources
K. Belczynski, A. Romagnolo, A. Olejak +6
The LIGO/Virgo gravitational--wave observatories have detected 50 BH-BH coalescences. This sample is large enough to have allowed several recent studies to draw conclusions about t…
Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave Observations I: Black Hole-Neutron Star Mergers
Floor S. Broekgaarden, Edo Berger, Coenraad J. Neijssel +7
Mergers of black hole-neutron star (BHNS) binaries have now been observed by GW detectors with the recent announcement of GW200105 and GW200115. Such observations not only provide…
Modelling Neutron Star-Black Hole Binaries: Future Pulsar Surveys and Gravitational Wave Detectors
Debatri Chattopadhyay, Simon Stevenson, Jarrod R. Hurley +2
Binaries comprised of a neutron star (NS) and a black hole (BH) have so far eluded observations as pulsars and with gravitational waves (GWs). We model the formation and evolution…
Population Properties of Compact Objects from the Second LIGO-Virgo Gravitational-Wave Transient Catalog
The LIGO Scientific Collaboration, the Virgo Collaboration, R. Abbott +1338
We report on the population of the 47 compact binary mergers detected with a false-alarm rate 1/yr in the second LIGO--Virgo Gravitational-Wave Transient Catalog, GWTC-2. We observ…