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How Common Are Common Envelopes? Quantifying Their Role in Forming Gravitational-Wave Sources
Floor S. Broekgaarden, Ana Lam, Sasha Levina +14
A central goal of gravitational-wave astronomy is to use merging binary black hole (BBH), black hole-neutron star (BHNS), and binary neutron star (BNS) systems as fossils to recons…
Lower Your Rates: On Claims of a Binary Black Hole Merger-Rate Crisis
Floor S. Broekgaarden
Recent studies have argued that isolated binary evolution simulations generically overestimate the observed local binary black hole (BBH) merger rate, even after adopting observati…
Massquerade: Impacts of Mass Ratio Reversals on Binary Black Hole Merger Rates and Mass Distributions
Tyler B. Smith, Floor Broekgaarden, Sasha Levina +4
We investigate the role of mass ratio reversal (MRR), in which the initially less massive star in a binary forms the more massive compact object, in shaping the astrophysical binar…
From cosmological simulations to binary black hole mergers: The impact of using analytical star formation history models on gravitational-wave source populations
Sasha Levina, Floor Broekgaarden, Lieke van Son +4
Observations of binary black hole (BBH) mergers provide a unique window into the lives of massive stars across cosmic time. Connecting redshift-dependent merger properties to massi…
Multidisciplinary Science in the Multimessenger Era
Eric Burns, Christopher L. Fryer, Ivan Agullo +82
Astrophysical observations of the cosmos allow us to probe extreme physics and answer foundational questions on our universe. Modern astronomy is increasingly operating under a hol…
Multi-messenger observations in the Einstein Telescope era: binary neutron star and black hole - neutron star mergers
Alberto Colombo, Om Sharan Salafia, Giancarlo Ghirlanda +6
The Einstein Telescope (ET), a proposed next-generation gravitational wave (GW) observatory, will expand the reach of GW astronomy of stellar-mass compact object binaries to unprec…
Not just winds: why models find binary black hole formation is metallicity dependent, while binary neutron star formation is not
L. A. C. van Son, S. K. Roy, I. Mandel +6
Both detailed and rapid population studies alike predict that binary black hole (BHBH) formation is orders of magnitude more efficient at low metallicity than high metallicity, whi…
Investigating the Cosmological Rate of Compact Object Mergers from Isolated Massive Binary Stars
Adam Boesky, Floor S. Broekgaarden, Edo Berger
Gravitational wave detectors are observing compact object mergers from increasingly far distances, revealing the redshift evolution of the binary black hole (BBH) -- and soon the b…
The Binary Black Hole Merger Rate Deviates From the Cosmic Star Formation Rate: A Tug of War Between Metallicity and Delay Times
Adam Boesky, Floor S. Broekgaarden, Edo Berger
Gravitational-wave detectors are now making it possible to investigate how the merger rate of binary black holes (BBHs) evolves with redshift. In this study, we examine whether the…
Beyond the far side: Observing black hole mergers beyond the pair-instability mass gap with next-generation gravitational wave detectors
Gabriele Franciolini, Konstantinos Kritos, Luca Reali +2
Stellar evolution predicts the existence of a mass gap for black hole remnants produced by pair-instability supernova dynamics, whose lower and upper edges are very uncertain. We s…
Multi-messenger prospects for black hole - neutron star mergers in the O4 and O5 runs
Alberto Colombo, Raphaël Duqué, Om Sharan Salafia +13
The existence of merging black hole-neutron star (BHNS) binaries has been ascertained through the observation of their gravitational wave (GW) signals. However, to date, no definit…
Gamma-ray Transient Network Science Analysis Group Report
Eric Burns, Michael Coughlin, Kendall Ackley +34
The Interplanetary Network (IPN) is a detection, localization and alert system that utilizes the arrival time of transient signals in gamma-ray detectors on spacecraft separated by…
Roman CCS White Paper: Characterizing Superluminous Supernovae with Roman
Sebastian Gomez, Kate Alexander, Edo Berger +16
Type-I Superluminous Supernovae (SLSNe) are an exotic class of core-collapse SN (CCSN) that can be up to 100 times brighter and more slowly-evolving than normal CCSNe. SLSNe repres…
Visualizing the Number of Existing and Future Gravitational-Wave Detections from Merging Double Compact Objects
Floor S. Broekgaarden, Sharan Banagiri, Ethan Payne
How many gravitational-wave observations from double compact object mergers have we seen to date? This seemingly simple question surprisingly yields a somewhat ambiguous answer tha…
Wide binary pulsars from electron-capture supernovae
Simon Stevenson, Reinhold Willcox, Alejandro Vigna-Gomez +1
Neutron stars receive velocity kicks at birth in supernovae. Those formed in electron-capture supernovae from super asymptotic giant branch stars -- the lowest mass stars to end th…
Signatures of mass ratio reversal in gravitational waves from merging binary black holes
Floor S. Broekgaarden, Simon Stevenson, Eric Thrane
The spins of merging binary black holes offer insights into their formation history. Recently it has been argued that in isolated binary evolution of two massive stars the firstbor…
Which black hole formed first? Mass-ratio reversal in massive binary stars from gravitational-wave data
Matthew Mould, Davide Gerosa, Floor S. Broekgaarden +1
Population inference of gravitational-wave catalogues is a useful tool to translate observations of black-hole mergers into constraints on compact-binary formation. Different forma…
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…
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…
Gravitational wave sources in our Galactic backyard: Predictions for BHBH, BHNS and NSNS binaries detectable with LISA
Tom Wagg, Floor S. Broekgaarden, Selma E. de Mink +3
Future searches for gravitational waves from space will be sensitive to double compact objects (DCOs) in our Milky Way. We present new simulations of the populations of double blac…
The redshift evolution of the binary black hole merger rate: a weighty matter
L. A. C. van Son, S. E. de Mink, T. Callister +7
Gravitational wave detectors are starting to reveal the redshift evolution of the binary black hole (BBH) merger rate, . We make predictions for $R_{\mathrm{BB…
Formation of the First Two Black Hole-Neutron Star Mergers (GW200115 and GW200105) from Isolated Binary Evolution
Floor S. Broekgaarden, Edo Berger
In this work we study the formation of the first two black hole-neutron star (BHNS) mergers detected in gravitational waves (GW200115 and GW200105) from massive stars in wide isola…
Rates of Compact Object Coalescences
Ilya Mandel, Floor S. Broekgaarden
Gravitational-wave detections are enabling measurements of the rate of coalescences of binaries composed of two compact objects -- neutron stars and/or black holes. The coalescence…
Evidence for X-ray Emission in Excess to the Jet Afterglow Decay 3.5 yrs After the Binary Neutron Star Merger GW 170817: A New Emission Component
A. Hajela, R. Margutti, J. S. Bright +34
For the first years after the binary neutron star merger event GW 170817 the radio and X-ray radiation has been dominated by emission from a structured relativistic off-axi…