A new redshift-correlation technique with third-generation GW detectors can constrain the BNS contribution to cosmic r-process nucleosynthesis to 5-6% precision via Fisher forecasts on mock bright- and dark-siren data.
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@doi [ ] 10.1038/340126a0, https://ui.adsabs.harvard.edu/abs/1989Natur.340..126E 340
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Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
Anisotropic low-energy electron pitch angles reduce synchrotron polarization degrees in gamma-ray and X-ray bands of GRB prompt emission compared to isotropic cases, with optical band behavior depending on the slope m, offering a possible match to some observations.
Pair production via radiative magnetic reconnection near spinning black holes supplies non-uniform plasma to jets at levels sufficient to explain M87 radio emission.
Numerical relativity simulations of hierarchical mergers in collapsar-disk geometry show eccentricity building to 0.6 and partially surviving (up to 0.1) to merger, offering a gravitational-wave signature for this formation scenario.
Non-LTE models for He and Sr in kilonova ejecta show that ~1% He or 1-10% Sr can reproduce the 1μm absorption feature in AT2017gfo, implying low-Ye, low-entropy r-process conditions.
A dynamical model of magnetar-driven jet and PWN emission predicts a sequence of thermal, X-ray plateau, and late synchrotron/inverse-Compton radiation that accounts for key features in merger GRBs.
Observational analysis of EMP stars including a new r-process enhanced star G256353 whose heavy-element pattern matches scaled solar and neutron-star-merger predictions, supporting r-process universality.
The Argus Array and DSA are projected to detect 47 and 82 long GRB afterglows per year respectively from Fermi triggers, along with over 100 independent detections annually and some short GRB counterparts.
Stellar evolution and atmosphere models predict black hole progenitors are predominantly hot and blue with a direct-collapse rate of ~0.4 per century in a 1 Msun/yr star-forming galaxy.
Non-detection of kilonova from S250206dm excludes AT 2017gfo-like events and disfavors NS-BH mergers with mass ratio Q >= 3.2, reaching GW-comparable precision on the mass gap candidate.
More complete lanthanide line data in radiative transfer modeling requires a lanthanide mass fraction of only 2.5e-3 to match the observed spectrum of AT 2017gfo, twenty times below prior claims.
Simulations of the BSD instrument for POLAR-2 show it can localize faint GRBs like GRB 170817A to about 1.5 degrees accuracy, meeting requirements for supporting GRB polarimetry.
Short and long-short GRB rates of 195-666 Gpc^{-3} yr^{-1} exceed the 66-347 Gpc^{-3} yr^{-1} EM-bright NS merger rate from GW observations, challenging a pure NS merger origin.
Latest GW neutron star merger rates are consistent with short GRBs being produced by BNS mergers if jets are wide or rates low, with NSBH mergers subdominant.
No coincident GW signals found with long GRBs in O3 run; luminosity distance limits set assuming binary merger powering.
A Python pipeline for robotic GRB optical followup with LCO that responds within 3 minutes and was demonstrated on GRB180720B.
Identifies eight Fermi-GBM sGRBs similar to 170817A via hardness-ratio K-means clustering and estimates ~5 GW+sGRB events by end of O4.
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Inferring the role of binary neutron star mergers in r-process nucleosynthesis with multi-messenger observations using Cosmic Explorer and Einstein Telescope
A new redshift-correlation technique with third-generation GW detectors can constrain the BNS contribution to cosmic r-process nucleosynthesis to 5-6% precision via Fisher forecasts on mock bright- and dark-siren data.
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Moving-mesh simulations of spreading dynamics and local electron cooling in structured gamma-ray burst afterglow jets
Structured GRB jet simulations find that local electron cooling shifts the synchrotron cooling break up by over a factor of ten, smooths the transition, produces steeper post-break slopes initially, and originates from a narrow frequency-dependent region behind the shock front.
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Synchrotron polarization of anisotropic electron distribution in GRB prompt emission
Anisotropic low-energy electron pitch angles reduce synchrotron polarization degrees in gamma-ray and X-ray bands of GRB prompt emission compared to isotropic cases, with optical band behavior depending on the slope m, offering a possible match to some observations.
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Non-uniform particle injection into black hole jets by radiative magnetic reconnection
Pair production via radiative magnetic reconnection near spinning black holes supplies non-uniform plasma to jets at levels sufficient to explain M87 radio emission.
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Eccentricity as a signature of hierarchical subsolar-mass mergers in collapsar disks
Numerical relativity simulations of hierarchical mergers in collapsar-disk geometry show eccentricity building to 0.6 and partially surviving (up to 0.1) to merger, offering a gravitational-wave signature for this formation scenario.
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Non-LTE Ionization Modeling for Helium and Strontium in Neutron Star Merger Ejecta
Non-LTE models for He and Sr in kilonova ejecta show that ~1% He or 1-10% Sr can reproduce the 1μm absorption feature in AT2017gfo, implying low-Ye, low-entropy r-process conditions.
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Multi-wavelength Emission for a Post-merger Magnetar: The Magnetar-Driven Poynting Jet and Its Associated Pulsar Wind Nebula
A dynamical model of magnetar-driven jet and PWN emission predicts a sequence of thermal, X-ray plateau, and late synchrotron/inverse-Compton radiation that accounts for key features in merger GRBs.
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The \emph{R}-process Alliance: A Bright, Strongly \emph{R}-process-enhanced Extremely Metal-poor Star Observed with GHOST
Observational analysis of EMP stars including a new r-process enhanced star G256353 whose heavy-element pattern matches scaled solar and neutron-star-merger predictions, supporting r-process universality.
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Prospects for GRB Afterglow Discovery with the Eric and Wendy Schmidt Observatory System
The Argus Array and DSA are projected to detect 47 and 82 long GRB afterglows per year respectively from Fermi triggers, along with over 100 independent detections annually and some short GRB counterparts.
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Hot blue progenitors of stellar-mass black holes
Stellar evolution and atmosphere models predict black hole progenitors are predominantly hot and blue with a direct-collapse rate of ~0.4 per century in a 1 Msun/yr star-forming galaxy.
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Illuminating the Mass Gap Through Deep Optical Constraint on a Neutron Star Merger Candidate S250206dm
Non-detection of kilonova from S250206dm excludes AT 2017gfo-like events and disfavors NS-BH mergers with mass ratio Q >= 3.2, reaching GW-comparable precision on the mass gap candidate.
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Improved lanthanide constraints for the kilonova AT 2017gfo
More complete lanthanide line data in radiative transfer modeling requires a lanthanide mass fraction of only 2.5e-3 to match the observed spectrum of AT 2017gfo, twenty times below prior claims.
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Design and preliminary performance study of the broad-band spectrometer detector for POLAR-2
Simulations of the BSD instrument for POLAR-2 show it can localize faint GRBs like GRB 170817A to about 1.5 degrees accuracy, meeting requirements for supporting GRB polarimetry.
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Neutron Star Merger Rates from Multi-messenger Observations: Clues to the Physical Origin of the Short and Long-short Gamma-ray Bursts
Short and long-short GRB rates of 195-666 Gpc^{-3} yr^{-1} exceed the 66-347 Gpc^{-3} yr^{-1} EM-bright NS merger rate from GW observations, challenging a pure NS merger origin.
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Wide Jets or Low Rates: Reconciling Short GRB and Gravitational-Wave Neutron Star Merger Rates
Latest GW neutron star merger rates are consistent with short GRBs being produced by BNS mergers if jets are wide or rates low, with NSBH mergers subdominant.
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Searching for gravitational waves from compact binary mergers powering long gamma-ray bursts during LIGO-Virgo-KAGRA's O3 run
No coincident GW signals found with long GRBs in O3 run; luminosity distance limits set assuming binary merger powering.
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A robotic pipeline for fast GRB followup with the Las Cumbres observatory network
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Similar Fermi-GBM sGRBs to GW/sGRB 170817A in MeV-GeV energies
Identifies eight Fermi-GBM sGRBs similar to 170817A via hardness-ratio K-means clustering and estimates ~5 GW+sGRB events by end of O4.