REVIEW 17 cited by
The Radius of the High-mass Pulsar PSR J0740+6620 with 3.6 yr of NICER Data
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
We report an updated analysis of the radius, mass, and heated surface regions of the massive pulsar PSR J0740+6620 using Neutron Star Interior Composition Explorer (NICER) data from 2018 September 21 to 2022 April 21, a substantial increase in data set size compared to previous analyses. Using a tight mass prior from radio timing measurements and jointly modeling the new NICER data with XMM-Newton data, the inferred equatorial radius and gravitational mass are $12.49_{-0.88}^{+1.28}$ km and $2.073_{-0.069}^{+0.069}$ $M_\odot$ respectively, each reported as the posterior credible interval bounded by the $16\,\%$ and $84\,\%$ quantiles, with an estimated systematic error $\lesssim 0.1$ km. This result was obtained using the best computationally feasible sampler settings providing a strong radius lower limit but a slightly more uncertain radius upper limit. The inferred radius interval is also close to the $R=12.76_{-1.02}^{+1.49}$ km obtained by Dittmann et al., when they require the radius to be less than $16$ km as we do. The results continue to disfavor very soft equations of state for dense matter, with $R<11.15$ km for this high-mass pulsar excluded at the $95\,\%$ probability. The results do not depend significantly on the assumed cross-calibration uncertainty between NICER and XMM-Newton. Using simulated data that resemble the actual observations, we also show that our pipeline is capable of recovering parameters for the inferred models reported in this paper.
Forward citations
Cited by 17 Pith papers
-
Holographic Soliton Crystals for Dense Nuclear Matter and Neutron Stars
A crystal of holographic baryons in the Witten-Sakai-Sugimoto model yields a nuclear-matter equation of state compatible with neutron-star observations.
-
Quarkyonic Stars with Strangeness
A three-flavor quarkyonic model with octet baryons yields stiffer neutron-star EOS and raises maximum masses, potentially resolving the hyperon puzzle.
-
NNStar: An end-to-end AI agent for nuclear matter and neutron star physics
NNStar packages the RMF-to-neutron-star pipeline as a portable LLM-agent skill, validated on TM1/NL3/FSU-δ6.7 and demonstrated by an autonomous σ6-extended TM1 fit.
-
Constraining Hamiltonians from chiral effective field theory with neutron-star data
Neutron-star data, run through fast emulators, directly constrain the six two-nucleon low-energy constants of an N2LO chiral Hamiltonian, with future detectors able to strongly pin down the 3P1 channel.
-
Systematics from NICER Pulse Profiles Drive Uncertainty in Multi-Messenger Inference of the Neutron Star Equation of State
A joint Bayesian analysis of NICER, gravitational wave, radio, and nuclear data shows that NICER pulse profile modeling choices dominate equation of state uncertainties and prefer the ST+PDT model over the PDT-U model...
-
Representing Equations of State With Strong First-Order Phase Transitions
Spectral Chebyshev representations of neutron-star equations of state with strong first-order phase transitions are generally somewhat more accurate than piecewise analytic representations with the same number of para...
-
A NICER view of the millisecond pulsar PSR J2124$-$3358: evidence for a helium atmosphere
X-PSI modeling of NICER/Chandra data for PSR J2124−3358 substantially prefers a helium atmosphere, giving M = 1.8 ± 0.5 M⊙ and Req = 11.7^{+2.6}_{-3.0} km with two slightly non-antipodal hot spots.
-
Determination of neutron star radius from pulse profile modeling using profile likelihood
Profile-likelihood maximization over nuisance parameters in X-PSI recovers injected neutron-star radius to <1σ on synthetic data, with precision comparable to MultiNest Bayesian inference but ~400× lower CPU cost.
-
Quarkyonic Quark-Meson Coupling Model for Nuclear and Neutron Matter
A quark-based nuclear matter model combining quarkyonic Pauli blocking with quark-meson coupling can be tuned to reproduce neutron-star and heavy-ion constraints.
-
Origin of nucleon mass in the light of PSR J0614-3329 with quark-hadron crossover
The parity doublet model combined with the new NICER radius measurement restricts the chiral invariant nucleon mass m0 to 800-860 MeV, implying it is at least 85% of the nucleon mass.
-
Quantifying the Information Gain from Future High-Precision Radius Measurements for Identifying Twin Neutron Stars
The paper claims a radius precision of ~0.2 km is enough to extract most Bayesian information for identifying twin neutron stars, but its own distinguishability and entropy analyses suggest notable gains remain down t...
-
Rapidly Spinning Massive Pulsars as an Indicator of Quark Deconfinement
Within a tuned hybrid equation of state, a color-superconducting quark core—absent from the hyperonic hadronic model—is needed to reach the mass and spin of PSR J0952–0607.
-
Effect of Dark matter and $\sigma$-cut potential on radial and non-radial oscillation modes in neutron stars
Dark matter-admixed neutron stars oscillate at higher f- and p1-mode frequencies than ordinary or σ-cut models, while quasi-universal oscillation relations still hold.
-
Understanding the Neutron Star Population with the SKAO Telescopes
SKAO AA* and AA4 surveys are projected to discover thousands of ordinary pulsars and ~800–1000 MSPs, enabling population synthesis, mass measurements and tests of gravity and emission physics.
-
Probing Neutron Star Interiors and the Properties of Cold Ultra-dense Matter with the SKAO
SKAO's sensitivity, surveys and sub-arraying will deliver tighter NS mass, MoI, spin, glitch and precession constraints that, with X-ray and GW data, probe cold ultra-dense matter.
-
Toward a Unified Understanding of the Dense Matter Equation of State
A review of three Bayesian/computational frameworks for combining heavy-ion and astrophysical constraints on the dense-matter equation of state, plus a proposed unified integration workflow.
-
The equation of state for neutron stars
A textbook-style review of the neutron-star equation of state covering the models, experimental and observational constraints, and open questions, with no new result claimed or derived.
Discussion (0). Sign in to comment.