REVIEW 12 cited by
A NICER View of PSR J1231$-$1411: A Complex Case
Not yet reviewed by Pith; the record is open.
This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.
SPECIMEN: schema-true, not a live event
T0 review · schema-true
One-sentence machine reading of the paper's core claim.
pith:XXXXXXXX · record.json · timestamp
abstract
Recent constraints on neutron star mass and radius have advanced our understanding of the equation of state (EOS) of cold dense matter. Some of them have been obtained by modeling the pulses of three millisecond X-ray pulsars observed by the Neutron Star Interior Composition Explorer (NICER). Here, we present a Bayesian parameter inference for a fourth pulsar, PSR J1231$-$1411, using the same technique with NICER and XMM-Newton data. When applying a broad mass-inclination prior from radio timing measurements and the emission region geometry model that can best explain the data, we find likely converged results only when using a limited radius prior. If limiting the radius to be consistent with the previous observational constraints and EOS analyses, we infer the radius to be $12.6 \pm 0.3$ km and the mass to be $1.04_{-0.03}^{+0.05}$ $M_\odot$, each reported as the posterior credible interval bounded by the $16\,\%$ and $84\,\%$ quantiles. If using an uninformative prior but limited between $10$ and $14$ km, we find otherwise similar results, but $R_{\mathrm{eq}} = 13.5_{-0.5}^{+0.3}$ km for the radius. In both cases, we find a nonantipodal hot region geometry where one emitting spot is at the equator or slightly above, surrounded by a large colder region, and where a noncircular hot region lies close to southern rotational pole. If using a wider radius prior, we only find solutions that fit the data significantly worse. We discuss the challenges in finding the better fitting solutions, possibly related to the weak interpulse feature in the pulse profile.
Forward citations
Cited by 12 Pith papers
-
Systematic study of the morphology and length of slow stable hybrid star branches
Systematic numerical survey classifies four types of slow stable hybrid star branches and shows slow conversion opens new viable parameter space for stiff hadronic models.
-
Magnetic Field Configurations in Binary Neutron Star Mergers II: Inspiral, Merger and Ejecta
Initial magnetic field topology, especially anti-aligned poloidal fields, strongly controls post-merger field amplification and ejecta magnetisation in neutron star merger simulations.
-
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...
-
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.
-
Can average speed of sound and thermodynamic response functions signal the exotic phases in neutron star cores?
Average speed of sound, its logarithmic derivative, and thermodynamic response functions distinguish sharp-interface versus mixed-phase hadron-quark transitions inside hybrid neutron stars.
-
Magnetic field dynamics in isolated neutron stars with an external dipole field
Long-term numerical relativity simulations find that neutron star magnetic fields relax to stable mixed configurations with toroidal energy fraction ≲10% within one Alfvén time after Tayler instability saturation.
-
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.
-
Low-frequency observations of low-mass binary systems with neutron star candidates
A 111 MHz archival search finds no periodic radio emission from five compact-object binaries and one ambiguous 13 Jy, 0.13 s burst toward J1527+3536.
-
Role of density profile of sub-GeV dark matter in the properties of dark matter admixed quark stars with Bayesian analysis of dark-NJL model
A model of quark stars with a variable dark matter density profile claims sub-GeV dark matter can satisfy all current compact star constraints.
-
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...
-
Compact stars in a large-tension braneworld: mildly negative Weyl coupling consistent with NICER and gravitational-wave data
A large-tension braneworld with α_U ≈ −0.15 fits NICER and GW170817 data for SLy, raising M_max to ~2.30 M_⊙ and R_1.4 to ~13.3 km relative to GR.
-
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.
Discussion (0). Sign in to comment.