The Radius of the Neutron Star PSR J0614-3329 from NICER Data
Abstract
Neutron star radius measurements, particularly using X-ray data collected with the Neutron star Interior Composition Explorer (NICER), have provided invaluable information for models of cold, catalyzed matter at densities above that of nuclear saturation. Here we present an analysis of NICER data on the 318-Hz pulsar PSR J0614-3329, which has a mass ~1.4-1.5 solar masses determined from radio observations. The best-fitting model we explore has three uniform-temperature circular hot spots and yields a symmetric 68% credible range for the equatorial circumferential radius of 9.88-12.77 km. We also explore joint fits to the NICER data and the X-ray Multi-Mirror (XMM-Newton) data on this pulsar, but find that the models that best fit both data sets systematically underpredict the XMM-Newton data when, as is standard, it is assumed that the XMM-Newton background is known from observations of surrounding fields. Finally, we discuss the implications of our results, combined with data on other neutron stars, for the properties of the dense matter in neutron star cores.
Related
- NICER constraints on low density matching and high density continuation in neutron star equations of state
- What We Have Learned from NICER About Neutron Star Radii
- Determination of neutron star radius from pulse profile modeling using profile likelihood
- Signatures of quark matter from neutron star mass-radius curve
- Equation of state and neutron star properties with new mass-radius constraints from PSR~J1614--2230, PSR~J2124--3358, and 47~Tuc~X7
BibTeX
@misc{miller2026radius,
title = {{The Radius of the Neutron Star PSR J0614-3329 from NICER Data}},
author = {M. C. Miller and A. J. Dittmann and I. M. Holt and F. K. Lamb and C. Chirenti and Z. Arzoumanian and J. Berteaud and S. Bogdanov and K. C. Gendreau and A. K. Harding and W. C. G. Ho and C. Kalapotharakos and S. M. Morsink and P. S. Ray and R. A. Remillard and Z. Wadiasingh and M. T. Wolff},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00965},
eprint = {2609.00965},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.00965},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - The Radius of the Neutron Star PSR J0614-3329 from NICER Data
AU - M. C. Miller
AU - A. J. Dittmann
AU - I. M. Holt
AU - F. K. Lamb
AU - C. Chirenti
AU - Z. Arzoumanian
AU - J. Berteaud
AU - S. Bogdanov
AU - K. C. Gendreau
AU - A. K. Harding
AU - W. C. G. Ho
AU - C. Kalapotharakos
AU - S. M. Morsink
AU - P. S. Ray
AU - R. A. Remillard
AU - Z. Wadiasingh
AU - M. T. Wolff
PY - 2026
DA - 2026/09/01
PB - arXiv
DO - 10.48550/arxiv.2609.00965
UR - https://arxiv.org/abs/2609.00965
AB - Neutron star radius measurements, particularly using X-ray data collected with the Neutron star Interior Composition Explorer (NICER), have provided invaluable information for models of cold, catalyzed matter at densities above that of nuclear saturation. Here we present an analysis of NICER data on the 318-Hz pulsar PSR J0614-3329, which has a mass ~1.4-1.5 solar masses determined from radio observations. The best-fitting model we explore has three uniform-temperature circular hot spots and yields a symmetric 68% credible range for the equatorial circumferential radius of 9.88-12.77 km. We also explore joint fits to the NICER data and the X-ray Multi-Mirror (XMM-Newton) data on this pulsar, but find that the models that best fit both data sets systematically underpredict the XMM-Newton data when, as is standard, it is assumed that the XMM-Newton background is known from observations of surrounding fields. Finally, we discuss the implications of our results, combined with data on other neutron stars, for the properties of the dense matter in neutron star cores.
ER -