Equation of state and neutron star properties with new mass-radius constraints from PSR~J1614--2230, PSR~J2124--3358, and 47~Tuc~X7
Abstract
We study the impact of new mass-radius information from PSR J1614-2230, PSR J2124-3358, and 47 Tuc X7 in a combined equation of state inference based on chiral effective field theory constraints at nuclear densities and using different high-density extensions, including perturbative QCD constraints. The largest impact stems from the heavy-mass PSR J1614-2230 star, which shifts heavy neutron stars to smaller radii by around 0.4 km. Moreover, the combined astrophysical NICER, LIGO/Virgo, and X-ray information drives the radius posterior to a more data-driven distribution, which is less sensitive to the high-density extension. For the equation of state, the new mass-radius information significantly tightens the pressure and speed-of-sound posterior distributions, especially around three times saturation density. Finally, we make predictions for the poorly constrained masses of PSR J2124-3358 and 47 Tuc X7 based on the combined equation of state analysis and the other astrophysical sources.
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BibTeX
@misc{mendes2026equation,
title = {{Equation of state and neutron star properties with new mass-radius constraints from PSR~J1614--2230, PSR~J2124--3358, and 47~Tuc~X7}},
author = {Melissa Mendes and Isak Svensson and Hannah Gottling and Kai Hebeler and Achim Schwenk and Nathan Rutherford and Lucien Mauviard and Christine Kazantsev and Yves Kini and Denis Gonzalez-Caniulef and Sebastien Guillot and Anna Watts},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.00173},
eprint = {2609.00173},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05758429v1},
}
RIS
TY - UNPB
TI - Equation of state and neutron star properties with new mass-radius constraints from PSR~J1614--2230, PSR~J2124--3358, and 47~Tuc~X7
AU - Melissa Mendes
AU - Isak Svensson
AU - Hannah Gottling
AU - Kai Hebeler
AU - Achim Schwenk
AU - Nathan Rutherford
AU - Lucien Mauviard
AU - Christine Kazantsev
AU - Yves Kini
AU - Denis Gonzalez-Caniulef
AU - Sebastien Guillot
AU - Anna Watts
PY - 2026
DA - 2026/09/01
PB - HAL
DO - 10.48550/arxiv.2609.00173
UR - https://hal.science/hal-05758429v1
AB - We study the impact of new mass-radius information from PSR J1614-2230, PSR J2124-3358, and 47 Tuc X7 in a combined equation of state inference based on chiral effective field theory constraints at nuclear densities and using different high-density extensions, including perturbative QCD constraints. The largest impact stems from the heavy-mass PSR J1614-2230 star, which shifts heavy neutron stars to smaller radii by around 0.4 km. Moreover, the combined astrophysical NICER, LIGO/Virgo, and X-ray information drives the radius posterior to a more data-driven distribution, which is less sensitive to the high-density extension. For the equation of state, the new mass-radius information significantly tightens the pressure and speed-of-sound posterior distributions, especially around three times saturation density. Finally, we make predictions for the poorly constrained masses of PSR J2124-3358 and 47 Tuc X7 based on the combined equation of state analysis and the other astrophysical sources.
ER -