A multi-wavelength view of PSR J0437-4715 with NICER and other missions: Radius measurements from far-ultraviolet to hard X-ray pulse profile modeling

@misc{stammler2026multiwavelength,
  title = {{A multi-wavelength view of PSR J0437-4715 with NICER and other missions: Radius measurements from far-ultraviolet to hard X-ray pulse profile modeling}},
  author = {Pierre Stammler and Sebastien Guillot and Denis González-Caniulef and Isak Svensson and Anna L. Watts and Tuomo Salmi and Yves Kini and Mariska Hoogkamer and Devarshi Choudhury and Bas Dorsman and Hannah Göttling and Kai Hebeler and Daniela Huppenkothen and Christine Kazantsev and Lucien Mauviard and Melissa Mendes and Jean-François Olive and Daniel J. Reardon and Nathan Rutherford and Achim Schwenk},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.41846},
  eprint = {2610.41846},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.41846},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - A multi-wavelength view of PSR J0437-4715 with NICER and other missions: Radius measurements from far-ultraviolet to hard X-ray pulse profile modeling
AU  - Pierre Stammler
AU  - Sebastien Guillot
AU  - Denis González-Caniulef
AU  - Isak Svensson
AU  - Anna L. Watts
AU  - Tuomo Salmi
AU  - Yves Kini
AU  - Mariska Hoogkamer
AU  - Devarshi Choudhury
AU  - Bas Dorsman
AU  - Hannah Göttling
AU  - Kai Hebeler
AU  - Daniela Huppenkothen
AU  - Christine Kazantsev
AU  - Lucien Mauviard
AU  - Melissa Mendes
AU  - Jean-François Olive
AU  - Daniel J. Reardon
AU  - Nathan Rutherford
AU  - Achim Schwenk
PY  - 2026
DA  - 2026/10/30
PB  - arXiv
DO  - 10.48550/arxiv.2610.41846
UR  - https://arxiv.org/abs/2610.41846
AB  - We report updated mass and radius measurements for the millisecond pulsar PSR J0437-4715 obtained with pulse profile modeling of the emission from the far-ultraviolet to the hard X-rays. Using an extended 2.56 Ms Neutron Star Interior Composition ExploreR (NICER) dataset together with XMM-Newton, Nuclear Spectroscopic Telescope ARray and Hubble Space Telescope observations, we perform Bayesian inference with models describing the thermal emission from hot spots of increasing complexities, together with the rest of the warm NS surface, as well as the non-thermal emission component represented by a phase-dependent (pulsed) power-law. With this comprehensive model and broadband data set, as well as radio timing priors on the mass, distance and inclination, our headline result for PSR J0437-4715 led to a mass M = 1.377(-0.034)(+0.038) Msun and an equatorial radius Req = 11.35(-0.39)(+0.40) km, one of the narrowest measurements of Req from NICER observations of millisecond pulsars. The geometric configuration favors a non-antipodal hot spot distribution, as noted in previous analyses of this pulsar. When combined with recent measurements of M and Req of other pulsars, the tight constraints from PSR J0437-4715 further reduce the allowed range of the dense matter equation of state, excluding those that predict radii above 12.0 km (at the 68% level) for all NS masses.
ER  -