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A radius is measured for the heaviest known neutron star

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X-ray timing of hot spots on the rotating surface of PSR J0740+6620, using NICER together with XMM-Newton data, produced the first radius measurement for a neutron star of about 2.08 solar masses. Two independent analyses of largely the same data reported equatorial radii near 12.4 km and near 13.7 km, a spread that matters because the mass-radius relation is the observational handle on the equation of state of matter at densities beyond nuclear saturation.

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Assembled from 25 blocks · 1 evidence · 19 related

  1. Story
  2. X-ray timing of hot spots on the rotating surface of PSR J0740+6620, using NICER together with XMM-Newton data, produced the first radius measurement for a neutron star of about 2.08 solar masses. Two independent analyses of largely the same data reported equatorial radii near 12.4 km and near 13.7 km, a spread that matters because the mass-radius relation is the observational handle on the equation of state of matter at densities beyond nuclear saturation.
  3. Knowledge
  4. Degeneracy pressure
  5. Neutron star
  6. A radius is measured for the heaviest known neutron star
  7. Connections
  8. Neutron star
  9. Degeneracy pressure
  10. Degeneracy pressure
  11. Supernova
  12. Baade and Zwicky propose supernovae and neutron stars
  13. A regularly pulsing radio source is identified
  14. A pulsar is found inside the Crab Nebula
  15. SN 1987A: neutrinos from a collapsing core reach Earth
  16. A neutron-star merger is detected in gravitational waves and light
  17. A radius is measured for the heaviest known neutron star
  18. JWST finds the compact object in SN 1987A
  19. Chandrasekhar limit
  20. White dwarf
  21. Neutron star
  22. A maximum mass for ideal white dwarfs is published
  23. A radius is measured for the heaviest known neutron star
  24. Evidence
  25. Provides a mass of 2.08 +/- 0.07 solar masses and radius estimates for the heaviest reliably measured neutron star. Journal, volume, page and DOI come from ADS and publisher listings via search; neither paper was fetched. The two radius values quoted in this pack (near 12.4 km and near 13.7 km) come from independent analyses reported in a search summary and are given as a disagreement rather than reconciled.
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