The Radius of PSR J0740+6620 from NICER and XMM-Newton Data

Published: 2021-09-01
Venue: The Astrophysical Journal Letters, vol. 918, no. 2, pp. L28
Cited by: 1,348
Open access: Yes, bronze
DOI: 10.3847/2041-8213/ac089b

Abstract

PSR J0740+6620 has a gravitational mass of 2.08 ± 0.07 M ⊙ , which is the highest reliably determined mass of any neutron star. As a result, a measurement of its radius will provide unique insight into the properties of neutron star core matter at high densities. Here we report a radius measurement based on fits of rotating hot spot patterns to Neutron Star Interior Composition Explorer (NICER) and X-ray Multi-Mirror (XMM-Newton) X-ray observations. We find that the equatorial circumferential radius of PSR J0740+6620 is 13.7 − 1.5 + 2.6 km (68%). We apply our measurement, combined with the previous NICER mass and radius measurement of PSR J0030+0451, the masses of two other ∼2 M ⊙ pulsars, and the tidal deformability constraints from two gravitational wave events, to three different frameworks for equation-of-state modeling, and find consistent results at ∼1.5–5 times nuclear saturation density. For a given framework, when all measurements are included, the radius of a 1.4 M ⊙ neutron star is known to ±4% (68% credibility) and the radius of a 2.08 M ⊙ neutron star is known to ±5%. The full radius range that spans the ±1 σ credible intervals of all the radius estimates in the three frameworks is 12.45 ± 0.65 km for a 1.4 M ⊙ neutron star and 12.35 ± 0.75 km for a 2.08 M ⊙ neutron star.

@article{miller2021radius, title = {{The Radius of PSR J0740+6620 from NICER and XMM-Newton Data}}, author = {M. Coleman Miller and Frederick K. Lamb and Alexander J. Dittmann and Slavko Bogdanov and Zaven Arzoumanian and Keith C. Gendreau and Sébastien Guillot and Wynn C. G. Ho and James M. Lattimer and Michael Loewenstein and Sharon M. Morsink and Paul S. Ray and Michael T. Wolff and C. L. Baker and T. Cazeau and Sridhar Manthripragada and Craig B. Markwardt and Takashi Okajima and S. Pollard and Ismaël Cognard and H. Thankful Cromartie and Emmanuel Fonseca and Lucas Guillemot and Matthew T. Kerr and A. Parthasarathy and Timothy T. Pennucci and S. M. Ransom and Ingrid H. Stairs}, journal = {The Astrophysical Journal Letters}, year = {2021}, volume = {918}, number = {2}, pages = {L28}, doi = {10.3847/2041-8213/ac089b}, url = {https://doi.org/10.3847/2041-8213/ac089b} }

TY - JOUR AU - Miller, M. Coleman AU - Lamb, Frederick K. AU - Dittmann, Alexander J. AU - Bogdanov, Slavko AU - Arzoumanian, Zaven AU - Gendreau, Keith C. AU - Guillot, Sébastien AU - Ho, Wynn C. G. AU - Lattimer, James M. AU - Loewenstein, Michael AU - Morsink, Sharon M. AU - Ray, Paul S. AU - Wolff, Michael T. AU - Baker, C. L. AU - Cazeau, T. AU - Manthripragada, Sridhar AU - Markwardt, Craig B. AU - Okajima, Takashi AU - Pollard, S. AU - Cognard, Ismaël AU - Cromartie, H. Thankful AU - Fonseca, Emmanuel AU - Guillemot, Lucas AU - Kerr, Matthew T. AU - Parthasarathy, A. AU - Pennucci, Timothy T. AU - Ransom, S. M. AU - Stairs, Ingrid H. TI - The Radius of PSR J0740+6620 from NICER and XMM-Newton Data JO - The Astrophysical Journal Letters VL - 918 IS - 2 SP - L28 PY - 2021 DA - 2021/09/01 DO - 10.3847/2041-8213/ac089b UR - https://doi.org/10.3847/2041-8213/ac089b ER -

The Radius of PSR J0740+6620 from NICER and XMM-Newton Data

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The Radius of PSR J0740+6620 from NICER and XMM-Newton Data

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