Constraining the mass and radius of neutron stars in globular clusters

Steiner, A. W.; Heinke, C. O.; Bogdanov, S.; Li, C. K.; Ho, W. C. G.; Bahramian, A.; Han, S.

doi:10.1093/mnras/sty215

Title: Constraining the mass and radius of neutron stars in globular clusters

Journal Article · Mon Jan 29 00:00:00 EST 2018 · Monthly Notices of the Royal Astronomical Society

DOI:https://doi.org/10.1093/mnras/sty215· OSTI ID:1460181

Steiner, A. W. ^[1]; Heinke, C. O. ^[2]; Bogdanov, S. ^[3]; Li, C. K. ^[4];

^[5];

^[6]; Han, S. ^[7]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Physics Division
Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics
Columbia Univ., New York, NY (United States). Columbia Astrophysics Lab.
Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics; Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. for Particle Astrophysics. Inst. of High Energy Physics
Univ. of Southampton (United Kingdom). Mathematical Sciences, Physics & Astronomy. STAG Research Centre
Univ. of Alberta, Edmonton, AB (Canada). Dept. of Physics; Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy

In this paper, we analyse observations of eight quiescent low-mass X-ray binaries in globular clusters and combine them to determine the neutron star mass–radius curve and the equation of state of dense matter. We determine the effect that several uncertainties may have on our results, including uncertainties in the distance, the atmosphere composition, the neutron star maximum mass, the neutron star mass distribution, the possible presence of a hotspot on the neutron star surface, and the prior choice for the equation of state of dense matter. The distance uncertainty is implemented in a new Gaussian blurring method that can be directly applied to the probability distribution over mass and radius. We find that the radius of a 1.4 solar mass neutron star is most likely from 10 to 14 km and that tighter constraints are only possible with stronger assumptions about the nature of the neutron stars, the systematics of the observations, or the nature of dense matter. Finally, strong phase transitions in the equation of state are preferred, and in this case, the radius is likely smaller than 12 km. However, radii larger than 12 km are preferred if the neutron stars have uneven temperature distributions.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); Science and Technology Facilities Council (STFC) (United Kingdom)

Grant/Contract Number:: AC05-00OR22725; PHY1554876

OSTI ID:: 1460181

Journal Information:: Monthly Notices of the Royal Astronomical Society, Vol. 476, Issue 1; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 87 works

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The Distance, Mass, and Radius of the Neutron Star in 4U 1608-52 Guver, Tolga; Ozel, Feryal; Cabrera-Lavers, Antonio arXiv https://doi.org/10.48550/arxiv.0811.3979	text	January 2008
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X-ray Studies of Two Neutron Stars in 47 Tucanae: Toward Constraints on the Equation of State Heinke, C. O.; Grindlay, J. E.; Lloyd, D. A. arXiv https://doi.org/10.48550/arxiv.astro-ph/0301235	text	January 2003
Creating ultra-compact binaries in globular clusters through stable mass transfer van der Sluys, M. V.; Verbunt, F.; Pols, O. R. arXiv https://doi.org/10.48550/arxiv.astro-ph/0411189	text	January 2004
A Hydrogen Atmosphere Spectral Model Applied to the Neutron Star X7 in the Globular Cluster 47 Tucanae Heinke, Craig O.; Rybicki, George B.; Narayan, Ramesh arXiv https://doi.org/10.48550/arxiv.astro-ph/0506563	text	January 2005
On the possibility of a helium white dwarf donor in the presumed ultracompact binary 2S 0918-549 Zand, J. J. M. in 't; Cumming, A.; van der Sluys, M. V. arXiv https://doi.org/10.48550/arxiv.astro-ph/0506666	text	January 2005
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Model Atmospheres for Low Field Neutron Stars Rajagopal, Mohan; Romani, Roger arXiv https://doi.org/10.48550/arxiv.astro-ph/9510094	text	January 1995
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