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  Stringent constraints on neutron-star radii from multimessenger observations and nuclear theory

Capano, C., Tews, I., Brown, S. M., Margalit, B., De, S., Kumar, S., et al. (2020). Stringent constraints on neutron-star radii from multimessenger observations and nuclear theory. Nature Astronomy. doi:10.1038/s41550-020-1014-6.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-BA46-C Version Permalink: http://hdl.handle.net/21.11116/0000-0006-0252-B
Genre: Journal Article

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Capano, Collin1, Author              
Tews, Ingo, Author
Brown, Stephanie M., Author
Margalit, Ben, Author
De, Soumi, Author
Kumar, Sumit1, Author              
Brown, Duncan A., Author
Krishnan, Badri, Author
Reddy, Sanjay, Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc,High Energy Physics - Phenomenology, hep-ph,Nuclear Theory, nucl-th
 Abstract: The properties of neutron stars are determined by the nature of the matter that they contain. These properties can be constrained by measurements of the star's size. We obtain the most stringent constraints on neutron-star radii to date by combining multimessenger observations of the binary neutron-star merger GW170817 with nuclear theory that best accounts for density-dependent uncertainties in the equation of state. We construct equations of state constrained by chiral effective field theory and marginalize over these using the gravitational-wave observations. Combining this with the electromagnetic observations of the merger remnant that imply the presence of a short-lived hyper-massive neutron star, we find that the radius of a $1.4M_\odot$ neutron star is $R_{1.4M_{\odot}} = 11.0^{+0.9}_{-0.6}~{\rm km}$ ($90\%$ credible interval). This constraint has important implications for dense-matter physics and for astrophysics.

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 Dates: 2019-08-272020
 Publication Status: Published online
 Pages: 28 pages, 3 figures
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 Rev. Type: -
 Identifiers: arXiv: 1908.10352
URI: http://arxiv.org/abs/1908.10352
DOI: 10.1038/s41550-020-1014-6
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Title: Nature Astronomy
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