Abstract
Astrophysics Neutron star interiors are composed of exotic neutron-rich matter that cannot be produced in laboratories, and its properties are of interest to both astronomers and nuclear physicists. The Neutron Star Interior Composition Explorer (NICER) instrument performs precise timing of x-ray emission from fast-spinning neutron stars. Riley et al. and Miller et al. report independent blind analyses of the same NICER dataset for a single neutron star. The resulting models have some differences but lead to mass and radius measurements that are consistent within their uncertainties. Companion papers show how the NICER measurements constrain the properties of exotic neutron-rich matter. Astrophys. J. Lett. 887 , L21, L24 (2019).
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