paper

Heavy double neutron stars: birth, mid-life and death

arXiv:2011.01495 · doi:10.3847/2041-8213/abe7f6

Abstract

Radio pulsar observations probe the lives of Galactic double neutron-star (DNS) systems while gravitational waves enable us to study extragalactic DNS in their final moments. By combining measurements from radio and gravitational-wave astronomy, we seek to gain a more complete understanding of DNS from formation to merger. We analyse the recent gravitational-wave binary neutron star mergers GW170817 and GW190425 in the context of other DNS known from radio astronomy. By employing a model for the birth and evolution of DNS, we measure the mass distribution of DNS at birth, at mid-life (in the radio), and at death (in gravitational waves). We consider the hypothesis that the high-mass gravitational-wave event GW190425 is part of a subpopulation formed through unstable case BB mass transfer, which quickly merge in . We find mild evidence to support this hypothesis and that GW190425 is not a clear outlier from the radio population as previously claimed. If there are fast-merging binaries, we estimate that they constitute of DNS at birth (90% credibility). We estimate the typical delay time between the birth and death of fast-merging binaries to be (90% credibility). We discuss the implications for radio and gravitational-wave astronomy.

16 pages, 10 figures, 3 tables

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