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The masses of 18 pairs of double neutron stars and implications for their origin

Published online by Cambridge University Press:  30 December 2019

ChengMin Zhang  and
YiYan Yang
ChengMin Zhang
Affiliation:
CAS Key Lab of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China Key Lab of Radio Astronomy, Chinese Academy of Sciences, Beijing 100101, China School of Physical Science, University of Chinese Academy of Sciences, Beijing 100049, China
YiYan Yang
Affiliation:
CAS Key Lab of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China Astronomy Department, Beijing Normal University, Beijing 100875, China emails: [email protected], [email protected]
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Abstract

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For the observed 18 pairs of double neutron star (DNS) systems, we find that DNS mass distribution is very narrow and its mean value (about 1.34 solar mass) is less than the mean of all measured pulsars of about 1.4 solar mass. To interpret the special DNS mass characteristics, we analyze the DNS formation process, via the phases of HMXBs, by investigating the evolution of massive binary stars. Moreover, in DNSs, two classes of NSs are taken into account, formed by supernova (SN) and electron capture (EC), respectively, and generally the NS mass by SN is bigger than that by EC. Quantitatively, with various initial conditions of binary stars, the observed special DNS distribution can be satisfactorily explained.

Keywords

pulsardouble neutron starbinary systemmass
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 474 - 477
Copyright
© International Astronomical Union 2019 

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