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29 March 2024
 
  » arxiv » 1904.6664

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X-ray transient CDF-S XT2: the electromagnetic and gravitational-wave radiations of a supra-massive neutron star
Hou-Jun Lü ; Yong Yuan ; Lin Lan ; Bin-Bin Zhang ; Jin-Hang Zou ; En-Wei Liang ;
Date 14 Apr 2019
AbstractThe merging process of binary neutron stars is the source of the quadrupole gravitational-wave (GW) radiation. Its remnant can be either a supra-massive or a stable NS. Such evidence of magnetar signature has been supported indirectly by observed X-ray plateau of some gamma-ray bursts (GRBs) afterglow. Recently, Xue et al. (2019) discovered an X-ray transient CDF-S XT2 that is claimed to be powered by a stable magnetar from the merger of double NS. In this paper, we revisit the X-ray emission of CDF-S XT2 and find that it is more consistent with a supra-massive magnetar central engine, surviving thousands of seconds to collapse black hole. We present the comparisons of the X-ray plateau luminosity, break time, and the parameters of magnetar between CDF-S XT2 and other short GRBs with internal plateau samples. By adapting the collapse time to constrain the equation of state (EOS), we find that three EOSs (GM1, DD2, and DDME2) are consistent with the observational data. On the other hand, if the most released rotation energy of magnetar is dominated by GW radiation, we also constrain the upper limit of ellipticity of NS for given EOS, and it is in a range in $[0.89-1.8] imes 10^{-3}$. Its GW signal cannot be detected by aLIGO or even for more sensitive Einstein Telescope in the future.
Source arXiv, 1904.6664
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