English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Binary neutron star (NS) mergers may result in remnants of supra-massive oreven stable NS, which have been supported indirectly by observed X-ray plateauof some gamma-ray bursts (GRBs) afterglow. Recently, Xue et al. (2019)discovered a X-ray transient CDF-S XT2 that is powered by a magnetar frommerger of double NS via X-ray plateau and following stepper phase. However, thedecay slope after the plateau emission is a little bit larger than thetheoretical value of spin-down in electromagnetic (EM) dominated by losing itsrotation energy. In this paper, we assume that the feature of X-ray emission iscaused by a supra-massive magnetar central engine for surviving thousands ofseconds to collapse black hole. Within this scenario, we present thecomparisons of the X-ray plateau luminosity, break time, and the parameters ofmagnetar between CDF-S XT2 and other short GRBs with internal plateau samples.By adopting the collapse time to constrain the equation of state (EOS), we findthat three EOSs (GM1, DD2, and DDME2) are consistent with the observationaldata. On the other hand, if the most released rotation energy of magnetar isdominated by GW radiation, we also constrain the upper limit of ellipticity ofNS for given EOS, and it is range in $[0.32-1.3]\times 10^{-3}$. Its GW signalcan not be detected by aLIGO or even for more sensitive Einstein Telescope inthe future.

The electromagnetic and gravitational-wave radiations of X-ray transient CDF-S XT2