| The electromagnetic and gravitational-wave radiations of X-ray transient CDF-S XT2 |
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| 作者姓名： | Hou-Jun Lü Yong Yuan Lin Lan Bin-Bin Zhang Jin-Hang Zou En-Wei Liang |
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| 作者单位： | Guangxi Key Laboratory for Relativistic Astrophysics;School of Astronomy and Space Science;Key Laboratory of Modern Astronomy and Astrophysics（Nanjing University）;Space Science and Technology |
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| 基金项目： | supported by the National Natural Science Foundation of China(Grant Nos.11922301,11851304,11533003 and 11833003);the Guangxi Science Foundation(2017GXNSFFA198008,2018GXNSFGA281007 and AD17129006);support from a national program for young scholars in China;Program for Innovative Talents and Entrepreneur in Jiangsu;the National Key Research and Development Program of China(2018YFA0404204)。 |
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| 摘 要： | Binary neutron star(NS)mergers may result in remnants of supra-massive or even stable NS,which have been supported indirectly by observed X-ray plateau of some gamma-ray burst(GRB)afterglows.Recently,Xue et al.(2019)discovered an X-ray transient CDF-S XT2 that is powered by a magnetar from merger of double NS via X-ray plateau and following stepper phase.However,the decay slope after the plateau emission is slightly larger than the theoretical value of spin-down in electromagnetic(EM)dominated by losing its rotation energy.In this paper,we assume that the feature of X-ray emission is caused by a supra-massive magnetar central engine for surviving thousands of seconds to collapse into a black hole.Within this scenario,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 adopting 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 its range is0.32-1.3]×10-3.Its GW signal cannot be detected by Advanced LIGO or even for more sensitive Einstein Telescope in the future.
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| 关 键 词： | STARS MAGNETARS |
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