GRB 210323A:Signature of Long-lasting Lifetime of Supra-massive Magnetar as the Central Engine from the Merger of Binary Neutron Star  

作　　者：Yingze Shan Xiaoxuan Liu Xing Yang Haoyu Yuan Houjun Lü 

机构地区：[1]Guangxi Key Laboratory for Relativistic Astrophysics,School of Physical Science and Technology,Guangxi University,Nanning 530004,China [2]Department of Astronomy,School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China

出　　处：《Research in Astronomy and Astrophysics》2024年第8期32-41,共10页天文和天体物理学研究（英文版）

基　　金：supported by the Guangxi Science Foundation(grant No.2023GXNSFDA026007);the Program of Bagui Scholars Program(LHJ)。

摘　　要：Theoretically,a supra-massive neutron star or magnetar may be formed after the merger of binary neutron stars.GRB210323A is a short-duration gamma-ray burst(GRB)with a duration of lasting~1 s.The light curve of the prompt emission of GRB 210323A shows a signal-peaked structure and a cutoff power-law model can adequately fit the spectra with E_p=1826±747.More interestingly,it has an extremely long-lasting plateau emission in the X-ray afterglow with a duration of~10^(4)s,and then follows a rapid decay with a decay slope~3.2.This temporal feature is challenging by invoking the external shock mode.In this paper,we suggest that the observed long-lasting X-ray plateau emission is caused by the energy injection of dipole radiation from supra-massive magnetar,and the abrupt decay following the longlasting X-ray plateau emission is explained by supra-massive magnetar collapsing into a black hole.It is the short GRB(SGRB)with the longest X-ray internal plateau emission powered by a supra-massive neutron star.If this is the case,one can estimate the physical parameters of a supra-massive magnetar,and compare with other SGRBs.We also discuss the possible gravitational-wave emission,which is powered by a supra-massive magnetar and its detectability,and the possible kilonova emission,which is powered by r-process and magnetar spin-down to compare with the observed data.

关 键 词：(stars)gamma-ray burst general-(stars)gamma-ray burst individual(GRB 210323A)-stars MAGNETARS 

分 类 号：P145.6[天文地球—天体物理]