Merging strangeon stars Ⅱ:the ejecta and light curves  

作　　者：Xiao-Yu Lai Cheng-Jun Xia) Yun-Wei Yu Ren-Xin Xu 来小禹;夏铖君;俞云伟;徐仁新(Department of Physics and Astronomy,Hubei University of Education,Wuhan 430205,China;Research Center for Astronomy,Hubei University of Education,Wuhan 430205,China;School of Information Science and Engineering,NingboTech University,Ningbo 315100,China;Institute of Astrophysics,Central China Normal University,Wuhan 430079,China;School of Physics,Peking University,Beijing 100871,China;Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China)

机构地区：[1]Department of Physics and Astronomy,Hubei University of Education,Wuhan 430205,China [2]Research Center for Astronomy,Hubei University of Education,Wuhan 430205,China [3]School of Information Science and Engineering,NingboTech University,Ningbo 315100,China [4]Institute of Astrophysics,Central China Normal University,Wuhan 430079,China [5]School of Physics,Peking University,Beijing 100871,China [6]Kavli Institute for Astronomy and Astrophysics,Peking University,Beijing 100871,China

出　　处：《Research in Astronomy and Astrophysics》2021年第10期86-96,共11页天文和天体物理学研究（英文版）

基　　金：supported by the National SKA Program of China(Grant No.2020SKA0120300);the National Key R&D Program of China(Grant No.2017YFA0402602);the National Natural Science Foundation of China(Grant Nos.U1831104,11673002,U1531243,11705163,11822302 and 11803007);the Strategic Priority Research Program of CAS(Grant No.XDB23010200);Ningbo Natural Science Foundation(Grant No.2019A610066);provided by China Scholarship Council during a visit by C.-J.X to JAEA is acknowledged。

摘　　要：The state of supranuclear matter in compact stars remains puzzling,and it is argued that pulsars could be strangeon stars.The consequences of merging double strangeon stars are worth exploring,especially in the new era of multi-messenger astronomy.To develop the"strangeon kilonova"scenario proposed in Paper I,we make a qualitative description about the evolution of ejecta and light curves for merging double strangeon stars.In the hot environment of the merger,the strangeon nuggets ejected by tidal disruption and hydrodynamical squeezing would suffer from evaporation,in which process particles,such as strangeons,neutrons and protons,are emitted.Taking into account both the evaporation of strangeon nuggets and the decay of strangeons,most of the strangeon nuggets would turn into neutrons and protons,within dozens of milliseconds after being ejected.The evaporation rates of different particles depend on temperature,and we find that the ejecta could end up with two components,with high and low opacity respectively.The high opacity component would be in the directions around the equatorial plane,and the low opacity component would be in a broad range of angular directions.The bolometric light curves show that the spin-down power of the long-lived remnant would account for the whole emission of kilonova AT2017gfo associated with GW170817,if the total ejected mass 10^(-3)M⊙.The detailed picture of merging double strangeon stars is expected to be tested by future numerical simulations.

关 键 词：dense matter equation of state pulsars:general 

分 类 号：P145.9[天文地球—天体物理]