A Common Envelope Jets Supernova(CEJSN) Impostor Scenario for Fast Blue Optical Transients  

作　　者：Noam Soker 

机构地区：[1]Department of Physics,Technion,Haifa,3200003,Israel

出　　处：《Research in Astronomy and Astrophysics》2022年第5期87-97,共11页天文和天体物理学研究（英文版）

基　　金：supported by the Amnon Pazy Research Foundation;the Asher Space Research Fund at the Technion。

摘　　要：I propose a new scenario,the polar common envelope jets supernova(CEJSN)impostor scenario,to account for AT2018 cow-like fast blue optical transients(FBOTs).The polar CEJSN impostor scenario evolves through four main phases.(1)A red supergiant(RSG)star expands to tidally interact with a neutron star(NS)companion(or a black hole).The interaction increases the RSG mass loss rate to form a circumstellar matter(CSM)halo to r■0.1 pc.(2)Shortly before the onset of a common envelope evolution(CEE)and about a year before explosion the NS accretes mass from the RSG envelope and launches jets that inflate two opposite lobes in the CSM within≈100 au.(3)The NS-RSG system enters a CEE phase during which the system ejects most of the envelope mass in a dense equatorial outflow.(4)At the termination of the CEE the leftover envelope forms a circumbinary disk around the NS-core system.The NS accretes mass from the circumbinary disk and launches energetic jets that,when colliding with the fronts of the CSM lobes,power an FBOT event.The low mass of the jets-lobes interaction zones and their large distance,of about 100 au,from the center account for the fast transient.In the future the core collapses to form a second NS.In the far future the two NSs might merge.I suggest that FBOTs and similar fast transients are CEJSN impostors which compose a large fraction of the progenitors of NS-NS merger binaries.

关 键 词：neutron stars-supernovae-stellar jets-common envelope binary stars-transient sources 

分 类 号：P145.3[天文地球—天体物理]