A Model for the Fast Blue Optical Transient AT2018cow: Circumstellar Interaction of a Pulsational Pair-instability Supernovaстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 9 декабря 2020 г.
Аннотация:The fast blue optical transient (FBOT) ATLAS18qqn (AT2018cow) has a light curve as bright as that ofsuperluminous supernovae (SLSNe) but rises and falls much faster. We model this light curve by circumstellarinteraction of a pulsational pair-instability (PPI) supernova (SN) model based on our PPISN models studied inprevious work. We focus on the 42 Msun He star (core of a 80 Msun star) which has circumstellar matter (CSM) ofmass 0.50 Msun. With the parameterized mass cut and the kinetic energy of explosion E, we performhydrodynamical calculations of nucleosynthesis and optical light curves of PPISN models. The optical light curveof the first ∼20 days of AT2018cow is well reproduced by the shock heating of CSM for the 42 Me He star withE=5×10^51 erg. After day 20, the light curve is reproduced by the radioactive decay of 0.6 Msun 56 Co, which is a decay product of 56Ni in the explosion. We also examine how the light-curve shape depends on the various modelparameters, such as CSM structure and composition. We also discuss (1) other possible energy sources and theirconstraints, (2) the origin of the observed high-energy radiation, and (3) how our result depends on the radiativetransfer codes. Based on our successful model for AT2018cow and the model for SLSN with CSM mass as large as20 Msun, we propose the working hypothesis that PPISN produces SLSNe if the CSM is massive enough and FBOTsif CSM is less than ∼1 Msun.