Speaker: Naoto Kuriyama (n.b. slides and oral presentation will be in Japanese)

Tittle: Mass eruptions from progenitors of Type IIn/Ibn supernovae (星周物質との相互作用によって輝くIIn/Ibn 型超新星の親星における爆発的質量放出の研究)

Some massive stars experience episodic and intense mass eruptions accompanied by fluctuations in the luminosity in the late phase of stellar evolution. Mass loss rates of such eruptions are too high to be explained by stellar wind mass loss model and thus dynamical eruptions seem to contribute to the mass loss and fluctuations in the luminosity. These mass eruptions form circumstellar matter (CSM) around the star and they could play an important role in the subsequent core-collapse supernova because the interaction between SN ejecta and CSM could be the thermal source of the SN. This kind of SNe are classified as Type IIn/Ibn SNe. However, the mechanism and energy sources which trigger these pre-SN eruptions have not been fully explained. We investigate the properties of a mass eruption conducting a sudden energy injection into the stellar envelope using 1-D radiation hydrodynamical simulation code. Additionally, we recently find that the first and second mass eruptions show different features if the eruption repeats twice with an appropriate time separation, because the density structure of the stellar envelope is altered by the first eruption. This fact would be useful when we interpret observations which show multiple eruption events. In this presentation, we introduce the features of pre-SN mass eruptions from the progenitors of SNe IIn/Ibn.

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Last-modified: 2021-02-25 (木) 13:21:37 (2d)