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- W4386655345 abstract "Some supernovae (SNe), such as Type IIn SNe, are powered by collision of the SN ejecta with a dense circumstellar matter (CSM). Their emission spectra show characteristic line shapes of combined broad emission and narrow P-Cyg lines, which should closely relate to the CSM structure and the mass-loss mechanism that creates the dense CSM. We quantitatively investigate the relationship between the line shape and the CSM structure by Monte Carlo radiative transfer simulations, considering two representative cases of dense CSM formed by steady and eruptive mass loss. Comparing the H$alpha$ emission between the two cases, we find that a narrow P-Cyg line appears in the eruptive case while it does not appear in the steady case, due to the difference in the velocity gradient in the dense CSM. We also reproduce the blue-shifted photon excess observed in some SNe IIn, which is formed by photon transport across the shock wave and find the relationship between the velocity of the shocked matter and the amount of the blue shift of the photon excess. We conclude that the presence or absence of narrow P-Cyg lines can distinguish the mass loss mechanism, and suggest high-resolution spectroscopic observations with $lambda/ Delta lambda gtrsim 10^4$ after the light curve peak for applying this diagnostic method." @default.
- W4386655345 created "2023-09-13" @default.
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- W4386655345 date "2023-09-11" @default.
- W4386655345 modified "2023-10-18" @default.
- W4386655345 title "Diagnosis of Circumstellar Matter Structure in Type IIn Supernovae with Hydrogen Line Feature" @default.
- W4386655345 doi "https://doi.org/10.48550/arxiv.2309.05344" @default.
- W4386655345 hasPublicationYear "2023" @default.
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