What question did this study set out to answer?

The research aims to understand the interaction signatures and pre-explosion mass loss histories of Type II supernovae, particularly focusing on SN 1998S.

March 26, 2025Astronomy and AstrophysicsOpen Access

Spectropolarimetric modeling of interacting Type II supernovae. Application to early-time observations of SN 1998S

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The research aims to understand the interaction signatures and pre-explosion mass loss histories of Type II supernovae, particularly focusing on SN 1998S.
Utilized high-quality spectropolarimetric observations of SN 1998S at approximately 5 days after explosion.
Implemented a combination of radiation hydrodynamics and polarized radiative transfer models.
Adopted asymmetries based on 1D models of Type II SNe interacting with circumstellar material.
Achieved maximum polarization values of 1.0%, 1.4%, and 1.8% as CSM extent changed from 6 to 10 × 10^14 cm.
Found that polarization is independent of wavelength, with significant depolarization at line cores.
2D prolate ejecta models matched spectropolarimetric observations, supporting a polarization level of approximately 2%.

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Implication

Randomized trial observes polarization in SN 1998S, indicating insights into pre-SN mass loss histories.

Cite This Study

Dessart et al. (2025) studied this question.

synapsesocial.com/papers/6a6e8bb65d37378ac1dbf8c1 https://doi.org/10.1051/0004-6361/202452327

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Spectropolarimetric modeling of interacting Type II supernovae. Application to early-time observations of SN 1998S

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Cite This Study

Spectropolarimetric modeling of interacting Type II supernovae. Application to early-time observations of SN 1998S

Key Points

Discussion

Implication

Cite This Study

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