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The complex circumstellar environment of supernova 2023ixf
E A Zimmerman1, I Irani2, P Chen2
1Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot, Israel. erezimm@gmail.com.
Nature
|March 28, 2024
Summary
Early supernova observations using UV spectra reveal shock breakout from dense material. This finding helps understand the progenitor star and explosion environment, offering new insights into stellar evolution.
Area of Science:
- Astronomy and Astrophysics
- Stellar Evolution
- Supernova Physics
Background:
- Supernova (SN) early evolution provides insights into progenitor stars and their environments.
- Shock-breakout flares signal stellar explosions, but their interpretation is complicated by circumstellar material (CSM).
- Previous observations lacking ultraviolet (UV) data could not distinguish between heating and cooling emission, hindering the understanding of early explosion events.
Purpose of the Study:
- To analyze the early evolution of supernova SN 2023ixf using UV spectra and multiwavelength observations.
- To temporally resolve the shock emergence from a thick, heated medium.
- To determine the nature of the early explosion event and the characteristics of the progenitor's CSM.
Main Methods:
- Acquisition and analysis of UV spectra for SN 2023ixf.
- Comprehensive multiwavelength observations of the supernova.
- Derivation of a bolometric light curve to study shock breakout dynamics.
Main Results:
- UV spectra of SN 2023ixf provided crucial data on the early emission.
- The emergence of the explosion shock from a thick, heated medium was temporally resolved.
- A reliable bolometric light curve indicated shock breakout from a dense layer with a large radius, exceeding that of typical supergiants.
Conclusions:
- The study successfully characterized the early shock breakout of SN 2023ixf.
- The findings suggest the progenitor star was embedded in a significantly dense circumstellar material.
- This research advances our understanding of supernova physics and the environments of exploding stars.
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