[행사/세미나] [Colloquium] April 26(Wed.) Are Supernovae the Dust Producers in the Early Universe?: Infrared Observations of CO and Dust Formation in Supernovae
- 물리학과
- 조회수2716
- 2023-04-20
5. Abstract: Whether supernovae (SNe) are a significant source of dust has been a long-standing debate. The large quantities of dust observed in high-redshift galaxies raise a fundamental question as to the origin of dust in the universe since intermediate-mass stars cannot have evolved to the dust-producing phase in high-redshift galaxies. In contrast, core-collapse SNe (ccSNe) occur just several million years after their progenitor stars are born.
I will review the Spitzer and Herschel observations of a few young supernova remnants (SNRs), the correlation between SN-ejecta and dust, and the detections of cool dust. The latter results suggest SNe could be major dust factories at high-z, but the discrepancy of dust mass between early phases of SNe and young SNRs is puzzling and needs to be understood. Several Gemini observations of ccSNe in nearby galaxies will be presented to discuss dust and CO formation in SN-ejecta and SN physics of mixing, chemical abundances, ejecta-CSM interactions, and binary hypotheses.
The far-infrared polarization measurements of Cas A using SOFIA show a very high percent of polarization which constrain the shapes, sizes, and species of dust grains. Finally, I will discuss dust productivity in SNe and infer its plausible implications for dust in the early universe. Continuation of the near-infrared campaign is crucial for building dust mass function with progenitor mass, enabling us to observe with the Web telescope and prepare for extremely-large telescopes such as GMT and TMT.