세종대학교 두드림 비교과통합관리시스템

물리천문학과 콜로퀴움

‧강연 제목 :  Molecule and Dust Formation and Evolution in Supernovae 

‧연사 : SETI 연구소 노정희 박사님

‧일시 : 2024년 5월 1일 (수요일) 17:00~18:30

‧진행 방법 : 영실관 601호

‧신청 가능 대상 : 세종대학교 재학생 누구나

‧신청기간 : 4월 30일 ~ 5월 1일

‧강의 초록

The large quantities of dust observed in high-redshift galaxies raise a question about the origin of the dust when no intermediate-mass stars exist, but core-collapse SNe occur. Carbon monoxide (CO) is one of the most powerful coolants that lead to form dust.
I will present detections of CO and dust from SNe and an SN remnant (SNR) in NIR and MIR spectra using Gemini and JWST. Multiple CO detections in the Gemini NIR spectra include a few SNe IIP, SNe Ic, and SNe Ib/IIb. I will review the timescale and the
physical conditions of CO and dust from various SN types, including IIn and Ic-BL, and on diverse progenitor mass, mass-loss rate, and Ni mass. JWST NIRSpec-IFU spectra of the young SNR Cas A reveal a forest of CO fundamental bands composed of two large bumps, but more than 70 individual lines are resolved. We will discuss their temperature, density, and mixing from CO, the role of CO in determining if the dust is newly formed or pre-existing dust, and the complex, ongoing astrochemical processes of dust formation and CO evolution.