Are Supernovae the Dust Producers in the Early Universe?: Near-IR Campaign of CO and Dust Formation in Supernovae // The DESI Focal Plane: Joys and Complication
Friday, 01 October 2021 noon — 1 p.m. MST
Jeonghee Rho, SETI
Are Supernovae the Dust Producers in the Early Universe?: Near-IR Campaign of CO and Dust Formation in Supernovae
Whether supernovae 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 stars cannot have evolved to the AGB dust-producing phase in high-redshift galaxies. In contrast, supernovae (SNe) occur within several million years after the onset of star formation. Our Gemini near-IR observations reveal the temporal evolution of CO and dust emission in Type IIP SN2017eaw from day 100 to 530 and in Type Ic SN2020oi at day 63. CO and dust in SN-Ic appear earlier than those of SN-IIP. Non-LTE CO modeling of SN2020oi requires mixed-ejecta, and CO is optically thick, while the dust temperature from the rising continuum suggests newly formed dust in Si/S layers. I will present several other SN-IIP and SNIbc observations and discuss the critical SN physics of dust formation, mixing, chemical abundances, explosion energies, ejecta-CSM interactions, and binary hypotheses. Continuation of the NIR campaign is crucial for building the IMFs of their progenitor and dust and understanding CO and dust production in the early universe, enabling us to prepare for JWST and US ELT.
Kevin Fanning, OSU
The DESI Focal Plane: Joys and Complication
The Dark Energy Spectroscopic Instrument (DESI) is undertaking the largest redshift survey in existence. In the next few years, DESI will collect the redshifts of as many as 35 million galaxies. No small part of this incredible achievement is due to DESI's robotic focal plane system. In this talk I will give a brief overview of DESI and its science goals. I will go in depth on the focal plane and some of its technical achievements. I will then talk about some of the challenges and solutions to those challenges, the focal plane introduces in clustering analysis. This will include some classic complications DESI shares with older surveys such as eBOSS as well as newer complications due to the robotic nature of DESI's focal plane.