Program: GN-2022A-Q-116

Title:Spectral observations of infant supernovae
PI:Chris Ashall
Co-I(s): Ben Shappee, Michael Tucker, Thomas De Jaeger, Lluis Galbany, Eric Hsiao, Max Stritzinger, scott davis, aaron do, mark huber

Abstract

High cadence non-targeted surveys(e.g. ASAS-SN, ATLAS, Pan-STARRS, and ZTF) have led to the discovery of a multitude of Supernovae (SNe)within days of explosion. Obtaining spectra of SN in these infant stages reveals the chemical composition of theouter most layers which are linked to important properties of the progenitor systems. We request 16 hours RToOon Gemini GMOS and GNIRS to obtain optical and NIR spectra of SNe within hours of discovery. For typeIa SNe these spectra will investigate the nature of the accreting material, the distribution of unburnt elementsin the ejecta, and distinguish between leading explosion models (Chandrasekhar-mass vs. sub-Chandrasekharmass). For stripped-envelope SNe, early spectra provide direct measurements of the outer structure, kinematics,and composition of their progenitor stars and put constraints on the origin of the surrounding circumstellarmaterial. For type II SN the composition of the outer layers progenitor layers will be measured

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