Rapid spectroscopic observations of newly discovered (extra-galactic) transients are currently a limiting factor in the transient science. Based on the success of two-month pilot campaign we conducted in July-August 2023, we propose rapid ToO spectroscopy within 24 hrs after the discovery of newly discovered infant supernovae (SNe) and rapidly-evolving transients, with two nights of GMOS-N (coordinated with intensive follow-up observations with 1-4m telescopes) and one night of GMOS-S (coordinated with ALMA). We will catch > 6 infant SNe (and > 3 genuinely infant SNe) and 1-2 rapidly-evolving transients, resulting in a significant increase to the literature samples. Combined with model analyses, we aim at substantially deepening our understanding on the origin of the final activity of massive stars (through infant core-collapse SN sample), the (multiple-channel) evolution of white dwarfs (WDs) toward thermonuclear SNe Ia (through infant SNe Ia). and uncovering the multiple origins of rapidly-evolving transients.
This document was translated from LATEX by HEVEA.