PI: Giacomo Terreran, Northwestern U., email@example.com
Address: CIERA, 2145 Sheridan Road, Evanston, Illinois 60208 USA
CoI: Raffaella Margutti, Northwestern U.
CoI: Danny Milisavljevic, Purdue U.
CoI: Wen-fai Fong, Northwestern U.
CoI: Deanne Coppejans, Northwestern U.
CoI: Aprajita Hajela, Northwestern U.
Title: The turbulent end of massive stars
Abstract: Observations have recently led to the realisation that massive stars experience violent mass-loss events in the final stages before core- collapse. This erratic mass-loss, timed with stellar death, challenges long-held notions of stellar evolution. At the time of the explosion, the supernova (SN) ejecta interact with the material lost by the stellar progenitor before death. This interaction (i) produces unique spectroscopic features, (ii) allows for a more efficient conversion of shock kinetic energy into radiation, leading to more luminous SNe for a longer time; (iii) probes centuries of mass-loss history of the progenitor star, providing textit insight into the final years of a massive star. Here we propose a focused SOAR spectroscopic monitoring program, as part of our multi-wavelength investigation of SNe (radio to X-rays). We ask for 4 nights to monitor $sim10-15$ interacting SNe. In parallel, we will conduct photometric follow-up of the transients using the CT-1.3m telescope. These efforts will uniquely constrain massive star mass loss and the intrinsic nature of transients of unknown origin.With this study we will reconstruct the geometry, the density and chemical composition of the circumstellar material, shedding new light on the still unknown nature of the mass-loss events during the final stages of evolution of massive stars.
Program Type: Standard/Extragalactic
Run 2 (2018B): SOAR/Goodman -- 2n on Aug 17 2018, Sep 16 2018
Run 3 (2018B): SOAR/Goodman -- 1n on Oct 03 2018
Run 4 (2018B): SOAR/Goodman -- 1n on Jan 13 2019
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360